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The Conversation: Out of alignment: how clashing policies make for terrible environmental outcomes

Hanna Taniukevich/Shutterstock

By Euan Ritchie (Deakin University) Catherine Lovelock (The University of Queensland) and Sarah Bekessy (RMIT University).

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Policy alignment sounds dry. But think of it like this: you want to make suburbs cooler and more liveable, so you plant large trees. But then you find the trees run afoul of fire and safety provisions, and they’re cut down.

Such problems are all too common. Policies set by different government departments start with good intentions only to clash with other policies.

At present, the Albanese government is working towards stronger environmental laws, following the scathing 2020 Samuel review of the current Environment Protection and Biodiversity Conservation Act. The review noted planning, funding and regulatory decisions are “not well integrated or clearly directed towards achieving long-term environmental sustainability”.

Stronger laws are not a standalone answer. We must find ways to align government policies far better, so progress on one front doesn’t lead to a setback elsewhere. As the government prepares to announce once in a generation changes to our main environment laws, it must find ways to reduce these clashes.

Nature vs cities

All levels of government have policies aimed at increasing canopy cover and biodiversity in cities. How hard can it be to plant trees?

The problems start when you look for places to actually plant street trees. It’s common to encounter a wall of obstacles, namely, other policies and regulations. Fire prevention, human safety, visibility for road traffic and provision of footpaths and carparks are often legally binding requirements that can stymie this seemingly simple goal.

Most cities in Australia are now actually losing canopy cover rather than gaining more.

On the biodiversity front, urban sprawl is pushing many species and ecosystems to the brink of extinction.

grassland and creeping suburbia
What should we do when threatened species protection conflicts with new housing developments? Rusty Todaro/Shutterstock

Last year, conservationists rediscovered the grassland earless dragon on Melbourne’s grassy western fringes, which we had believed was extinct. Now we had a second chance to save it, in line with the Australian government’s pledge to stop extinctions.

The problem? The grasslands where the dragon was found near Bacchus Marsh, just outside Melbourne, are zoned for housing. Only 1% of the grasslands ecosystems suitable for these reptiles is still intact, and much of it has been earmarked for housing.

From a housing point of view, the continued existence of the dragon now threatens plans for 310,000 homes.

If we had better policy alignment, we would look to achieve both goals: protect the dragon and build more housing through methods such as building sustainable midrise developments in established urban areas.

Protecting the reef while exporting LNG

Meanwhile, the Great Barrier Reef is bleaching again, the fifth bout in just eight years.

Almost all the extra heat trapped by greenhouse gases goes into our oceans, triggering marine heatwaves and bleaching. If the world’s largest living structure bleaches too much, it will begin to die, threatening its rich biodiversity, cultural heritage and industries such as tourism.

On the one hand, Australia wants to protect the reef and has funded efforts to boost water quality.

LNG carrier queensland
A LNG carrier departs the port of Gladstone, on the southern Great Barrier Reef. The cargo it carries will, when burned, trap more heat and lead to more bleaching of the reef. Ivan Kuzkin/Shutterstock

But on the other hand, supportive government policies contribute to our recent emergence as a top exporter of liquefied natural gas, which is 85–95% comprised of the potent greenhouse gas methane. Land clearing in the catchments of rivers which flow to the reef is ongoing due to policy loopholes, which adds more smothering sediment, nutrients and pollutants to the reef’s woes.

The shipping sector only has to abide by a voluntary code to avoid invasive species arriving in the ship’s bilge water, even though they could be carrying the tissue loss disease devastating reefs in the Caribbean and Florida.

Renewables versus biodiversity

Calls to fast-track clean energy projects and stop them being held up by environmental approvals are risky. We could tackle one crisis (climate change) by making another worse (biodiversity and extinction).

Australia has destroyed nearly 40% of its forests since European colonisation, with much of the remaining native vegetation highly fragmented. Because this clearing has already happened, it should be entirely possible to build renewables without damaging the homes of native species.

In fact, we can do better – we can take degraded farmland, build solar on it and restore low-lying native vegetation around it to actually boost biodiversity. Requiring new renewable projects to be nature positive would encourage creative approaches to delivering infrastructure while benefiting nature.

solar panels and wildflowers
Solar versus nature? Why not solar and nature. FenrisWolf/Shutterstock

Policy clashes abound

There is, sadly, no shortage of examples of clashing policies:

Why the lack of alignment?

For politicians, the environment ministry is often seen as a poisoned chalice.

Within government, departments often pull in different directions. When resource and agriculture plans conflict with environmental concerns, it’s not hard to guess which side tends to win. Case in point: the recent plans to remove gas project oversight from environment minister Tanya Plibersek in favour of resources minister Madeleine King.

How can we make policies work together better for the environment? Governments should sift through all relevant policies and regulations to make sure nature-positive approaches are embedded. Requiring development proposals to benefit nature would go a long way to reducing environment-economy conflict. After all, most businesses are now looking into ways of becoming nature-positive.

Too often, environment policies are seen as opposed to those promoting the economy, jobs and industry. But they don’t have to clash.

Tremendous opportunities exist for a safer, more sustainable future, if we address current causes of friction and take a big picture approach to how we develop our policies.

The Conversation

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Publications

Mammal responses to global changes in human activity vary by trophic group and landscape

Authors: A Cole Burton, Christopher Beirne, Kaitlyn M Gaynor, Catherine Sun, Alys Granados, Maximilian L Allen, Jesse M Alston, Guilherme C Alvarenga, Francisco Samuel Álvarez Calderón, Zachary Amir, Christine Anhalt-Depies, Cara Appel, Stephanny Arroyo-Arce, Guy Balme, Avi Bar-Massada, Daniele Barcelos, Evan Barr, Erika L Barthelmess, Carolina Baruzzi, Sayantani M Basak, Natalie Beenaerts, Jonathan Belmaker, Olgirda Belova, Branko Bezarević, Tori Bird, Daniel A Bogan, Neda Bogdanović, Andy Boyce, Mark Boyce, LaRoy Brandt, Jedediah F Brodie, Jarred Brooke, Jakub W Bubnicki, Francesca Cagnacci, Benjamin Scott Carr, João Carvalho, Jim Casaer, Rok Černe, Ron Chen, Emily Chow, Marcin Churski, Connor Cincotta, Duško Ćirović, T D Coates, Justin Compton, Courtney Coon, Michael V Cove, Anthony P Crupi, Simone Dal Farra, Andrea K Darracq, Miranda Davis, Kimberly Dawe, Valerie De Waele, Esther Descalzo, Tom A Diserens, Jakub Drimaj, Martin Duľa, Susan Ellis-Felege, Caroline Ellison, Alper Ertürk, Jean Fantle-Lepczyk, Jorie Favreau, Mitch Fennell, Pablo Ferreras, Francesco Ferretti, Christian Fiderer, Laura Finnegan, Jason T Fisher, M Caitlin Fisher-Reid, Elizabeth A Flaherty, Urša Fležar, Jiří Flousek, Jennifer M Foca, Adam Ford, Barbara Franzetti, Sandra Frey, Sarah Fritts, Šárka Frýbová, Brett Furnas, Brian Gerber, Hayley M Geyle, Diego G Giménez, Anthony J Giordano, Tomislav Gomercic, Matthew E Gompper, Diogo Maia Gräbin, Morgan Gray, Austin Green, Robert Hagen, Robert (Bob) Hagen, Steven Hammerich, Catharine Hanekom, Christopher Hansen, Steven Hasstedt, Mark Hebblewhite, Marco Heurich, Tim R Hofmeester, Tru Hubbard, David Jachowski, Patrick A Jansen, Kodi Jo Jaspers, Alex Jensen, Mark Jordan, Mariane C Kaizer, Marcella J Kelly, Michel T Kohl, Stephanie Kramer-Schadt, Miha Krofel, Andrea Krug, Kellie M Kuhn, Dries P J Kuijper, Erin K Kuprewicz, Josip Kusak, Miroslav Kutal, Diana J R Lafferty, Summer LaRose, Marcus Lashley, Richard Lathrop, Thomas E Lee Jr, Christopher Lepczyk, Damon B Lesmeister, Alain Licoppe, Marco Linnell, Jan Loch, Robert Long, Robert C Lonsinger, Julie Louvrier, Matthew Scott Luskin, Paula MacKay, Sean Maher, Benoît Manet, Gareth K H Mann, Andrew J Marshall, David Mason, Zara McDonald, Tracy McKay, William J McShea, Matt Mechler, Claude Miaud, Joshua J Millspaugh, Claudio M Monteza-Moreno, Dario Moreira-Arce, Kayleigh Mullen, Christopher Nagy, Robin Naidoo, Itai Namir, Carrie Nelson, Brian O’Neill, M Teague O’Mara, Valentina Oberosler, Christian Osorio, Federico Ossi, Pablo Palencia, Kimberly Pearson, Luca Pedrotti, Charles E Pekins, Mary Pendergast, Fernando F Pinho, Radim Plhal, Xochilt Pocasangre-Orellana, Melissa Price, Michael Procko, Mike D Proctor, Emiliano Esterci Ramalho, Nathan Ranc, Slaven Reljic, Katie Remine, Michael Rentz, Ronald Revord, Rafael Reyna-Hurtado, Derek Risch, Euan G Ritchie, Andrea Romero, Christopher Rota, Francesco Rovero, Helen Rowe, Christian Rutz, Marco Salvatori, Derek Sandow, Christopher M Schalk, Jenna Scherger, Jan Schipper, Daniel G Scognamillo, Çağan H Şekercioğlu, Paola Semenzato, Jennifer Sevin, Hila Shamon, Catherine Shier, Eduardo A Silva-Rodríguez, Magda Sindicic, Lucy K Smyth, Anil Soyumert, Tiffany Sprague, Colleen Cassady St Clair, Jennifer Stenglein, Philip A Stephens, Kinga Magdalena Stępniak, Michael Stevens, Cassondra Stevenson, Bálint Ternyik, Ian Thomson, Rita T Torres, Joan Tremblay, Tomas Urrutia, Jean-Pierre Vacher, Darcy Visscher, Stephen L Webb, Julian Weber, Katherine C B Weiss, Laura S Whipple, Christopher A Whittier, Jesse Whittington, Izabela Wierzbowska, Martin Wikelski, Jacque Williamson, Christopher C Wilmers, Todd Windle, Heiko U Wittmer, Yuri Zharikov, Adam Zorn, and Roland Kays

Published in: Nature Ecology and Evolution

Abstract

Wildlife must adapt to human presence to survive in the Anthropocene, so it is critical to understand species responses to humans in different contexts.

We used camera trapping as a lens to view mammal responses to changes in human activity during the COVID-19 pandemic.

Across 163 species sampled in 102 projects around the world, changes in the amount and timing of animal activity varied widely. Under higher human activity, mammals were less active in undeveloped areas but unexpectedly more active in developed areas while exhibiting greater nocturnality. Carnivores were most sensitive, showing the strongest decreases in activity and greatest increases in nocturnality.

Wildlife managers must consider how habituation and uneven sensitivity across species may cause fundamental differences in human–wildlife interactions along gradients of human influence.

Burton AC, Beirne C, Gaynor KM, Sun C, Granados A, Allen ML, Alston JM, Alvarenga GC, Calderón FSÁ, Amir Z, Anhalt-Depies C, Appel C, Arroyo-Arce S, Balme G, Bar-Massada A, Barcelos D, Barr E, Barthelmess EL, Baruzzi C, Basak SM, Beenaerts N, Belmaker J, Belova O, Bezarević B, Bird T, Bogan DA, Bogdanović N, Boyce A, Boyce M, Brandt L, Brodie JF, Brooke J, Bubnicki JW, Cagnacci F, Carr BS, Carvalho J, Casaer J, Černe R, Chen R, Chow E, Churski M, Cincotta C, Ćirović D, Coates TD, Compton J, Coon C, Cove MV, Crupi AP, Farra SD, Darracq AK, Davis M, Dawe K, De Waele V, Descalzo E, Diserens TA, Drimaj J, Duľa M, Ellis-Felege S, Ellison C, Ertürk A, Fantle-Lepczyk J, Favreau J, Fennell M, Ferreras P, Ferretti F, Fiderer C, Finnegan L, Fisher JT, Fisher-Reid MC, Flaherty EA, Fležar U, Flousek J, Foca JM, Ford A, Franzetti B, Frey S, Fritts S, Frýbová Š, Furnas B, Gerber B, Geyle HM, Giménez DG, Giordano AJ, Gomercic T, Gompper ME, Gräbin DM, Gray M, Green A, Hagen R, Hagen R, Hammerich S, Hanekom C, Hansen C, Hasstedt S, Hebblewhite M, Heurich M, Hofmeester TR, Hubbard T, Jachowski D, Jansen PA, Jaspers KJ, Jensen A, Jordan M, Kaizer MC, Kelly MJ, Kohl MT, Kramer-Schadt S, Krofel M, Krug A, Kuhn KM, Kuijper DPJ, Kuprewicz EK, Kusak J, Kutal M, Lafferty DJR, LaRose S, Lashley M, Lathrop R, Lee TE Jr, Lepczyk C, Lesmeister DB, Licoppe A, Linnell M, Loch J, Long R, Lonsinger RC, Louvrier J, Luskin MS, MacKay P, Maher S, Manet B, Mann GKH, Marshall AJ, Mason D, McDonald Z, McKay T, McShea WJ, Mechler M, Miaud C, Millspaugh JJ, Monteza-Moreno CM, Moreira-Arce D, Mullen K, Nagy C, Naidoo R, Namir I, Nelson C, O’Neill B, O’Mara MT, Oberosler V, Osorio C, Ossi F, Palencia P, Pearson K, Pedrotti L, Pekins CE, Pendergast M, Pinho FF, Plhal R, Pocasangre-Orellana X, Price M, Procko M, Proctor MD, Ramalho EE, Ranc N, Reljic S, Remine K, Rentz M, Revord R, Reyna-Hurtado R, Risch D, Ritchie EG, Romero A, Rota C, Rovero F, Rowe H, Rutz C, Salvatori M, Sandow D, Schalk CM, Scherger J, Schipper J, Scognamillo DG, Şekercioğlu ÇH, Semenzato P, Sevin J, Shamon H, Shier C, Silva-Rodríguez EA, Sindicic M, Smyth LK, Soyumert A, Sprague T, St. Clair CC, Stenglein J, Stephens PA, Stępniak KM, Stevens M, Stevenson C, Ternyik B, Thomson I, Torres RT, Tremblay J, Urrutia T, Vacher J-P, Visscher D, Webb SL, Weber J, Weiss KCB, Whipple LS, Whittier CA, Whittington J, Wierzbowska I, Wikelski M, Williamson J, Wilmers CC, Windle T, Wittmer HU, Zharikov Y, Zorn A, Kays R (2024) Mammal responses to global changes in human activity vary by trophic group and landscape. Nature Ecology and Evolution PDF DOI 

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Science communication The Conversation

The Conversation: Why move species to islands? Saving wildlife as the world changes means taking calculated risks

Eastern Barred Bandicoot (Perameles gunnii), John Gould 1863

By Anthony Rendall (Deakin University), Amy Coetsee (The University of Melbourne), Aviya Naccarella (Deakin University) and Euan Ritchie (Deakin University).

This article is republished from The Conversation under a Creative Commons license. Read the original article.

The eastern barred bandicoot was once found in abundance across the basalt plains of western Victoria. But habitat destruction and predation by introduced red foxes drove the species to the brink of extinction on the mainland.

Establishing populations in fenced reserves was critical in providing insurance against extinction. To further increase bandicoot numbers to provide long-term security against extinction, we needed more fox-free land.

A bold plan was hatched: move the species to where the predators weren’t. Introduce them to Victoria’s fox-free Phillip and French islands.

Six years later, the bandicoot made conservation history, as the first species in Australia to be reclassified from extinct in the wild to endangered.

Why don’t we translocate all endangered species to islands? The technique can be effective, but can come with unwanted consequences.

The surprising benefits of translocation

Eastern barred bandicoots are ecosystem engineers. As they dig for their dinner of worms, beetles, bulbs, fungi and other foods, their industrious work improves soil quality, and in turn, the health of vegetation.

So when we translocate threatened species, we can get a double win – a rapid increase in their populations and restoration of lost ecosystem functions.

Australia’s landscapes look very different than they did before European colonisation around 230 years ago.

Industrialised farming, introduced predators and habitat destruction and fragmentation are driving biodiversity decline and extinctions. As species die out, ecosystems lose the vital functions wildlife perform. Without them, ecosystems might not operate as well or even collapse – a little like a poorly serviced car engine.

We feel the loss most acutely when we lose keystone species on which many other species depend, such as oysters and bees. Restoring these functions can improve biodiversity and the sustainability of food production. For instance, encouraging owls to return to farmland can cut the use of damaging rodent poisons, as owls eat thousands of mice and rats yearly.

Before colonisation, industrious digging mammals and their soil excavations were extremely widespread. Regrettably, introduced foxes and cats have made short work of many of Australia’s diggers. Six of 29 digging species are now extinct, including the lesser bilby, pig-footed bandicoot and desert rat-kangaroo. Many others are endangered.

Could translocation save more species?

Conservationists have successfully translocated species such as the western swamp tortoise, the Shark Bay mouse, and northern quolls.

The northern quoll is the smallest of Australia’s four quoll species. John Webb/AAP

New environments don’t necessarily need to be predator-free. The eastern barred bandicoot is thriving on Phillip and French Island, in the presence of feral and domestic cats. The key is there are no foxes.

Many islands are now being thought of as conservation arks, able to provide safe havens for several threatened species at once. Dirk Hartog Island, Western Australia’s largest, is now home to reintroduced western quolls, dibblers, mulgaras and other small mammals, as well as two translocated hare-wallaby species.

Why is translocation not more common?

The technique can work very well – but it can also backfire.

In the 1920s, conservationists undertook the first translocation in Australia by moving koalas to Phillip and French Island – the same Victorian islands now a refuge for bandicoots. While this protected koalas from hunting pressure, koala populations exploded, and the tree-dwelling marsupials ate themselves out of house and home in some areas.

In 2012, conservationists began introducing Tasmanian devils to Maria Island, just off Tasmania’s east coast. They wanted to conserve a healthy population free from the contagious facial tumour which has devastated their populations. On Maria Island, the devils became too successful, wiping out the island’s penguin and shearwater populations.

You can see translocations aren’t a silver bullet. We have to carefully consider the pros and cons of any such conservation intervention. Ecosystems are complex. It’s not easy to predict what will happen to an ecosystem if we introduce a species new to the area.

The decision to translocate a species is a value judgement – it prioritises one species over the broader ecosystem. Opponents of translocation question whether we are doing the right thing in valuing efforts to conserve a single species over the innate value of the existing ecosystem.

What’s the best approach in future?

Translocation is not the end goal. Islands cannot support the vast array of threatened species in Australia.

The end goal is to establish and expand threatened species populations on the mainland in fenced reserves before eventually reintroducing them to the wild where they will encounter introduced predators.

Making sure foxes don’t repopulate Phillip Island takes constant surveillance. This photo shows a fox which evaded capture for two months in 2022. Phillip Island Nature Parks/AAP

Research is being done to explore how we can make this work, such as:

1) Predator-savvy wildlife: some native species may be able to adapt to living alongside introduced predators – with some help. For example, conservationists have exposed semi-captive bilbies to small numbers of feral cats with the aim of increasing their wariness and ultimately boosting their chances of survival. Results have been encouraging.

2) Building ecosystem resilience: we know more intact native ecosystems can reduce the chance of damage from invasive species . That means re-establishing native ecosystems could boost their resilience.

Moving a species from its home is a bold and risky decision. It’s critical local communities and First Nations groups are consulted and able to guide discussions and any eventual actions.

For their part, governments, land managers and conservationists must think more broadly about how we might best conserve species and ecosystems in a rapidly changing world.

Categories
Publications

Extreme drought impacts have been underestimated in grasslands and shrublands globally

Published in: Proceedings of the National Academy of Sciences of the United States of America

Authors: Melinda D Smith, Kate D Wilkins, Martin C Holdrege, Peter Wilfahrt, Scott L Collins, Alan K Knapp, Osvaldo E Sala, Jeffrey S Dukes, Richard P Phillips, Laura Yahdjian, Laureano A Gherardi, Timothy Ohlert, Claus Beier, Lauchlan H Fraser, Anke Jentsch, Michael E Loik, Fernando T Maestre, Sally A Power, Qiang Yu, Andrew J Felton, Seth M Munson, Yiqi Luo, Hamed Abdoli, Mehdi Abedi, Concepción L Alados, Juan Alberti, Moshe Alon, Hui An, Brian Anacker, Maggie Anderson, Harald Auge, Seton Bachle, Khadijeh Bahalkeh, Michael Bahn, Amgaa Batbaatar, Taryn Bauerle, Karen H Beard, Kai Behn, Ilka Beil, Lucio Biancari, Irmgard Blindow, Viviana Florencia Bondaruk, Elizabeth T Borer, Edward W Bork, Carlos Martin Bruschetti, Kerry M Byrne, James F Cahill Jr, Dianela A Calvo, Michele Carbognani, Augusto Cardoni, Cameron N Carlyle, Miguel Castillo-Garcia, Scott X Chang, Jeff Chieppa, Marcus V Cianciaruso, Ofer Cohen, Amanda L Cordeiro, Daniela F Cusack, Sven Dahlke, Pedro Daleo, Carla M D’Antonio, Lee H Dietterich, Tim S Doherty, Maren Dubbert, Anne Ebeling, Nico Eisenhauer, Felícia M Fischer, T’ai G W Forte, Tobias Gebauer, Beatriz Gozalo, Aaron C Greenville, Karlo G Guidoni-Martins, Heather J Hannusch, Siri Vatsø Haugum, Yann Hautier, Mariet Hefting, Hugh A L Henry, Daniela Hoss, Johannes Ingrisch, Oscar Iribarne, Forest Isbell, Yari Johnson, Samuel Jordan, Eugene F Kelly, Kaitlin Kimmel, Juergen Kreyling, György Kröel-Dulay, Alicia Kröpfl, Angelika Kübert, Andrew Kulmatiski, Eric G Lamb, Klaus Steenberg Larsen, Julie Larson, Jason Lawson, Cintia V Leder, Anja Linstädter, Jielin Liu, Shirong Liu, Alexandra G Lodge, Grisel Longo, Alejandro Loydi, Junwei Luan, Frederick Curtis Lubbe, Craig Macfarlane, Kathleen Mackie-Haas, Andrey V Malyshev, Adrián Maturano-Ruiz, Thomas Merchant, Daniel B Metcalfe, Akira S Mori, Edwin Mudongo, Gregory S Newman, Uffe N Nielsen, Dale Nimmo, Yujie Niu, Paola Nobre, Rory C O’Connor, Romà Ogaya, Gastón R Oñatibia, Ildikó Orbán, Brooke Osborne, Rafael Otfinowski, Meelis Pärtel, Josep Penuelas, Pablo L Peri, Guadalupe Peter, Alessandro Petraglia, Catherine Picon-Cochard, Valério D Pillar, Juan Manuel Piñeiro-Guerra, Laura W Ploughe, Robert M Plowes, Cristy Portales-Reyes, Suzanne M Prober, Yolanda Pueyo, Sasha C Reed, Euan G Ritchie, Dana Aylén Rodríguez, William E Rogers, Christiane Roscher, Ana M Sánchez, Bráulio A Santos, María Cecilia Scarfó, Eric W Seabloom, Baoku Shi, Lara Souza, Andreas Stampfli, Rachel J Standish, Marcelo Sternberg, Wei Sun, Marie Sünnemann, Michelle Tedder, Pål Thorvaldsen, Dashuan Tian, Katja Tielbörger, Alejandro Valdecantos, Liesbeth van den Brink, Vigdis Vandvik, Mathew R Vankoughnett, Liv Guri Velle, Changhui Wang, Yi Wang, Glenda M Wardle, Christiane Werner, Cunzheng Wei, Georg Wiehl, Jennifer L Williams, Amelia A Wolf, Michaela Zeiter, Fawei Zhang, Juntao Zhu, Ning Zong, and Xiaoan Zuo

Significance

Drought has well-documented societal and economic consequences. Climate change is expected to intensify drought to even more extreme levels, but because such droughts have been historically rare, their impact on ecosystem functioning is not well known.

We experimentally imposed the most frequent type of intensified drought—one that is ~1 y in duration—at 100 grassland and shrubland sites distributed across six continents.

We found that loss of aboveground plant growth, a key measure of ecosystem function, was 60% greater when short-term drought was extreme (≤1-in-100-y historical occurrence).

This drought-induced loss in function greatly exceeds previously reported losses for grasslands and shrublands, suggesting that the global impacts of projected increases in drought severity have been substantially underestimated.

Abstract

Climate change is increasing the frequency and severity of short-term (~1 y) drought events—the most common duration of drought—globally. Yet the impact of this intensification of drought on ecosystem functioning remains poorly resolved. This is due in part to the widely disparate approaches ecologists have employed to study drought, variation in the severity and duration of drought studied, and differences among ecosystems in vegetation, edaphic and climatic attributes that can mediate drought impacts.

To overcome these problems and better identify the factors that modulate drought responses, we used a coordinated distributed experiment to quantify the impact of short-term drought on grassland and shrubland ecosystems. With a standardized approach, we imposed ~a single year of drought at 100 sites on six continents.

Here we show that loss of a foundational ecosystem function—aboveground net primary production (ANPP)—was 60% greater at sites that experienced statistically extreme drought (1-in-100-y event) vs. those sites where drought was nominal (historically more common) in magnitude (35% vs. 21%, respectively).

This reduction in a key carbon cycle process with a single year of extreme drought greatly exceeds previously reported losses for grasslands and shrublands. Our global experiment also revealed high variability in drought response but that relative reductions in ANPP were greater in drier ecosystems and those with fewer plant species.

Overall, our results demonstrate with unprecedented rigor that the global impacts of projected increases in drought severity have been significantly underestimated and that drier and less diverse sites are likely to be most vulnerable to extreme drought.

Smith MD, Wilkins KD, Holdrege MC, Wilfahrt P, Collins SL, Knapp AK, Sala OE, Dukes JS, Phillips RP, Yahdjian L, Gherardi LA, Ohlert T, Beier C, Fraser LH, Jentsch A, Loik ME, Maestre FT, Power SA, Yu Q, Felton AJ, Munson SM, Luo Y, Abdoli H, Abedi M, Alados CL, Alberti J, Alon M, An H, Anacker B, Anderson M, Auge H, Bachle S, Bahalkeh K, Bahn M, Batbaatar A, Bauerle T, Beard KH, Behn K, Beil I, Biancari L, Blindow I, Bondaruk VF, Borer ET, Bork EW, Bruschetti CM, Byrne KM, Cahill JF Jr, Calvo DA, Carbognani M, Cardoni A, Carlyle CN, Castillo-Garcia M, Chang SX, Chieppa J, Cianciaruso MV, Cohen O, Cordeiro AL, Cusack DF, Dahlke S, Daleo P, D’Antonio CM, Dietterich LH, S Doherty T, Dubbert M, Ebeling A, Eisenhauer N, Fischer FM, Forte TGW, Gebauer T, Gozalo B, Greenville AC, Guidoni-Martins KG, Hannusch HJ, Vatsø Haugum S, Hautier Y, Hefting M, Henry HAL, Hoss D, Ingrisch J, Iribarne O, Isbell F, Johnson Y, Jordan S, Kelly EF, Kimmel K, Kreyling J, Kröel-Dulay G, Kröpfl A, Kübert A, Kulmatiski A, Lamb EG, Larsen KS, Larson J, Lawson J, Leder CV, Linstädter A, Liu J, Liu S, Lodge AG, Longo G, Loydi A, Luan J, Curtis Lubbe F, Macfarlane C, Mackie-Haas K, Malyshev AV, Maturano-Ruiz A, Merchant T, Metcalfe DB, Mori AS, Mudongo E, Newman GS, Nielsen UN, Nimmo D, Niu Y, Nobre P, O’Connor RC, Ogaya R, Oñatibia GR, Orbán I, Osborne B, Otfinowski R, Pärtel M, Penuelas J, Peri PL, Peter G, Petraglia A, Picon-Cochard C, Pillar VD, Piñeiro-Guerra JM, Ploughe LW, Plowes RM, Portales-Reyes C, Prober SM, Pueyo Y, Reed SC, Ritchie EG, Rodríguez DA, Rogers WE, Roscher C, Sánchez AM, Santos BA, Cecilia Scarfó M, Seabloom EW, Shi B, Souza L, Stampfli A, Standish RJ, Sternberg M, Sun W, Sünnemann M, Tedder M, Thorvaldsen P, Tian D, Tielbörger K, Valdecantos A, van den Brink L, Vandvik V, Vankoughnett MR, Guri Velle L, Wang C, Wang Y, Wardle GM, Werner C, Wei C, Wiehl G, Williams JL, Wolf AA, Zeiter M, Zhang F, Zhu J, Zong N, Zuo X (2024) Extreme drought impacts have been underestimated in grasslands and shrublands globally. Proceedings of the National Academy of Sciences of the United States of America PDF DOI

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Science communication The Conversation

The Conversation: ‘The boss of Country’, not wild dogs to kill: living with dingoes can unite communities

Image credit: Angus Emmott

By Euan Ritchie (Deakin University), Bradley Smith, (CQUniversity Australia), Kylie M Cairns (UNSW Sydney), Sonya Takau (Indigenous Knowledge), and Whitney Rassip (Indigenous Knowledge).

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Aside from humans, dingoes are Australia’s largest land-based predator. They are arguably our most maligned, misunderstood, and mismanaged native species.

But evidence suggests this iconic canine helps maintain healthy ecosystems. They’re also a tourist draw-card. And they hold deep values for First Nations peoples.

Since colonisation, Australian governments and land managers have trapped, shot, poisoned and excluded dingoes from large parts of their Country. Policy and practices have frequently overlooked First Nations’ perspectives.

It doesn’t have to be this way. We can hear the diverse voices and values of First Nations peoples, livestock producers, ecologists, and others as we shape future policy and practices. By collaborating and drawing from both Indigenous and Western knowledge, we can find ways to live in harmony with our apex predator.

A photograph showing a kangaroo looking at two resting dingoes
Dingoes keep kangaroo numbers in check, benefiting vegetation, other wildlife, and livestock graziers. Angus Emmott

How are dingoes currently treated?

Under federal environmental law, any species present in Australia before AD 1400, such as the dingo, is classified as native. However, dingoes are not listed nationally as a threatened species. So individual state governments make their own decisions about how to treat them.

In the Northern Territory, Queensland and Victoria, dingoes are managed as protected wildlife in National Parks and conservation areas but they’re unprotected on private land.

In Western Australia, South Australia, the Australian Capital Territory and New South Wales, dingoes are unprotected wildlife. That means they are afforded no protection, even in conservation areas.

But state governments also list “wild dogs” as a priority pest species. That allows – even requires – them to be killed on public and private land.

Some states, such as Victoria, have “wild dog” bounties where landholders can turn in wild dog (but more likely dingo) body parts for money.

The state definitions of “wild dogs” includes dingoes and dingo-dog hybrids. This is based on the mistaken belief that interbreeding between dingoes and dogs was widespread across Australia.

But recent DNA research shows dingo-dog hybrids are rare. Most wild dingoes have little to no dog ancestry. This has led scientists, conservationists, and First Nations peoples to call on state governments to change dingo policies.

A photograph showing two dead dingos hanging from the branches of a tree in an agricultural landscape
Macabre scenes such as this are not uncommon across rural Australia. Angus Emmott

Stark contrasts in dingo management

Stretching more than 5,600km across Australia, the dingo barrier fence is the longest continuous artificial environmental barrier in the world. It was designed to keep dingoes out of the more productive sheep grazing areas in southeastern Australia.

In South Australia, dingoes south of the “dingo fence” are declared “wild dogs” and subject to an eradication policy. North of the “dingo fence” they are unprotected wildlife.

In contrast, dingoes are listed as threatened throughout Victoria. They are protected on public land (if more than 3 km from a private land boundary).

The existence of an isolated and threatened “Big Desert” wilkerr (dingo) population on the border between these two states highlights their differing approaches.

While the Victorian population is partially protected in the Big Desert-Wyperfeld conservation reserve complex, the South Australian wilkerr population is poisoned four times a year inside Ngarkat Conservation Area.

Photograph of a handmade sign below the road sign to Clifton that reads 'These sheep-killing mongrels are destroying the wool industry'. Someone crossed out the words 'sheep' and 'wool industry', replaced with 'dingo' and 'ecosystems'
Dingoes are regarded as pests by some and ecologically essential by others. Angus Emmott

What do dingoes mean to First Nations peoples?

Dingoes hold strong cultural significance for First Nations peoples across Australia. They are considered loved and respected family members that have always been by their sides. A healthy dingo population is seen as essential for healthy Country and healthy people.

Despite the harms of colonisation on dingoes and First Nations, Indigenous people continue to feel and nurture this connection to dingoes. Maintaining their culture means fulfilling the general cultural obligation and rights of First Nations peoples to protect this sacred animal.

This was reinforced at the National Inaugural First Nations Dingo Forum in Cairns last month (September 15–16). The forum produced a powerful statement signed by more than 20 Nations.

The national dingo declaration is clear: First Nations peoples want an immediate end to the “genocide” (deliberate killing) of dingoes on Country. Lethal control of dingoes is not acceptable, nor justified.

We join the call for an end to the use of the term “wild dog”, because it’s misleading and disrespectful. Pure dingoes, not feral or hybrid wild dogs, are predominately being killed.

First Nations people want to see the dingo reinstated as “the boss of Country”. They call on governments at all levels to involve First Nations peoples in decisions relating to dingo management, to implement and support educational programs across a variety of platforms and organisations, and to see dingoes protected under legislation.

The recent Victorian decision to maintain lethal control of dingo populations against the wishes of First Nations peoples is extremely disappointing.

Non-lethal ways to protect livestock

While lethal methods have historically been used to protect livestock from dingoes, there is growing awareness of their limitations.

Firstly, these methods have not been consistently effective in eliminating livestock losses. In some cases they have exacerbated the problem, possibly due to killing and loss of older individuals, which can change the social cohesion of dingo populations, breeding, their movements and how territorial they are. It may also alter how successful they are at hunting kangaroos, causing more attacks on livestock.

Secondly, they have been associated with adverse consequences for biodiversity. In some cases, having dingoes around can be beneficial for graziers by reducing the total grazing pressure of kangaroos, feral goats, and other herbivores, and in some cases the impacts of feral pigs too. Increasing numbers of landholders are recognising this.

Lastly, there is growing consensus these lethal approaches are not aligned with the values of the general public, particularly First Nations peoples.

A photograph of a lone dingo standing side-on in a dry grassland
Healthy Country and people requires dingoes. Angus Emmott

Non-lethal approaches to managing dingoes are gaining prominence as they are more environmentally sustainable and compassionate. These approaches prioritise coexistence by reducing conflict between dingoes and human interests while allowing dingoes to persist in landscapes.

One of the most promising non-lethal methods involves guardian animals, such as livestock-guarding dogs, llamas, and donkeys. These guardian animals establish protective bonds with livestock and effectively deter dingoes from approaching, reducing livestock losses for graziers.

Additionally, there is growing interest in developing innovative dingo deterrents, such as electric fencing and devices that emit loud noises, smells or visual stimuli, to discourage interaction between livestock and dingoes.

Initiatives promoting best practices for animal husbandry, including secure fencing, corralling, shepherding, and reducing access to resources (such as water and carcasses), play a crucial role in diminishing the attractiveness of livestock as prey to dingoes.

Working and walking together

By promoting coexistence and exploring and investing in innovative non-lethal solutions, we can strike a balance between safeguarding human interests, preserving the vital ecological role that dingoes perform, and respecting First Nations’ culture. In doing so, it is our hope that communities will be more united than divided.

We would like to acknowledge retired graziers Angus and Karen Emmott and family from far North Queensland. Their personal story about dingoes at Noonbah Station in Queensland’s Channel Country helped inform our article, and we consider Angus a co-author.The Conversation

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Categories
Science communication

Letter to Victorian ministers: Public policy in Victoria regarding dingoes

To:

The Hon Ingrid Stitt
Minister for Environment Victoria

The Hon Gayle Tierney
Minister for Agriculture,Victoria

The Hon Sonya Kilkenny
Minister for Outdoor Recreation Victoria

The Hon Jaclyn Symes
Attorney General of Victoria

CC:

Dr Fiona Fraser
Threatened Species Commissioner, Australia

Re: Public policy in Victoria regarding dingoes

Dear Minister/s,

The undersigned wish to provide expert opinion concerning recent scientific advances in our understanding of the identity and ancestry of dingoes and the implications this has for public policy relating to ‘wild dogs’ and dingoes in Victoria.

We urge the Victorian Government to:

  • Revoke (and not renew) the Order in Council unprotecting dingoes on private land and on publicland within 3 km of private land boundaries (Ecosystem Decline Inquiry recommendation 28) which is contrary to the listing of dingoes as a threatened species in Victoria. It is significant that when the Victorian Scientific Advisory Committee recommended the listing of the dingo as a threatened taxon, under the Flora and Fauna Guarantee Act in 2007, they identified that “…wild dog control programs, (including baiting and other control measures) …” have the potential to result in a “decline of remnant dingo populations and recruitment to those populations”. Dingoes should be protected on all public land.
  • Adopt recommendations 8 and 28 of the Victorian Inquiry into Ecosystem Decline to:
    • Trial the reintroduction (or re-establishment) of dingoes as apex predators into suitable Victorian ecosystems. This would be consistent with the Victorian Labor 2018 Policy Platform, which committed to “…identify and recognise the ecological function of dingoes as part of biodiversity programs and management initiatives…”.
    • Revise fund and implement the threatened species Dingo Action Statement (no. 248).
  • Update terminology in Victorian policy to refer to dingoes versus feral dogs to reflect the identity of wild canines accurately and transparently in Victoria.
  • Grant wildlife status to dingo backcrosses. Animals with predominately dingo DNA hold conservation and cultural value. The characterisation of dingo backcrosses as ‘wild dogs’ is not evidence based. Granting wildlife status to dingo backcrosses is consistent with the Victorian Labor 2022 Policy Platform, which commits to the protection of “… native apex land predator populations (Canis dingo) in Victorian ecosystems including through recognition of dingo dominant hybrids as wildlife…”.

These changes in Victorian policy are justified based on genetic research by Cairns et al. (2023) that demonstrates:

  1. Nearly all of the “wild dogs” DNA tested in Victoria were dingoes with no evidence of dog ancestry. Most of the remaining animals carried more than 93% dingo ancestry. No first- cross dingo-dog hybrids or feral dogs were found in the study. Previous genetic surveys of ‘wild dogs’ also found that first-cross hybrids and feral dogs were extremely rare in Australia.
  2. Previous DNA testing methods misidentified pure dingoes as being mixed. All previous genetic surveys of wild dingo populations have used a low resolution 23-marker DNA test. This now outdated method is still used by NSW DPI, which DNA tests samples from AgVIC, Arthur Rylah Institute and other state government agencies. Comparisons between the advanced DNA testing method and the outdated 23-marker DNA test, found that the latter frequently misidentified animals as carrying dog ancestry when they did not. Therefore, the existing departmental understanding of dingo ancestry across Victoria is incorrect; policy needs to be based on updated genetic surveys.
  3. There are multiple dingo populations in Australia. High-density genomic data identified more than four wild dingo populations in Australia. In Victoria there are at least two dingo populations present: South and Big Desert. The South dingo population was observed in eastern Victoria whilst the Big Desert population was found in western Victoria around Big Desert and Wyperfield and extends into Ngarkat Conservation Area in South Australia.
  4. Dingo populations in Victoria are challenged by low genetic variability. Preliminary evidence from high density genomic testing of dingoes in western and eastern Victoria found evidence of limited genetic variability, which could be a serious conservation concern. Dingoes in western Victoria, in particular, had extremely low levels of genetic variability and no evidence of gene flow with other dingo populations demonstrating their effective isolation. This preliminary evidence suggests that the western Victoria (Big Desert) dingo population is especially threatened by inbreeding and genetic isolation. Additional information is urgently needed on the genetic health of Victorian dingo populations to develop an evidence-based dingo conservation policy. Continued lethal control of Victorian dingo populations could exacerbate the low levels of genetic variability and further challenge the survival of these populations.

It is important to emphasise the importance of dingoes in Victorian ecosystems. Dingoes are the sole non-human land-based top predator on the Australian mainland. Their importance to the ecological health and resilience of Australian ecosystems cannot be overstated, from regulating wild herbivore abundance (e.g. various kangaroo species), to reducing the impacts of feral mesopredators (cats, foxes) on native marsupials (Johnson & VanDerWal 2009; Wallach et al. 2010; Brook et al. 2012; Letnic et al. 2012; Letnic et al. 2013; Davis et al. 2015; Newsome et al. 2015; Morris & Letnic 2017; Geary et al. 2018; Thompson et al. 2022). Current Victorian public policy concerning dingoes effectively ignores this ecological reality.

Over the past two decades, ecological research in Australian ecosystems, and elsewhere in the world, has increasingly demonstrated the importance of conserving medium to large-sized predators for ecosystem health and the preservation of biodiversity. Diminishing predator populations tend to be associated with ecosystem instability and native species decline. The extinction of a diverse suite of large carnivorous marsupials thousands of years ago (and the more recent local and functional extinctions of quoll species across much of Australia) has already simplified the structure of wildlife communities in Australia. The dingo is a keystone species that benefits small animals and plant communities by suppressing and changing the behaviours of mammalian herbivores and smaller predators (including introduced foxes and feral cats) (Johnson & VanDerWal 2009; Wallach et al. 2010; Brook et al. 2012; Letnic et al. 2012; Letnic et al. 2013; Davis et al. 2015; Newsome et al. 2015; Morris & Letnic 2017; Geary et al. 2018; Thompson et al. 2022). Their presence adds a stabilising influence and provides ecosystem resilience for species only found in Australia.

Dingoes are listed as Threatened under the Flora and Fauna Guarantee Act 1988 (Victoria) and are protected wildlife under the Wildlife Act 1975 (Victoria). However, under an Order by Council renewed on 18 September 2018, dingoes are unprotected on all private land in Victoria, and public land within 3 km of any private land boundary, within certain areas of the state. Even so, lethal control extends far beyond 3 kms in some areas, especially considering that 1080 fox baits are lethal to dingoes. We underline the need for significantly improved protection of dingoes within Victorian ecosystems. Dingoes are threatened by low genetic variability, habitat loss, increased frequency and intensity of bushfires and ongoing lethal control programs, which breaks down pack structure and may increase the risk of hybridisation with domestic dogs.

We also wish to clarify that the terminology ‘wild dog’ is not appropriate when discussing wild canids in Victoria, or more generally in Australia. In Victoria, Cairns et al. 2023 have shown that of their Victorian DNA tested samples nearly 90% were dingoes with no evidence of dog ancestry. Furthermore, the few dingoes found to be carrying dog ancestry all had more than 85% dingo DNA. Continued use of the terminology ‘wild dog’ is misleading and promotes confusion regarding the use of lethal control to target a threatened native predator in Victoria. Additionally, use of the term ‘wild dog’ fails to acknowledge and respect the value dingoes hold for many First Nations people in Victoria.

Existing Victorian Government policy is incompatible with the conservation of dingoes and their ecological function and in conflict with their listing as a threatened species.

In this context, we strongly emphasise the following points:

  • The negative ecological consequences of lethal control of dingoes could seriously harm the biodiversity, resilience and health of Victoria’s ecosystems.
  • Non-lethal forms of farm stock protection (e.g. the use of guardian dogs and strategic fencing) have not been adequately supported and trialled as an alternative to lethal control. Alternative methods like the use of livestock guardian dogs have provenhighly successful overseas and where trialled in Australia, see van Bommel and Johnson (2012, 2023). Other measures include improved livestock fencing, husbandry, adopt predator smart deterrents and protection measures on private land should be the primary aim of policy (Boronyak et al. 2023). Funds currently spent on dingo control should be allocated to investment in non-lethal management strategies and training for primary producers.
  • Continued lethal control of dingoes is likely to facilitate increases in mesopredator (cat and fox) and herbivore (kangaroos, wallabies, feral goats, and potentially deer) populations that are currently managed as pests. This will in turn threaten livestock production through the spread of disease by cats (e.g. toxoplasmosis, which can cause abortion in livestock), increased fox populations (which pose a significant risk to lambs), overgrazing by non-stock animals (e.g. kangaroos), and suppress populations of native, threatened species.
  • The extent and intensity of lethal control are disproportionate to the relatively small scale of the threat dingoes pose to farm stock in Victoria. Landholders should be supported to seek new measures ofstock protection including electric fencing, livestock guardian animals, changes to animal husbandry, etc. before resorting to lethal control (Boronyak and Jacobs 2023).
  • Lethal control should be targeted, evidence-based, and balanced against the need to maintain ecological resilience and animal welfare. Further, there is considerable evidence that haphazard,broad-scale baiting can actually make conflict with livestock producers worse (Allen & Gonzalez 1998; Allen 2015).
  • Pre- and post-baiting monitoring should be done to document the effect of 1080 aerial baiting in Victorian ecosystems and allow assessment of whether baiting programs are effective at reducing livestock predation, and hence, what the overall return on investment is.
  • Continued use of the terminology ‘wild dog’ is not justified because wild canids in Australia are dingoes and dingo backcrosses, not feral domestic dogs. The current policy distinction between dingoes and ‘wild dogs’ is based on an ecologically unproven distinction between ‘pure’ dingoes and ecologically functional ‘dingo backcrosses’. The weight of scientific evidence is that there is no valid ecological distinction to be made.
  • Lethal control programs may impact on the genetic viability of persisting dingo populations by compounding low genetic variability with reduced gene flow, resulting in genetic bottlenecking.
  • The “wild dog” bounty should be discontinued as it is not targeted to locations where there may belegitimate stock loss concern, is not evidence-based and it encourages the recreational killing of a listed threatened species.
  • The Australian public expects lethal control to be a last resort measure in attempting to solve human-wildlife conflicts.
  • Given the low number of sheep lost in Victoria to dingo predation, relative to the total Victorian sheep flock (100-200 sheep per million sheep annually), scarce public funds would be more cost-effectively spent on trialling financial compensation of landholders for verified stock loss, as an alternative to lethal control.
  • Lethal control of dingoes should not be undertaken without culturally appropriate consultation with the First Nations peoples of Victoria, some of whom consider dingoes to be a totem animal.

Aerial baiting programs pose direct risks to dingoes as well as other native fauna including Spot-tailed Quolls. It is not known what impact 1080 aerial baiting has on spot- tailed quoll populations in terms of sub-lethal effects to fertility, longevity and fitness, particularly if their population density is very low, as in Victoria. Aerial baiting programs suppress the dingo population which releases mesopredators such as feral cats andred foxes and large herbivores including feral pigs, deer and goats. The impacts of feral cats and red foxeson species like Spot-tailed Quolls is likely to be amplified in disturbed ecosystems that are subjected to 1080 baiting. Indiscriminate and non-target specific lethal management should not be implemented if there is a risk to the persistence of threatened native fauna, which includes both dingoes and Spot-tailed Quolls.

We strongly urge the Minister to revoke the Order in Council unprotecting dingoes in Victoria, cease the ‘wilddog’ bounty in Victoria and to reconsider the use of 1080 baiting for canids that will kill dingoes, including through aerial baiting. We also urge the Minister to affirm endorsement of the dingo as ‘a threatened species of conservation priority’ and direct the Department of Energy, Environment and Climate Action (DEECA) to develop a conservation strategy in Victoria that maximises the preservation and protection of dingoes in the Victorian landscape. On the balance of scientific evidence, ethical reasoning and society-wide expectations, protection of dingoes should be enhanced rather than diminished. We would also urge the Victorian Government to consult with dingo conservation organisations, scientists and First Nations people more widely during the development of Victorian State Government policy concerning dingoes.

Signed

Dr Kylie M Cairns, Research Fellow
School of Biological, Earth and Environmental Sciences University of New South Wales

Professor Mike Letnic
Ecology and Conservation Biology
School of Biological, Earth and Environmental Sciences University of New South Wales

Dr Bradley Smith, Senior Lecturer
Scientific Director, Australian Dingo Foundation School of Health,Medical and Applied Sciences Central Queensland University

Mr Rob Appleby
Centre for Planetary Health and Food Security Griffith University

Ms Zali Jestrimski
School of Life and Environmental Sciences University of Sydney

Mr Kevin D Newman
Quantitative and Applied Ecology Group,
School of Agriculture, Food and Ecosystem Sciences, University of Melbourne

Dr Barry Traill AM, Independent Zoologist

Dr Jack Tatler
East Coast Ecology

Associate Professor Justin W Adams, Director,
3D Innovation and Design (3DID) Studio
Head, Integrated Morphology and Palaeontology (IMAP) Laboratory Centre for Human Anatomy Education,
Department of Anatomy and Developmental Biology,
Monash Biomedicine Discovery Institute, Monash University

Dr Daniel Hunter
The Natural History Unit

Associate Professor Melanie Fillios
Director of Place Based Education and Research School of Humanities, Arts, and Social Sciences,
University of New England

Dr Loukas Koungoulos,
College of Asia and the Pacific Australian National University

Professor Euan Ritchie,
Wildlife Ecology and Conservation,
School of Life and Environmental Sciences,
Deakin University

Associate Professor Georgette Leah Burns
School of Environment and Science,
Centre for Planetary Health and Food Security Griffith University

Professor Chris Johnson, Professor of Wildlife Conservation
School of Natural Sciences,
University of Tasmania

Dr Holly Sitters, Honorary Research Fellow
School of Agriculture, Food and Ecosystem Sciences,
University of Melbourne

Professor Chris Dickman FAA, FRZS
Desert Ecology Research Group,
School of Life and Environmental Sciences,
The University of Sydney

Professor Corey J A Bradshaw, Matthew Flinders Professor of Global Ecology
Global Ecology | Partuyarta Ngadluku Wardli Kuu,
College of Science and Engineering,
Flinders University

Dr Neil Jordan, Senior Lecturer & Deputy Director (Research)
Centre for Ecosystem Science
School of Biological, Earth and Environmental Sciences,
University of New South Wales

Associate Professor Mathew Crowther,
School of Life and Environmental Sciences,
The University of Sydney

Dr Louise Boronyak, Associate Institute for Sustainable Futures, University of Technology Sydney

Dr Gabriel Conroy, Senior Lecturer,
School of Science, Technology and Engineering,
University of the Sunshine Coast

Dr Damian Morrant, CEO & Principal Ecologist,
Biosphere Environmental Consultants Pty Ltd

Dr Angela Wardell-Johnson, Environmental Sociologist,
Editorial Board for Conservation Biology,
Living in the lands of the Djiringanj & Thaua of the Yuin Nation, Merimbula, NSW

Dr Linda Van Brommel,
School of Natural Sciences,
University of Tasmania

References

Allen LR (2014) Wild dog control impacts on calf wastage in extensive beef cattle enterprises. Animal Production Science, 54, 214-220.

Allen LR (2015) Demographic and functional responses of wild dogs to poison baiting. Ecological Management & Restoration, 16, 58-66.

Allen LR, Gonzalez A (1998) Bating reduces dingo numbers, changes age structures yet often increases calf losses. In: 11th Australian Vertebrate Pest Conference.

Boronyak, L., Jacobs, B. and Smith, B (2023). Unlocking lethal dingo management in Australia. Diversity, 15(5), p.642.

Boronyak, L. and Jacobs, B., 2023. Pathways to coexistence with dingoes across Australian farminglandscapes. Frontiers in Conservation Science, 4, p.1126140.

Brook LA, Johnson CN, Ritchie EG (2012) Effects of predator control on behaviour of an apex predator and indirect consequences for mesopredator suppression. Journal of Applied Ecology, 49, 1278-1286.

Cairns KM, Crowther MS, Parker HG, Ostrander EA, Letnic M (2023) Genome-wide variant analyses reveal new patterns of admixture and population structure in Australian dingoes. Molecular Ecology, 32, 4133-4150

Davis NE, Forsyth DM, Triggs B, Pascoe C, Benshemesh J, Robley A, Lawrence J, Ritchie EG, Nimmo DG,Lumsden LF (2015) Interspecific and Geographic Variation in the Diets of Sympatric Carnivores: Dingoes/Wild Dogs and Red Foxes in South- Eastern Australia. Plos One, 10, e0120975.

Geary WL, Ritchie EG, Lawton JA, Healey TR, Nimmo DG (2018) Incorporating disturbance into trophicecology: fire history shapes mesopredator suppression by an apex predator. Journal of Applied Ecology, 55, 1594-1603.

Johnson CN, VanDerWal J (2009) Evidence that dingoes limit abundance of a mesopredator in easternAustralian forests. Journal of Applied Ecology, 46, 641-646.

Letnic M, Baker L, Nesbitt B (2013) Ecologically functional landscapes and the role of dingoes as trophic regulators in south-eastern Australia and other habitats. Ecological Management and Restoration, 14, 101-105.

Letnic M, Koch F (2010) Are dingoes a trophic regulator in arid Australia? A comparison of mammal communities on either side of the dingo fence. Austral Ecology, 35, 167- 175.

Letnic M, Ritchie EG, Dickman CR (2012) Top predators as biodiversity regulators: the dingo Canis lupus dingo as a case study. Biological Reviews of the Cambridge Philosophical Society, 87, 390-413.

Mitchell DR, Cairns SC, Koertner G, Bradshaw CJA, Saltré F, Weisbecker V (2023) Differential developmentrates and demographics in red kangaroo (Osphranter rufus) populations separated by the dingo barrier fence. Journal of Mammalogy, doi:10.1093/jmammal/gyad053.

Morris T, Letnic M (2017) Removal of an apex predator initiates a trophic cascade that extends fromherbivores to vegetation and the soil nutrient pool. Proceedings of the Royal Society B: Biological Sciences, 284, 20170111.

Moseby KE, Crowther MS, Letnic M (2019) Ecological role of an apex predator revealed by a reintroduction experiment and Bayesian statistics. Ecosystems, 22, 283-295.

Newsome TM, Ballard G-A, Crowther MS, Dellinger JA, Fleming PJS, Glen AS, Greenville AC, Johnson CN,Letnic M, Moseby KE, Nimmo DG, Nelson MP, Read JL, Ripple WJ, Ritchie EG, Shores CR, Wallach AD, Wirsing AJ, Dickman CR (2015) Resolving the value of the dingo in ecological restoration. Restoration Ecology, 23, 201-208.

Pople AR, Grigg GC, Cairns SC, Beard LA, Alexander P (2000) Trends in the numbers of red kangaroos and emus on either side of the South Australian dingo fence: evidence for predator regulation? Wildlife Research, 27, 269-276.

Prowse TAA, Johnson CN, Cassey P, Bradshaw CJA, Brook BW (2015) Ecological and economic benefits to cattle rangelands of restoring an apex predator. Journal of Applied Ecology, 52, 455-466.

Smith BP, Cairns KM, Adams JW, Newsome TM, Fillios M, Déaux EC, Parr WCH, Letnic M, Van Eeden LM, Appleby RG, Bradshaw CJA, Savolainen P, Ritchie EG, Nimmo DG, Archer-Lean C, Greenville AC, Dickman CR, Watson L, Moseby KE, Doherty TS, Wallach AD, Morrant DS, Crowther MS (2019)Taxonomic status of the Australian dingo: the case for Canis dingo Meyer, 1793. Zootaxa, 4564, 173-197.

Thompson ER, Driscoll DA, Venn SE, Geary WL, Ritchie EG (2022) Interspecific variation in the diet of anative apex predator and invasive mesopredator in an alpine ecosystem. Austral Ecology, 47, 1260-1270.

van Bommel L, Johnson CN (2012) Good dog! Using livestock guardian dogs to protect livestock from predators in Australia’s extensive grazing systems. Wildlife Research, 39, 220-229.

van Bommel L, Johnson CN (2023) Still a good dog! Long-term use and effectiveness of livestock guardian dogs to protect livestock from predators in Australia’s extensive grazing systems. Wildlife Research, doi:10.1071/WR23008.

van Eeden LM, Newsome TM, Crowther MS, Dickman CR, Bruskotter J (2019) Social identity shapes support for management of wildlife and pests. Biological Conservation, 231, 167-173.

van Eeden LM, Newsome TM, Crowther MS, Dickman CR, Bruskotter J (2020) Diverse public perceptions of species’ status and management align with conflicting conservation frameworks. Biological Conservation, 242, 108416.

Wallach AD, Johnson CN, Ritchie EG, O’Neill AJ (2010) Predator control promotes invasive dominated ecological states. Ecology Letters, 13, 1008-1018.

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Science communication

Euan Ritchie nominated for Eureka Prize

I am honoured to be named among 55 entries shortlisted for 18 Australian Museum Eureka Prizes; Australia’s premier science awards

The 2023 awards recognise leaders in research and innovation, leadership, science engagement and school science.

I am nominated for the Celestino Eureka Prize which promotes the understanding of science.

The winners will be announced on Wednesday 23 August 2023.

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Science communication The Conversation

The Conversation: Land clearing and fracking in Australia’s Northern Territory threatens the world’s largest intact tropical savanna

Image credit Jill Marie Smith via Shutterstock

By Euan Ritchie (Deakin University), Brett Murphy (Charles Darwin University), and John Woinarski (Charles Darwin University).

This article is republished from The Conversation under a Creative Commons license. Read the original article.

The Northern Territory government’s plan to turn 100,000 hectares over to large-scale crops such as cotton and its support for onshore gas extraction is threatening the world’s largest intact tropical savanna.

This is a region of immense cultural, environmental and economic value. It is home to the World Heritage listed Kakadu National Park and rich biodiversity.

As wildlife ecologists and conservation scientists, we are deeply concerned about plans announced last month that would intensify land clearing.

Accelerating habitat loss would all but guarantee failure of the Australian government’s zero extinctions plan, notwithstanding the fact many of the species placed in harm’s way by fracking and farming are yet to be discovered.

Rather than relaxing regulation to support development, we need to urgently overhaul Australia’s grossly inadequate environmental laws and safeguards, which also lack enforcement.

Earlier this year (2023), the ABC investigated suspicious land clearing in the NT.

Land clearing leaves wildlife homeless

When we think of unregulated land clearing and habitat loss in the tropics, impoverished countries in tropical South America, Africa and Asia spring to mind. Not a relatively rich, developed country like Australia.

But across Australia’s tropical north, landscapes are afforded little protection. Land clearing leads to habitat loss, erosion and pollution of waterways.

Threatened species such as the Gouldian finch, black-footed tree-rat, and northern river shark are being put at risk.

Agriculture, including livestock grazing (pastoralism), is by far the greatest driver of land clearing in northern Australia.

The land subject to clearing approvals in the NT increased by 300% between 2018 and 2021. This trend is expected to continue.

First Nations Peoples, environmental scientists, conservation groups, and other members of the public fear the push to develop cotton in the NT will mean clearing a further 100,000 ha. That stems from the 2019 NT Farmers Association business case for the construction of a cotton processing facility in the NT, which is nearing completion.

Weak laws afford limited protection

Our national environmental protection law, the Environment Protection and Biodiversity Conservation Act, relies on self-referral of development activities for assessment.

Proponents of pastoral land clearing projects almost never refer their projects to the Australian government for assessment, even if their projects are set to deplete thousands of hectares of habitat within the known range of threatened species.

This means the potential impacts on threatened species and other natural values supposedly protected by national environmental laws, are never assessed by experts. And there is no mechanism for anyone else to refer the development for assessment.

The NT has no dedicated land clearing or native vegetation management legislation. The Pastoral Land Board approves land clearing across pastoral leases (which cover more than 45% of the territory’s land area). Permits for up to 5,000ha are generally granted without any formal environmental impact assessment.

On one occasion the proponent referred an application to the NT Environment Protection Agency. But it was deemed clearing the 10,000ha would not have a significant impact. So there was no environmental impact assessment required.

Some of the most notable examples of recent uncontrolled land clearing, without any assessment of biodiversity impacts, were for cotton on pastoral land in the NT.

Finally, the current regulatory system covers single development proposals. It is poorly equipped to consider the cumulative impacts of successive individual clearing events.

Fuelling fires and biodiversity loss

The push to extract gas from the Beetaloo Basin represents another major threat to the region. The export of fracked gas from Beetaloo will be facilitated by the Middle Arm Sustainable Development precinct.

This runs counter to warnings from the world’s climate scientists that we must rapidly move away from a reliance on fossil fuels if we are to meet ambitions to keep global warming below 1.5°C.

For northern Australia, climate change means more severe storms, coral bleaching, death of mangroves, more intense and extended dry seasons (with less water for wildlife), and increased fire risk and severity.

Threats may compound upon each other, as invasive gamba and buffel grass that favour and promote fire would be even more likely to thrive and expand.

A better future for Australia’s tropical savannas

To protect Australia’s tropical savannas from uncontrolled land clearing and gas extraction, we need:

  • Stronger national environment protection legislation. The federal government is in the process of reviewing the EPBC Act. This is a perfect opportunity to recognise and protect our tropical savannas. The new act must have stronger requirements for the formal assessment of all projects that are likely to affect threatened species. It must also take the cumulative impacts of multiple small projects into account, to avoid “death by a thousand cuts”.
  • New NT-focused environmental law such as a Biodiversity Conservation Act, as proposed by the Environmental Defenders Office, Environmental Justice Australia and the Environment Centre NT, would provide tighter regulation of land clearing. This could also consider greenhouse gas emissions, carbon storage and native food production (bush tucker), as well as the intrinsic cultural values of intact ecosystems.
  • Most importantly, conservation planning that is community-led, scientifically grounded and respects the wishes and concerns of First Nations Peoples regarding enterprises on and management of Country. Recent pastoral land clearing in the NT has ignored the concerns of Traditional Owners over the loss of Country (despite having legally recognised Native Title on the land).

Avoid repeating past mistakes

While Australia’s tropical savannas are massive in scale, they are increasingly insecure and under significant strain. Against a backdrop of climate change, biodiversity decline and extinction crises, any further development of the north must be subject to rigorous risk-assessment and appropriate environmental protections.

This is essential to ensure any economic benefits justify potential risks. We simply can’t afford to risk repeating mistakes already inflicted on much of southern Australia.

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Student news

Associate Research Fellow opportunity

Come and work with us!

Level A academic salary $74,024 to $99,512 + 17% superannuation

Based at Deakin University Burwood Campus in Naarm (Melbourne)

Full-time and fixed term for 2 years

Applications close Friday 9 June 2023

Image credit Angus Emmett

This role will provide support for predator-related research as part of a DEECA-funded project.

The appointee will help examine spatial and temporal relationships between predators and prey and environmental features.

Your work will include field-based wildlife surveys, analysis of camera data and ecological statistical modelling.

Key responsibilities

  • Conducting high-quality research, scholarship and creative activities generating high impact outputs, with mentorship
  • Engaging collaboratively to participate in novel and high-quality research or creative activities
  • Communicating outputs, including as part of team
  • Ensuring impact of academic activity on the field and the community
  • Supporting and may lead applications for funding for research and creative activities
  • Participating in intra- and inter-disciplinary research collaborations
  • Building awareness of industry partners and participates in opportunities for research partnerships
  • Supporting and may lead in applications for external competitive and other funding
  • Co-supervising honours to timely outcomes with productive high-quality outcomes
  • Develop working relationship with mentors and supervisors
  • Developing early career research plan with guidance from mentors and supervisors
  • Adopting a culture of research excellence, innovation and impact
  • Building awareness of relevant industry partners and opportunities for HDRs/ECRs placements

Key selection criteria

  • PhD in a relevant discipline and/or other relevant qualifications and experience
  • Emerging research and scholarship through publications, and/or other outputs as appropriate to the discipline
  • Ability to make a contribution to communities through research
  • Capacity to contribute to teaching, research and administration
  • Excellent interpersonal skills and a proven ability to establish good working relationships with colleagues
  • Ability to make a contribution to community engagement for research

Regular travel will be required within Victoria, as part of field-based research and liaison with stakeholders and industry partners. A manual drivers licence and Working with Children check are required.

Position description

PD Associate Research Fellow (539132) PDF 180 KB

More information

For a confidential discussion regarding this position, please contact me.

For more information, please see the Deakin University website.

Categories
Research

Integrating sensory ecology and predator-prey theory to understand animal responses to fire

Authors: Alice Michel, Jacob R Johnson, Richard Szeligowski, Euan G Ritchie, and Andrew Sih

Published in: Ecology Letters

Abstract

Fire regimes are changing dramatically worldwide due to climate change, habitat conversion, and the suppression of Indigenous landscape management.

Although there has been extensive work on plant responses to fire, including their adaptations to withstand fire and long-term effects of fire on plant communities, less is known about animal responses to fire. Ecologists lack a conceptual framework for understanding behavioural responses to fire, which can hinder wildlife conservation and management.

Here, we integrate cue-response sensory ecology and predator-prey theory to predict and explain variation in if, when and how animals react to approaching fire.

Inspired by the literature on prey responses to predation risk, this framework considers both fire-naïve and fire-adapted animals and follows three key steps: vigilance, cue detection and response.

We draw from theory on vigilance tradeoffs, signal detection, speed-accuracy tradeoffs, fear generalization, neophobia and adaptive dispersal.

We discuss how evolutionary history with fire, but also other selective pressures, such as predation risk, should influence animal behavioural responses to fire.

We conclude by providing guidance for empiricists and outlining potential conservation applications.

Michel A, Johnson JR, Szeligowski R, Ritchie EG, Sih A (2023) Integrating sensory ecology and predator‐prey theory to understand animal responses to fire. Ecology Letters PDF DOI

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Media

news.com.au: Advocates ‘devastated’ by major budget snub

By Georgina Noack

Moments after Labor’s second budget was released, Professor Euan Ritchie took to Twitter to declare Australia was growing ‘meaner’ and ‘crueler’ – here’s why.

For a Government that has promised to take action on climate change and environmental protection after a “decade of neglect” by the Coalition, Labor’s second budget has left experts and advocates bitterly disappointed.

But when Treasurer Jim Chalmers handed down the Government’s plan for a “stronger economy and a fairer society”, Deakin University Professor of wildlife ecology and conservation Euan Ritchie was “devastated” to hear there was no such policy talk.

He later told news.com.au his disappointment was shared by many in the sector, because the 2023-24 budget “continues to neglect and perpetuate the myth that we can’t properly invest in conservation or protecting the environment and wildlife”.

“We are in a biodiversity and climate crisis, which is an existential threat to life as we know it. We simply can’t meet Labor’s targets for no new extinctions.”

Professor Euan Ritchie

Read the full article at news.com.au.

Categories
Research

Tomorrow’s Country: Practice-oriented principles for Indigenous cultural fire research in south-east Australia

Authors: Andrea Rawluk, Timothy Neale, Will Smith, Tim Doherty, Euan Ritchie, Jack Pascoe, Minda Murray, Rodney Carter, Mick Bourke, Scott Falconer, Dale Nimmo, Jodi Price, Matt White, Paul Bates, Nathan Wong, Trent Nelson, Amos Atkinson, and Deborah Webster

Published in: Geographical Research

Abstract

First Nations peoples are revitalising diverse cultural fire practices and knowledge. Institutional and societal recognition of these practices is growing. Yet there has been little academic research on these fire practices in south-east Australia, let alone research led by Aboriginal people.

We are a group of Indigenous and settler academics, practitioners, and experts focused on cultural fire management in the Victorian Loddon Mallee region. Using interviews and workshops, we facilitated knowledge sharing and discussion. In this paper, we describe three practice-oriented principles to develop and maintain collaborations across Aboriginal groups, researchers, and government in the Indigenous-led revitalisation of fire on Country: relationships (creating reciprocity and trust), Country (working with place and people), and power (acknowledging structures and values). Collaborations based on these principles will be unique to each temporal, social, cultural, and geographic context.

Considering our findings, we acknowledge the challenges that exist and the opportunities that emerge to constructively hold space to grow genuinely collaborative research that creates change. We suggest that the principles we identify can be applied by anyone wanting to form genuine collaborations around the world as the need for social–ecological justice grows.

Rawluk A, Neale T, Smith W, Doherty T, Ritchie EG, Pascoe J, Murray M, Carter R, Bourke M, Falconer S, Nimmo D, Price J, White M, Bates P, Wong N, Nelson T, Atkinson A, Webster D (2023) Tomorrow’s Country: Practice‐oriented principles for Indigenous cultural fire research in south‐east Australia. Geographical Research PDF DOI

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Media

The Guardian: Australia being unable to afford greater environmental protection is a government myth that refuses to die

By Euan Ritchie

Redirecting massive defence spending and implementing a windfalls gains tax in the 2023 federal budget could go a long way to saving our environment.

Like trickle-down economics or goldfish memories only being three seconds long, there’s a myth that continues to haunt this nation, and, like a zombie, it refuses to die. This myth, and the damage it inflicts, has been aided and abetted by the Australian government. This deception is propagated and perpetuated for political purposes. What is this myth? The notion that our government simply can’t afford to greatly increase spending on environmental protection and recovery.

‘Australia’s more than 1,900 threatened species in dire need of increased care are reduced to 110 priority species with insufficient additional funding.’ Photograph: Brad Leue/Alamy

As we approach another federal budget, the government’s priorities are writ large. At the same time, we continue to bear witness to – and suffer through – the devastating impacts of a changing and deteriorating climatecollapsing ecosystems and an increasing number of threatened species racing towards extinction.

Continuing to choose not to significantly lift environmental spending – despite much public support to do so – and the mealy-mouthed attempts and contortions to justify this callous neglect are a national disgrace. It betrays the realities of koalas now being endangered across much of the species distribution, the Great Barrier Reef losing its colour as a result of repeated bleaching events and state of the environment reports consistently demonstrating that, overall, our environment is in poor condition and deteriorating towards flatlining.

Read the full article on The Guardian website.

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Publications Research

Pyrodiversity trade-offs: A simulation study of the effects of fire size and dispersal ability on native mammal populations in northern Australian savannas

Authors: Hugh F Davies, Casey Visintin, Brett P Murphy, Euan G Ritchie, Sam C Banks, Ian D Davies, and David MJS Bowman

Published in: Biological Conservation

Abstract

Maximising the spatiotemporal variability of prescribed fire (i.e. pyrodiversity) is often thought to benefit biodiversity. However, given mixed empirical support, the generality of the pyrodiversity hypothesis remains questionable.

Here, we use a simulation experiment to explore the effects of spatiotemporal fire patterns on the population trajectories of four mammal species in a northern Australian savanna: northern brown bandicoot (Isoodon macrourus), northern brushtail possum (Trichosurus vulpecula arnhemensis), grassland melomys (Melomys burtoni), and northern quoll (Dasyurus hallucatus). Underpinned by data from a landscape-scale fire experiment, we simulated mammal population trajectories under three scenarios of fire size (ambient, small/dispersed fires, large/clumped fires) and three levels of dispersal ability (low, moderate, high) over a 21-year period across the Kapalga area of Kakadu National Park.

The simulated population size of all four species declined markedly, regardless of fire spatial pattern and dispersal ability. However, the predicted final population size (i.e. number of individuals in the final timestep of the simulation) for the northern brown bandicoot, northern brushtail possum and grassland melomys were significantly influenced by fire size, with declines most severe under the small/dispersed fire scenario.

Our results suggest that maximising the dispersion of small fires at the expense of disturbance refugia (such as less-frequently burnt areas) may exacerbate the severity of mammal decline. This highlights the importance of considering trade-offs between spatial (i.e. fire dispersion) and temporal (i.e. fire frequency) aspects of pyrodiversity, and the potential risks when applying fire management for biodiversity conservation without a firm understanding of the requirements of the target species.

Davies HF, Visintin C, Murphy BP, Ritchie EG, Banks SC, Davies ID, Bowman DMJS (2023) Pyrodiversity trade-offs: A simulation study of the effects of fire size and dispersal ability on native mammal populations in northern Australian savannas. Biological Conservation PDF DOI

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Media Science communication The Conversation

The Conversation: Species don’t live in isolation: what changing threats to 4 marsupials tell us about the future

Once abundant, woylies – or brush-tailed bettongs – are now critically endangered. John GouldCC BY-SA

By William Geary (Deakin University), Adrian Wayne (The University of Western Australia), Euan Ritchie (Deakin University) and Tim Doherty (University of Sydney).

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Conserving native wildlife is a challenging task and Australia’s unenviable extinction record shows us we urgently need more sophisticated and effective approaches. 

Too often we focus on saving individual threatened species. But in the wild, species do not live neatly in isolation. They are part of rich ecosystems, relying on many other species to survive. To save species often means saving this web of life. 

Our new research models what’s likely to happen to four well-known Western Australian marsupials in the biodiversity hotspot of south-western Australia, by identifying key drivers of their populations over time. 

In the past, these species were most at risk from habitat loss. But when we ran our models forwards, we found all four species would be at more risk from climate change, which is bringing heightened fire risk and a drying trend to the region. Even better control of foxes – a major predator – did not offset the trend fully.

Our work adds further weight to efforts to protect ecosystems in all their complexity. The way species – including feral predators – interact takes place against a changing climate, fire regimes, and human-made change, like logging and grazing. 

To give native species their best chance of survival, we have to embrace ecosystem-based conservation, rather than focusing on rescuing individual species. 

What did we find?

We looked at long-term monitoring data to find out what was having the most impact on the woylie (brush-tailed bettong), chuditch (western quoll), koomal (western brushtail possum) and the quenda (southern brown bandicoot), four animals living in Upper Warren jarrah forests.

Our study species, left to right and clockwise: the koomal (western brushtail possum), chuditch (western quoll), quenda (southern brown bandicoot) and the woylie (brush-tailed bettong). The Department of Biodiversity, Conservation and Attractions (DBCA)

All four have undergone considerable population change over the last few decades and some are now threatened due to predation by foxes and feral cats, habitat loss and increased frequency of droughts and bushfires. To add to that, controlled burns, lethal fox control and timber harvesting have all taken place in our study region within this time. What we didn’t know was how these threats and conservation efforts interact. 

To find out, we built a complex statistical model of the ecosystem to pinpoint what was driving population change geographically and over time. 

We found the abundance of these species were affected most by the historical impact of habitat loss, as well as less food in the form of vegetation or prey due to the area’s ongoing decline in rainfall. 

Of the habitat lost here, most was cleared during the 19th and early 20th centuries. But now it has more or less stopped, the legacies of this change continue through the effects of habitat fragmentation and increased incursion by introduced species. That means the main falls in abundance took place decades ago. 

What about fire and foxes? These threats had less effect than habitat loss and rainfall declines, which we attribute to the broad management of both of these in the region. It was also difficult to quantify the effects of fox control because of the lack of control areas – essentially, comparable areas without poison baits in the region. 

Our work shows there’s not one simple answer for managing this ecosystem. Everything is connected. We need to embrace this complexity so that we can better pinpoint where our actions can make a difference.

This jarrah forest is typical of our study region. The Department of Biodiversity, Conservation and Attractions (DBCA)

What’s likely to happen?

While habitat loss was the major historical threat, the future looks to be different. Severe fire is set to increase and rainfall reduce due to climate change. This indicates all four species will see falling populations. 

Annual rainfall in south-western Australia has already fallen at least 20% below the historical average and further declines are expected. If severe fires arrive more often – and overlap with reduced rainfall – we could see even greater population loss. 

These threats mean local conservation managers will be less able to help. Controlling fox numbers may help at present, but in a drier, fierier future, things will get harder. 

Our modelling suggests that for woylie and koomal, lethal fox control could boost their resilience to severe fire and reduced rainfall, but not completely offset the expected losses.

Jarrah forests are now experiencing more bushfires. The Department of Biodiversity, Conservation and Attractions (DBCA)

What does this mean for ecosystem management?

It’s long been a goal for conservationists to manage ecosystems as a whole. In reality, this is often incredibly difficult, as we need to consider multiple threats (such as fire and invasive species) and conflicting requirements of different species, in the face of uncertainty about how some ecosystems work, as well as limited budgets

Ecosystems are complex webs of interacting species, processes and human influences. If we ignore this complexity, we can miss conservation opportunities, or see our actions have less effect than we expected. 

Sometimes, well-intended actions can actually produce worse outcomes for some species, such as fox control leading to a boom in wallabies who strip the forest of everything edible. 

Studies like ours wouldn’t be possible without the careful collection and synthesis of data over decades. As global climate change accelerates and the effects on ecosystems become increasingly unpredictable, conservation managers are flying blind if they do not have long-term monitoring to inform decisions on where and when to act. 

So what can our conservation managers do? They can help ecosystems survive by doing two things. First, keep managing the threats within our control – such as invasive predators and ongoing habitat loss – to help reduce damage from other threats. Second, model and anticipate the effects of future change, and use that knowledge to be as prepared as we can.

The Conversation
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Publications Research

Identifying historical and future global change drivers that place species recovery at risk

Authors: William L Geary, Ayesha IT Tulloch, Euan G Ritchie, Tim S Doherty, Dale G Nimmo, Marika A Maxwell, and Adrian F Wayne

Published in: Global Change Biology

Abstract

Ecosystem management in the face of global change requires understanding how co-occurring threats affect species and communities. Such an understanding allows for effective management strategies to be identified and implemented. An important component of this is differentiating between factors that are within (e.g. invasive predators) or outside (e.g. drought, large wildfires) of a local manager’s control.

In the global biodiversity hotspot of south-western Australia, small- and medium-sized mammal species are severely affected by anthropogenic threats and environmental disturbances, including invasive predators, fire, and declining rainfall. However, the relative importance of different drivers has not been quantified.

We used data from a long-term monitoring program to fit Bayesian state-space models that estimated spatial and temporal changes in the relative abundance of four threatened mammal species: the woylie (Bettongia penicillata), chuditch (Dasyurus geoffroii), koomal (Trichosurus vulpecula) and quenda (Isoodon fusciventor). We then use Bayesian structural equation modelling to identify the direct and indirect drivers of population changes, and scenario analysis to forecast population responses to future environmental change.

We found that habitat loss or conversion and reduced primary productivity (caused by rainfall declines) had greater effects on species’ spatial and temporal population change than the range of fire and invasive predator (the red fox Vulpes vulpes) management actions observed in the study area. Scenario analysis revealed that a greater extent of severe fire and further rainfall declines predicted under climate change, operating in concert are likely to further reduce the abundance of these species, but may be mitigated partially by invasive predator control.

Considering both historical and future drivers of population change is necessary to identify the factors that risk species recovery. Given that both anthropogenic pressures and environmental disturbances can undermine conservation efforts, managers must consider how the relative benefit of conservation actions will be shaped by ongoing global change.

Geary WL, Tulloch AIT, Ritchie EG, Doherty TS, Nimmo DG, Maxwell MA, Wayne AF (2023) Identifying historical and future global change drivers that place species recovery at risk. Global Change Biology PDF DOI

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Publications

Understanding conflict among experts working on controversial species: A case study on the Australian dingo

Authors: Valerio Donfrancesco, Benjamin L Allen, Rob Appleby, Linda Behrendorff, Gabriel Conroy, Mathew S Crowther, Christopher R Dickman, Tim Doherty, Bronwyn A Fancourt, Christopher E Gordon, Stephen M Jackson, Chris N Johnson, Malcolm S Kennedy, Loukas Koungoulos, Mike Letnic, Luke K‐P Leung, Kieren J Mitchell, Bradley Nesbitt, Thomas Newsome, Carlo Pacioni, Justine Phillip, Brad V Purcell, Euan G Ritchie, Bradley P Smith, Danielle Stephens, Jack Tatler, Lily M van Eeden, Kylie M Cairns

Published in: Conservation Science and Practice

Abstract

Expert elicitation can be valuable for informing decision-makers on conservation and wildlife management issues. To date, studies eliciting expert opinions have primarily focused on identifying and building consensus on key issues. Nonetheless, there are drawbacks of a strict focus on consensus, and it is important to understand and emphasize dissent, too.

This study adopts a dissensus-based Delphi to understand conflict among dingo experts. Twenty-eight experts participated in three rounds of investigation.

We highlight disagreement on most of the issues explored. In particular, we find that disagreement is underpinned by what we call “conflict over values” and “conflict over evidence.” We also note the broader role played by distrust in influencing such conflicts.

Understanding and recognizing the different elements shaping disagreement is critical for informing and improving decision-making and can also enable critique of dominant paradigms in current practices. We encourage greater reflexivity and open deliberation on these aspects and hope our study will inform similar investigations in other contexts.

Donfrancesco V, Allen BL, Appleby R, Behrendorff L, Conroy G, Crowther MS, Dickman CR, Doherty T, Fancourt BA, Gordon CE, Jackson SM, Johnson CN, Kennedy MS, Koungoulos L, Letnic M, Leung LK ‐P., Mitchell KJ, Nesbitt B, Newsome T, Pacioni C, Phillip J, Purcell BV, Ritchie EG, Smith BP, Stephens D, Tatler J, van Eeden LM, Cairns KM (2023) Understanding conflict among experts working on controversial species: A case study on the Australian dingo. Conservation Science and Practice PDF DOI 

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Media Science communication

The Conversation: One of these underrated animals should be Australia’s 2032 Olympic mascot. Which would you choose?

A velvet worm from Mt Elliot, North Queensland. Image credit: Alexander Dudley/Faunaverse. Inset: A potential mascot design. Image credit: Wes Mountain/The Conversation.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

Australia is set to host the 2032 Olympic games in Queensland’s capital Brisbane, captivating an audience of billions. With so many eyes on Australia, the burning question is, of course, what animal(s) should be the official mascot(s) of the games, and why?

Summer Olympics past have featured recognisable animal mascots such as Waldi the daschund (Munich, 1972), Amik the beaver (Montreal, 1976), Misha the bear (Moscow, 1980), Sam the eagle (Los Angeles, 1984) and Hodori the tiger (Seoul, 1988).

Iconic and familiar mammals and birds dominate the list. The trend continued at Sydney’s 2000 games which featured Syd (playtpus), Olly (kookaburra) and Millie (echidna).

But the Brisbane Olympics is a great opportunity to showcase lesser known species, including those with uncertain futures.

Sadly Australia is a world leader in extinctions. Highlighting species many are unfamiliar with, the threats to them and their respective habitats and ecosystems, could help to stimulate increased conservation efforts.

From a “worm” that shoots deadly slime from its head, to a blind marsupial mole that “swims” underground, let’s take a look at three leading candidates (plus 13 special mentions). What makes them so special, and what physical and athletic talents do they possess?

Onychophorans, or velvet worms

Velvet worms are extraordinary forest and woodland denizens thought to have changed little in roughly 500 million years. Australian velvet worms are often smaller than 5 centimetres and look a bit like a worm-caterpillar mash up. They’re found across Australia and other locations globally.

Their waterproof, velvet-like skin is covered in tiny protusions called papillae, which have tactile and smell-sensitive bristles on the end. Velvet worms possess antennae and Australian species have 14-16 pairs of stumpy “legs”, each with a claw that helps them move across uneven surfaces such as logs and rocks.

Their colour varies between species, often blue, grey, purple or brown. Many display exquisite, detailed and showy patterns that can include diamonds and stripes – clear X-factor for a potential mascot.

Although velvet worms may be relatively small and, dare I say it, adorable, don’t be fooled. These animals are voracious predators.

They capture unsuspecting prey – other invertebrates – at night by firing sticky slime from glands on their heads. Once the victim is subdued, velvet worms bite their prey and inject saliva that breaks down tissues and liquefies them, ready to be easily sucked out.

If this isn’t intimidating enough, one species (Euperipatoides rowelli) lives and hunts in groups, with a social hierarchy under the control of a dominant female who feeds first following a kill.

Despite their formidable abilities, velvet worms are vulnerable to habitat destruction and fragmentation, and a changing climate.

Jalbil (Boyd’s forest dragon)

Jalbil is found in the rainforests of tropical North Queensland. They are a truly striking lizard – bearing a prominent pointy crest and a line of spikes down the back, distinct conical cheek scales and a resplendent yellow throat (dewlap) which can be erected to signal to each other.

Jalbil (Boyd’s forest dragon) is found in the rainforests of North Queensland’s Wet Tropics. Chris Jolly

Despite their colourful and ornate appearance, Jalbil can be very hard to spot as they’re perfectly camouflaged with their surroundings. They spend much of their time clinging vertically to tree trunks often at or below human head-height. Some have favourite trees they use more frequently.

If they detect movement, they simply move around the tree trunk to be out of direct view.

Reaching lengths of around 50cm, Jalbil mostly eat invertebrates, including ants, beetles, grasshoppers and worms. Males may have access to multiple female mates, and breeding is stimulated by storms at the beginning of the wet season.

While Jalbil are under no immediate threat, their future is uncertain. Jalbil are ectothermic, so unlike mammals and birds (endothermic), they can’t regulate their internal body heat through metabolism. Sunlight is often very patchy and limited below the rainforest canopy, restricting opportunities for basking to warm up.

Instead, Jalbil simply allow their body temperature to conform with the ambient conditions of their environment (thermo-conforming). This means if climate change leads to increased temperatures in the rainforests of Australia’s Wet Tropics, Jalbil may no longer be able to maintain a safe body temperature and large areas of habitat may also become unsuitable.

Itjaritjari and kakarratul (southern and northern marsupial moles)

These remarkable subterranean-dwelling marsupials really are in a league of their own. Both moles can fit in the palm of your hand, measuring up to about 150 millimetres and weighing about as much as a lemon (40-70 grams).

What these diminutive mammals lack in size they make up for in digging power – if only digging were an official Olympic sport. In central dunefields, they can dig up to 60 kilometres of tunnel per hectare.

Marsupial moles are covered in fine, silky, creamy-gold fur. They have powerful short arms with long claws, shovels for furious digging. Their back legs also help them push. Instead of creating and living in permanent burrows, they “swim” underground across Australia’s deserts for most of their lives.

The impressive adaptations don’t end there either. They also have ridiculously short but strong, tough-skinned tails that serve as anchors while digging. Females also have a backwards-facing pouch and all have nose shields that protect their nostrils, ensuring sand doesn’t end up where it’s not supposed to.

Due to living underground for most of their lives, many mole mysteries remain regarding their day-to-day lives. Scientists do know they eat a wide range of invertebrates including termites, beetles and ants, and small reptiles such as geckoes.

But while neither species is thought to be in danger of extinction, there are no reliable population estimates across their vast distributions. What’s more, introduced predators (feral cats and foxes) are known to prey upon them. Itjaritjari is listed as vulnerable in the Northern Territory.

And 13 special mentions go to…

With so many amazing wildlife species in Australia, it really is a near impossible task to choose our next mascot. So I also want to give special mentions to the following worthy contenders:

The Australian giant cuttlefish

These marine animals put on spectacular, colourful displays each year when they form large breeding aggregations.

Arnkerrth (thorny devil)

A desert-dwelling, ant-eating machine that can drink simply by standing in puddles.

Thorny devils can eat more than 1,000 ants per meal. Euan Ritchie

The Torresian striped possum

This striking black and white possum is thought to have the largest brain relative to body size of any marsupial. Their extra long fourth finger makes extracting delicious grubs from rotting wood a cinch.

Kila (palm cockatoo)

Our largest and arguably most spectacular “rockatoo”, which plays the drums.

Ulysses butterfly

Also known as mountain blue butterflies, the vivid, electric blue wings of Ulysses butterflies can span as much as 130 millimetres.

The Australian lungfish

A living fossil, which is now found only in Queensland, can breath air as well as in the water.

Mupee, boongary or marbi (Lumholtz’s tree kangaroo)

Despite being powerfully built for climbing, Lumholtz’s tree kangaroos are also adept at jumping, when alarmed they’ve been known to jump from heights of up to 15m to the ground.

The green tree python

Green tree pythons are the most vivid green snake you can possibly imagine. While adult pythons are a vibrant green the juveniles may be bright yellow or red (but not in Australia), changing colour when they are about half a metre long.

Another reptile with serious wow factor. Chris Jolly

The chameleon grasshopper

Based on temperature, male chameleon grasshoppers can change colour from black to turquoise, and back to black again, each day.

Greater gliders

These fabulous fuzzballs can glide up to 100m in a single leap.

Peacock spiders

Peacock spiders come in rainbow colours and the males sure know how to shake it. Their vivid colours, such as in the species Maratus volans, are due to tiny scales that form nanoscopic lenses created from carbon nanotubes.

Peacock spiders are found only in Australia. Joseph Schubert

Corroboree frogs

They are a striking black and yellow, and desperately need help.

And finally, I’ll always have a soft spot for Australia’s much maligned canid, the dingo.

So now, over to you. What are your suggestions for unique animal mascots at the 2032 Brisbane Olympics?
The Conversation

The Conversation
Categories
Publications

Threat-abatement framework confirms habitat retention and invasive species management are critical to conserve Australia’s threatened species

Authors: Stephen G Kearney, James EM Watson, April E Reside, Diana O Fisher, Martine Maron, Tim S Doherty, Sarah M Legge, John CZ Woinarski, Stephen T Garnett, Brendan A Wintle, Euan G Ritchie, Don A Driscoll, David Lindenmayer, Vanessa M Adams, Michelle S Ward, and Josie Carwardine

Published in: Biological Conservation

Abstract

Earth’s extinction crisis is escalating, and threat classification schemes are increasingly important for assessing the prominent drivers and threats causing species declines. However, a complementary framework for assessing the conservation responses needed to abate these threatening processes is lacking.

Here we draw on expert knowledge and published literature to develop a threat-abatement framework which groups threats based on the shared conservation goal of the actions needed to abate their impact and apply it to 1532 threatened species across the Australian continent.

Our analysis shows that the most important conservation actions across Australia are to retain and restore habitat, due to the threats posed by habitat destruction and degradation (via logging, mining, urbanisation, roads, and agriculture) to 86% of Australia’s threatened species. Most species also require the effective control of invasive species and diseases (82%) and improved fire management (66%).

Countering individual threats will not be enough to support species survival or recovery, because almost all species (89%) require multiple, integrated management responses to redress their threats. Our threat abatement framework enables rapid identification of broad conservation responses to aid recovery of threatened species and can be applied in other regions, scales and contexts.

Kearney SG, Watson JEM, Reside AE, Fisher DO, Maron M, Doherty TS, Legge SM, Woinarski JCZ, Garnett ST, Wintle BA, Ritchie EG, Driscoll DA, Lindenmayer D, Adams VM, Ward MS, Carwardine J (2023) Threat-abatement framework confirms habitat retention and invasive species management are critical to conserve Australia’s threatened species. Biological Conservation PDF DOI

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Publications

Fox and cat responses to fox baiting intensity, rainfall and prey abundance in the Upper Warren, Western Australia

Authors: William L Geary, Adrian F Wayne, Ayesha IT Tulloch, Euan G Ritchie, Marika A Maxwell, and Tim S Doherty

Published in: Wildlife Research

Abstract

Context: Invasive predators are major drivers of global biodiversity loss. Red foxes (Vulpes vulpes) and feral cats (Felis catus) have contributed to the decline and extinction of many native species in Australia. The deployment of poison baits to control fox populations is a widespread conservation tool, but the effects of baiting intensity, rainfall and prey abundance on baiting effectiveness remain poorly understood.

Aims: We aimed to understand what influences the association between fox baiting intensity, red fox activity and feral cat activity, to provide inferences about what might affect the effectiveness of fox baiting in reducing fox activity.

Methods: We used generalised linear models to assess how fox and cat activity changes in relation to fox baiting intensity, rainfall, native prey availability and distance to agricultural land over a 6-year period (2006–2013) in the forest ecosystems of the Upper Warren region of south-western Australia.

Key results: We found that fox activity was negatively associated with rainfall in the previous 12 months and positively associated with prey abundance and fox baiting intensity. We also found an interaction between fox baiting and prey abundance, with fox activity increasing with prey activity in areas of low and moderate baiting intensity, but remaining constant in areas of high baiting intensity. Feral cat activity was positively associated with prey abundance and fox baiting intensity. We found no clear relationship between fox and cat activity.

Conclusions: The drivers of the association between fox baiting and fox activity are unclear because intense fox baiting was targeted at areas of known high fox abundance. However, our results indicate that intense fox baiting may be effective at decoupling the positive association between fox activity and prey abundance. Our results also suggest a positive association between fox baiting intensity and feral cat activity, thus supporting the case for integrated fox and cat management.

Implications: We caution interpretation of our results, but note that management of invasive predators could be improved by adjusting the intensity of management in response to changes in environmental conditions and local context (e.g. strategically conducting intense predator management where prey abundance is highest). Improved understanding of these associations requires a monitoring program with sufficient replication and statistical power to detect any treatment effects.

Geary WL, Wayne AF, Tulloch AIT, Ritchie EG, Maxwell MA, Doherty TS (2022) Fox and cat responses to fox baiting intensity, rainfall and prey abundance in the Upper Warren, Western Australia. Wildlife Research PDF DOI