A changing climate means that by 2070 koalas may no longer call large parts of inland Australia home, researchers have found.
Using a detailed ecological model, the University of Melbourne study shows hotter temperatures and altered rainfall patterns will make it much more difficult for koalas to get the water they need – making inland populations vulnerable to heat-stress.
The researchers mapped potential koala habitats in 2070 by using information about koala behaviour, physiology, body size, and fur to predict how much energy and water koalas need to survive under the climate at a particular location. They found that the climatically suitable area dramatically reduced by 2070, particularly in Queensland. The koala’s range across Australia was limited by water requirements for keeping cool, with the timing of rainfall and heat waves being crucial in limiting the koala in the warmer parts of its range.
Lead author of the study Dr Natalie Briscoe from the School of BioSciences, University of Melbourne says that the findings could help our ability to forecast future impacts of climate change on biodiversity.
“Studies of climate change impacts on wildlife have often focused on how changes in average temperature or rainfall will affect species, but our research highlights the importance of thinking about the extreme conditions that will be most stressful for the animals – such as hot, dry periods – and how these may change in the future.
“By developing a better understanding of what controls species distributions now, we are much better placed to forecast how these may shift in the future” says Dr Briscoe.
Dr Brendan Wintle, Deputy Director of the National Environmental Science Programme’s Threatened Species Recovery Hub, and a co-author of the study, says describing where koalas and other threatened species find refuge from changing climate and other threats such as cats and foxes allows efficient focus of conservation efforts and limited conservation funding.
The study is published in the current issue of Global Change Biology http://onlinelibrary.wiley.com/doi/10.1111/gcb.13280/abstract .
To build the ecological model the team compiled data on how koalas behave under different weather conditions, measured characteristics such as fur depth and body size from across the koala’s range, and collated detailed data on koala physiology. They could then predict the koalas' habitat from a climatic point of view based only on their water and energy requirements, assuming that eucalyptus trees were available everywhere.
The team also used models that correlate known koala locations with the climatic conditions of the recent past – the approach most commonly used to predict climate change impacts on wildlife, but one which could be misleading when projected to the future.
They found that both kinds of models made accurate predictions of the koala’s current range and agreed that koalas will disappear from much of the drier, hotter parts of their range.
“There is a lot of uncertainty when predicting the impacts of climate change on species, particularly when climate change leads to novel weather patterns. Comparing predictions from different models allows us to more confidently predict the location of havens where koalas could survive in the future” says Dr Briscoe.
The Threatened Species Recovery Hub brings together Australia’s leading conservation scientists to help develop better management and policy for conserving Australia’s threatened species.
It is supported by the Australian Government ’s National Environmental Science Programme, a long-term commitment to support environmental and climate research.
For more information:
Susan McNair, Threatened Species Recovery Hub communications coordinator: email@example.com or 0439 389 202
Dr Natalie Briscoe: firstname.lastname@example.org
Image courtesy of Colin Briscoe.
No species is too small, too ugly or too remote to be beyond saving, according to a national compilation and review of almost 50 successful examples of threatened species recovery in Australia. The review has just been published...
We are offering an opportunity to undertake a PhD that will improve conservation outcomes for the northern bettong by investigating the ecological impacts of cat predation and fire. Based at the University of Queensland and jointly supervised by Qld State Government staff. Come and join the TSR Hub team.
Conservation managers considering the implementation of nest boxes programs need to give careful consideration to design, colour, placement and shade profile of nest boxes.
The vast brigalow forest that extended from northern New South Wales to southern Queensland has been cleared in the space of 60 years and it seems that many species have become threatened as a result. Rod Fensham and co-workers have identified the plant species that are likely to have become threatened and many of these species were not previously recognised as imperilled.
The TSR Hub has gathered monitoring experts, and managers who need and use monitoring information, from all over Australia to discuss the value of, and many challenges involved in, monitoring threatened biodiversity. This had led to a national assessment of the adequacy of threatened species monitoring in Australia, a framework to guide and assess monitoring programs and a new authoritative book.