Scientists urge reassessment of threatened species after Australian bushfires – Mongabay.com

Scientists urge reassessment of threatened species after Australian bushfires – Mongabay.com

  • A new paper suggests that the 2019-2020 Australian bushfires impacted critical habitats of more than 800 native species, with 70 species losing more than 30% of their natural range.
  • The bushfires may have led to a 14% increase in threatened species, according to the study.
  • The researchers recommend an urgent assessment of threatened species via the Australian government’s Environment Protection and Biodiversity Conservation (EPBC) Act, which classifies threatened species and provides legal protection for them.
  • Other actions may be needed to help preserve native wildlife populations, such as invasive species management, captive-breeding programs, and the protection of fire-burned regions to aid recovery, the researchers suggest.

Between 2019 and 2020, turbulent bushfires ripped through Australia, turning green forests into ash, and producing plumes of smoke that hovered over the country like a shroud. While the flames have been extinguished for several months now, scientists are still scrambling to understand the full impact on the country’s native wildlife.

A new paper published in Nature Ecology & Evolution estimates that the bushfires burned through about 97,000 square kilometers (37,500 square miles) of vegetation in southern and eastern Australia, equivalent to 18 million football fields, or an area bigger than Portugal. The fire-impacted regions included critical habitat for 832 species of native vertebrate fauna, including 378 birds, 254 reptiles, 102 frogs, 83 mammals and 15 freshwater fish, according to the study.

A lone wallaby foraging for food in a burned forest outside Mallacoota. Image by Jo-Anne McArthur / We Animals.

“This figure doesn’t include invertebrates or plants, so while a huge amount of species, severely underplays the impact of just one fire event,” lead author Michelle Ward, a researcher at the University of Queensland, told Mongabay in an email.

According to the study, 70 species had more than 30% of their habitat burned, with some species losing more than 80% of their natural territory. Of these 70 species, 21 are already threatened with extinction, including the Kangaroo Island dunnart (Sminthopsis aitkeni) and long-footed potoroo (Potorous longipes), both mouse-sized marsupials.

Ward and her colleagues say the bushfires likely caused a 14% increase in the number of threatened species, and have called for an urgent assessment of these species via Australia’s Environment Protection and Biodiversity Conservation (EPBC) Act, a piece of legislation that classifies threatened species and subspecies, and provides a legal framework for their protection.

Species not currently listed as threatened, but that may need assessment under the EPBC Act, include Kate’s leaf-tailed gecko (Saltuarius kateae), the short-eared possum (Trichosurus caninus), and Littlejohn’s tree frog (Litoria littlejohni), the study suggests.

Southern Cross Wildlife Care’s triage unit for burn victims sets up in a hotel room in Merimbula, New South Wales. Image by Jo-Anne McArthur / We Animals.

“It’s important to remember that many of the animals impacted by these fires were already declining in numbers because of habitat destruction, drought, disease, and invasive species,” Ward said. “These fires are just another nail in the coffin for many of our native species.”

Ward said some independent and government-funded surveys are already underway, but the process of getting listings updated via the EPBC Act can be a lengthy process, sometimes taking more than two years. However, Ward says she and her team have been in “constant communication” with the Australian government about this matter.

A spokesperson for the Australian government’s Department of Agriculture, Water and the Environment told Mongabay it has established the Wildlife and threatened species bushfire recovery Expert Panel to help guide recovery actions for native species impacted by the fires, and it was already engaging with the Threatened Species Scientific Committee, which is responsible for amending and updating lists of threatened species. Additionally, the government said it had invested $200 million to support bushfire recovery for native wildlife and their habitat.

“The bushfires have had a significant impact on native plants and animals, and it is likely that species which were not previously considered threatened with extinction are now at risk as a result of the fires, while other species, which were previously considered threatened, are likely to now be at greater risk of extinction,” the spokesperson said.

A short-eared brushtail possum at Lamington National Park, Queensland, Australia. Image by Donald Hobern / Flickr.

Another team of researchers recently released an interim report, stating that nearly 3 billion animals had died in the fires, including  143 million mammals, 2.46 billion reptiles, 180 million birds, and 51 million frogs. These numbers are much higher than previous estimates of 1 billion animals dying in the fires.

“It is quite likely the fires would have caused some extinctions, but we won’t know until after the surveys,” Ward said.

The EPBC Act currently lists 202 faunal species as threatened, 164 as endangered, and 89 as critically endangered. Fifty-five faunal species are already listed as extinct.

Ward says native species may need a “range of strategic post-fire management actions to maintain and recover their populations” following the bushfires, including invasive species management and captive-breeding programs. It’s also important to protect fire-burned areas from salvage logging and other destructive activities that can disrupt an ecosystem’s ability to recover, she said.

A long-footed Potoroo at Healesville Sanctuary in Victoria, Australia. Image by George Bayliss / Flickr.

With the next bushfire season right around the corner, study co-author James Watson, director of the science and research initiative at the Wildlife Conservation Society (WCS) and professor at the University of Queensland’s School of Earth and Environmental Sciences, said it’s important to learn how to better manage forests to reduce fire risk and protect threatened species.

“While fire is a crucial aspect of many ecosystems, we’re witnessing climate change-induced drought combined with land use management practices that make forests more fire prone,” Watson said in a statement. “We need to learn from these events as they are likely to happen again.”

Citation:

Ward, M., Tulloch, A. I., Radford, J. Q., Williams, B. A., Reside, A. E., Macdonald, S. L., … Watson, J. E. (2020). Impact of 2019-2020 mega-fires on Australian fauna habitat. Nature Ecology & Evolution. doi:10.1038/s41559-020-1251-1

Banner image caption: A mother koala and her joey who survived the forest fires in Mallacoota. Australia, 2020. Image by Jo-Anne McArthur / We Animals.

Elizabeth Claire Alberts is a staff writer for Mongabay. Follow her on Twitter @ECAlberts.

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