Credit: TORSTEN BLACKWOOD / AFP
SYDNEY: Global warming could shrink the habitat of Australia's duck-billed platypus by a third, researchers have warned, with hotter, drier temperatures threatening its survival.
A confusion of bird, mammal and reptile characteristics, the timid platypus is one of Australia's most cryptic creatures, feeding at night and living in deep waterside burrows to dodge predators such as foxes and eagles.
But its thick, watertight fur coat - one of the key tools to ensuring its survival in the cool depths of rivers and waterholes - could spell disaster in a warming climate, according to a new study from Monash University.
Worst-case scenario
Using weather and platypus habitat data stretching back more than 100 years, researchers were able to map declines in particular populations in connection with droughts and heat events.
The team then extrapolated their findings across a range of climate change scenarios laid out by the government's science research agency, CSIRO, to model how global warming would affect the unusual native species.
"Our worst case scenario at the moment suggested a one-third reduction in their suitable habitat," said researcher Jenny Davis of the work published in the journal Global Change Biology.
Restricted to islands
Other human impacts, including land clearing and the damming of waterways for hydroelectric projects, had and would continue to diminish platypus homes, she added.
"Under a drying climate we'll be taking more water away from the environment because of our human needs, and predators are going to become more of an issue for (the) platypus," she said.
The most dire predictions suggested the platypus would disappear from Australia's mainland entirely, able only to live on southern King, Kangaroo and Tasmania islands, said Davis.
Another warning sign
Davis said the nocturnal creature already appeared to be responding to increases in Australia's average temperature, with certain populations shrinking from the 1960s, when a warming trend first became evident.
"Compared with 50 years ago some places have become too warm for them, their habitat is shrinking," she said, but added that the platypus was not yet considered endangered.
Davis said the potential demise of the platypus was "just another warning sign" of global warming's impact on Australia's unique wildlife.
Wrong animals
Foxes and eagles are not exactly plentiful in Australia: they are North American animals.
just wrong
Foxes certainly are plentiful in Australia - the European red fox was introduced in 1845 and they are everywhere. As for eagles,Australia has several native species, which sadly are less plentiful than foxes, but which are still important predators.