Cane-toad sausages fed to quolls to save lives
16 February 2010
In an innovative effort to save endangered quolls from extinction, Stephanie O'Donnell, in her Honours research in the School of Biological Sciences at the University of Sydney, is feeding them poisonous cane toad sausages.
The sausages, made from minced cane toad legs, are laced with a chemical designed to make the quolls feel sick. After their unpleasant experience with the sausages, quolls are likely to avoid eating poisonous cane toads in the wild. Research has suggested that a quarter of quolls will avoid eating a cane toad if they have sampled one of these sausages.
O'Donnell completed the research as part of her Honours year with Professor Rick Shine, whose lab focuses on evolutionary ecology in reptiles. According to Professor Rick Shine, ARC Federation Fellow, O'Donnell's research is invaluable to the ensuring the future of Australia's quolls.
"Quolls have largely disappeared from the areas where cane toads occur," he explains. "We know from Stephanie's work that if you don't train quolls to leave toads alone they're very likely to eat the first toad they encounter and die as a result."
Cane toads, which use poisonous glands in their back as a defence against predators, are rapidly spreading across the quoll's natural habitat. O'Donnell's research for the Shine Lab (in co-operation with the Territory Wildlife Park and the Federal Government's Caring for our Country initiative) aims to tackle the threat of cane toads to quolls by training their predators rather than controlling the cane toad population.
"The big picture story is that in trying to save the wildlife from cane toads just about all of the effort has gone into controlling the cane toad population," Professor Shine says.
In contrast, O'Donnell's research employs a more feasible strategy of training quolls before cane toads arrive, allowing them to colonise the area before the new threat is introduced.
"We have to come up with something we can do immediately that doesn't rely on getting rid of every toad. Changing the behaviour of the predators is the new approach and so far the results are really encouraging," says Professor Shine.
Contact: Katynna Gill
Phone: 02 9351 6997