An Australian study has blamed feral cats for the extinction of native mammals and warns 100 species are under threat from the creatures that inhabited the homes of early British settlers.
The Action Plan for Australian Mammals, compiled over three years, found a higher than previously known rate of mammal extinction, co-author John Woinarski of Charles Darwin University said yesterday.
Australia’s mammal extinction rate was the highest in the world, with more than 10 percent of species — 29 mammal fauna — wiped out since Europeans settled the country two centuries ago, he said.
“At least one, and probably two, Australian mammals have been made extinct in the last decade, and if current trends continue many of the 55 threatened species will disappear within our lifetimes,” he said, adding that even animals such as the koala were in “serious decline.”
“If we had to choose one key action to conserve Australia’s biodiversity it would be the control or eradication of feral cats, which currently threaten at least 100 mammal species,” he said.
The 1,038-page review, released this week, is the first comprehensive assessment of the conservation status of all Australian mammals.
It said while feral cats were the main culprits, feral foxes were also responsible for killing mammals. Other factors contributing to the extinctions included climate change, fire and habitat destruction.
Cats were first introduced to Australia by British immigrants in the 1790s as domestic pets, and were also used to control the rat populations in the ships they arrived on, Woinarski said.
“They went wild very soon after their initial introduction to Australia but it took about 50 to 100 years for them to spread across the continent,” he said.
“Now there’s probably between 10 and 20 million feral cats in Australia,” he said.
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