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Australia's endangered bettong reveals how weather effects species distribution
Date:10/6/2011

Australian scientists studying the reliability of species distribution models for revealing the response of animals to climate change have focused their research on the endangered marsupial, the Northern Bettong. The research, published in Ecography demonstrates that studying weather events, rather than the gradual changes of the climate, offers a clearer insight into the Bettong's movements, range boundaries and likely contact with competitors.

"Scientists often use Species Distribution Models (SDM) to predict how an animal will respond to a changing habitat by describing its distribution in relation to the average climate in the location the species is found," said Brooke Bateman from James Cook University Australia. "However these models fail to take weather events into account, even though short-term changes to temperature and rainfall may cause a species to change its behaviour or even move location."

To understand the importance of weather the team turned to two of Australia's marsupial species the endangered northern bettong (Bettongia tropica) and its rival the rufous bettong (Aepyprymnus rufescens). The endangered bettong is only found in three locations in the woodlands and forests of Queensland in Northern Australia, where rainfall is high and the environment is suitable for its primary food source, truffles.

The rufous bettong lives in habitat across a board range of temperature and rainfall. Both species are known to occupy the same areas within the drier end of the northern bettongs range, but rarely at the same time.

The team used occurrence records for both species and compared them to climate variables and extreme weather events such as droughts and heatwaves, which affect the bettong's food source and could result in short-term change of behaviour and distribution.

The results showed that the endangered bettong occurred in smaller numbers in areas that were more likely to exp
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Contact: Ben Norman
Lifesciencenews@wiley.com
44-124-377-0375
Wiley-Blackwell
Source:Eurekalert  

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