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New mammal species identified in Australia

In the current crisis of global biodiversity loss, the discovery of new species is a welcome addition. But the recent finding that the mountain brushtail possum, an arboreal marsupial mammal of Australian wet forests, is actually made up of two species also poses new conservation challenges.

The new possum species is proposed in an article in the latest Australian Journal of Zoology (Volume 50, Issue 4), authored by Earthwatch-supported biologist Dr. David Lindenmayer (Australian National University) and colleagues. "Geographic dimorphism in the Mountain Brushtail Possum (Trichosurus caninus) - the case for a new species," describes how the northern and southern populations of the mountain brushtail possum are both morphologically and genetically distinct.

"This article represents the last 10 years of data on the genetics and morphology of mountain brushtails where we have worked on them," said Lindenmayer, principal investigator of the Earthwatch-supported Australia's Forest Marsupials project. "We knew we had two species on our hands last year when we got the genetic data to add to the morphology data."

A hiker in the woods might not distinguish the two species, says Lindenmayer, but northern mountain brushtails in the forests of New South Wales and Queensland have smaller ears, shorter feet, and a longer, brushier tail than those in Victorian forests to the south. Although there is variability in both populations, years of morphological data collected by Lindenmayer and colleagues confirm that these differences are statistically significant.

Genetic distances of 2.7% to 3% between the southern and northern populations of mountain brushtails further support their species status. Genetic data was collected last year when the scientists were investigating biological controls for the related common brushtail.

"We were trying to find a parasite or disease in mountain brushtail to help control closely related common brush
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Contact: Blue Magruder
bmagruder@earthwatch.org
978-450-1209
Earthwatch Institute
22-Nov-2002


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