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Recovery efforts not enough for critically endangered Asian vulture
Date:9/5/2008

in the population also is likely to dwindle. This is a concern, Johnson said, because a population's genetic diversity reflects its ability to adapt to environmental challenges such as changing climate or outbreaks of disease. Without the ability to adapt, populations and whole species may become extinct.

Johnson and coworkers used museum specimens collected before the decline began, along with recent feather and tissue samples from birds in Pakistan's last remaining wild breeding colony, to see how genetic diversity in the wild population has changed as the population has plummeted. Then, assuming captive populations of various sizes, they used computer simulations to determine how large captive populations must be to preserve genetic diversity.

The analysis showed that while there was still a fair amount of genetic diversity in the wild population two years ago when their last samples were obtained, current captive populations are not large enough to maintain that diversity if the wild populations are wiped out---a fate that seems inevitable if people keep using diclofenac. The simulation results also suggest that levels of genetic diversity in the wild may already be in decline.

"We know the problem, and we know the solution," said Johnson, who was an assistant research scientist at U-M when the research was done and recently accepted a position as an assistant professor at the University of North Texas in Denton. "We just need to get diclofenac out of the environment and more birds into protection before it is too late."

The Peregrine Fund, a organization that works to conserve birds of prey in nature, is trying to prevent the birds' extinction, but it's an effort that requires money and international cooperation, both of which can be problematic in the vultures' home countries.

"One of my goals with this paper," Johnson said, "is to raise awareness of the problem and to increase political will in India and Pakistan
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Contact: Nancy Ross-Flanigan
rossflan@umich.edu
734-647-1853
University of Michigan
Source:Eurekalert  

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