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Social bats pay a price with new fungal disease
Date:7/3/2012

SANTA CRUZ, CA--The impact on bat populations of a deadly fungal disease known as white-nose syndrome may depend on how gregarious the bats are during hibernation. Species that hibernate in dense clusters even as their populations get smaller will continue to transmit the disease at a high rate, dooming them to continued decline, according to a new study led by researchers at the University of California, Santa Cruz. One gregarious species has surprised researchers, however, by changing its social behavior.

White-nose syndrome has decimated bat colonies throughout the northeast since it first appeared in New York state in 2006, and it continues to spread in the United States and Canada. In the new study, researchers analyzed population trends in six bat species in the northeast. They found that some bat populations are stabilizing at lower abundances, while others appear headed for extinction. The study, published July 3 in Ecology Letters, examined data from bat surveys between 1979 and 2010, covering a long period of population growth followed by dramatic declines caused by white-nose syndrome.

"All six species were impacted by white-nose syndrome, but we have evidence that the populations of some species are beginning to stabilize, which is really good news," said Kate Langwig, a graduate student at UC Santa Cruz and first author of the paper. "This study gives us an indication of which species face the highest likelihood of extinction, so we can focus management efforts and resources on protecting those species."

The bats hibernate during the winter in caves and abandoned mines, and the number of bats can vary tremendously from one site to another. The fungus that causes white-nose syndrome grows on the exposed skin of hibernating bats, disrupting their hibernation and causing unusual behavior, loss of fat reserves, and death.

Langwig and her coauthors looked at how steeply the bat populations at each site d
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Contact: Tim Stephens
stephens@ucsc.edu
831-459-2495
University of California - Santa Cruz
Source:Eurekalert

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