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

ot appear to be enough to reduce transmission rates."

Even solitary roosting habits may not be enough to save some species, such as the northern long-eared bat. Although it declined less rapidly as its colonies got smaller, 14 populations of northern long-eared bats became locally extinct within two years after the detection of white-nose syndrome, and no populations remained in the study area after five years. In contrast, the populations of tri-colored bats, another solitary species, stabilized at low levels three to four years after disease detection. "The northern long-eared bats may be particularly susceptible to the disease, so they continue to get hit pretty hard even after transmission rates are reduced," Langwig said.

The two species least affected by white-nose syndrome, big brown bats and eastern small-footed bats, are mostly solitary, although occasionally they roost in small clusters. It is not clear why they have been less affected by the disease than other species, Langwig said.

According to Kilpatrick, one possibility is that these species roost in sites where conditions are less conducive to the disease. The study examined the influence of different microclimates within hibernation sites and found that declines were less severe in the drier and cooler sites. "It appears that the driest and coolest caves may serve as partial refuges from the disease," Kilpatrick said.

In addition to Langwig and Kilpatrick, the coauthors of the paper include Winifred Frick, a researcher in ecology and evolutionary biology at UC Santa Cruz; Jason Bried, a graduate student at Oklahoma State University; Alan Hicks of the New York State Department of Environmental Conservation; and Thomas Kunz of Boston University.

Much of the bat population data used in the study was collected in surveys conducted by state agencies during the past 40 years. This research was funded by the National Science Foundation, Bat Conservation Intern
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Contact: Tim Stephens
stephens@ucsc.edu
831-459-2495
University of California - Santa Cruz
Source:Eurekalert

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