Nasty fungus may be killing thousands of bats:
The disease is affecting all six species of hibernating cave bats in the northeastern United States — little brown bats, big brown bats, northern bats, tricolored bats, Indiana bats and the small-footed myotis, Blehert said.At least 100,000 and perhaps as many as 200,000 bats have died since the so-called white-nose syndrome linked to the fungus first appeared in the winter of 2006–2007, he said.
The fungus was found to have colonized the skin of about 90 percent of the 117 bats examined after they died.
Migratory tree bats, which live in the same region but fly to warmer locales in the winter rather than hibernating in caves, have not been affected, Blehert added.
Based on bat population counts done in two caves in New York state, the disease may be killing off more than three quarters of the winged mammals as they hibernate.
The culprit may be a previously unknown species of the fungi genus Geomyces, which is present in soil and eats organic matter. The new one thrives in temperatures like those seen in caves, 36 to 59 degrees Fahrenheit (2 to 15 degrees Celsius).
The scientists said they have not yet determined whether this fungus is the only factor in the bat deaths. Most of the bats also are emaciated.
They are trying to learn whether the disease emerged because the fungus somehow was introduced into the caves, or whether it already was there and began harming bats only after the animals were weakened by some other unknown cause.
The researchers likened the threat to that posed by another fungus that causes a skin infection and is linked to large declines in amphibian populations globally.