WDFW News – Bat-killing disease white-nose syndrome confirmed east of the Cascade Range in Washington.

White-nose syndrome, an often-fatal disease of hibernating bats, has been confirmed for the first time in Washington east of the Cascade Range. Kittitas County is the fourth county in Washington affected by the disease or the causal fungus, joining King, Pierce, and Lewis counties.

The Washington Department of Fish and Wildlife (WDFW) received four dead bats from a landowner outside of Cle Elum this spring. WDFW sent the bats to the U.S. Geological Survey (USGS) National Wildlife Health Center in Madison, WI for testing, where scientists confirmed all four bats had white-nose syndrome. The bat species are either Yuma myotis (Myotis yumanensis) or little brown bats (Myotis lucifugus), two species that are hard to tell apart visually.

Earlier this year, the same landowner alerted WDFW that a large group of bats has lived on their property for over 50 years. Biologists confirmed it was a maternity colony, which is where female bats give birth and nurse their young. In August, scientists counted more than 750 bats at the site.

“We are thankful that this homeowner was a caring steward of these bats and reached out to let us know about the bats on their property, and for reporting the dead bats,” said Abby Tobin, white-nose syndrome coordinator for WDFW. “We rely on these types of tips from the public of sick or dead bats, or groups of bats, to monitor bat populations and track the spread of this deadly bat disease.”

White-nose syndrome is harmful to hibernating bats, but does not affect humans, livestock, or other wildlife.

In 2016, scientists first documented white-nose syndrome in Washington near North Bend in King County. Since then, WDFW has confirmed 34 cases of the disease in three bat species in the state. A timeline of fungus and white-nose syndrome detections in Washington is available online at https://wdfw.wa.gov/bats.

First seen in North America in 2006 in eastern New York, white-nose syndrome has killed millions of bats in eastern North America and has now spread to 33 states and seven Canadian provinces.

The disease is caused by the fungus Pseudogymnoascus destructans, which attacks the skin of hibernating bats and damages their delicate wings, making it difficult to fly. Infected bats often leave too early from hibernation, which causes them to lose their fat reserves and become dehydrated or starve to death.

As predators of night-flying insects, bats play an important ecological role in preserving the natural balance of your property or neighborhood. Washington is home to 15 bat species that benefit humans by eating tons of insects that can negatively affect forest health, commercial crops, and human health and well-being.

About Pete Heley

Writes and self-publishes Oregon and Washington fishing books.
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