Culling can't control deadly bat disease

Feb 14, 2011
A mathematical model has found culling to be an ineffective strategy for controlling the deadly white-nose syndrome, a disease that has killed an estimated one million bats in North America. Credit: Photo courtesy Ryan von Linden/New York Department of Environmental Conservation

Culling will not stop the spread of a deadly fungus that is threatening to wipe out hibernating bats in North America, according to a new mathematical model.

White-nose syndrome, which is estimated to have killed over a million in a three year period, is probably caused by a newly discovered cold-adapted fungus, Geomyces destructans. The new model examines how WNS is passed from bat to bat and concludes that culling would not work because of the complexity of bat life history and because the occurs in the caves and mines where the bats live.

"Because the disease is highly virulent, our model results support the hypothesis that transmission occurs in all contact areas," write the paper's authors, Tom Hallam and Gary McCracken, both of the University of Tennessee. "Our simulations indicated culling will not control WNS in bats primarily because contact rates are high among colonial bats, contact occurs in multiple arenas, and periodic movement between arenas occurs."

Ground work on the model was initiated in a 2009 modeling workshop on white-nose syndrome held at the National Institute for Mathematical and (NIMBioS) in Knoxville, Tennessee. At the interdisciplinary workshop, experts in the fields of bat physiology, fungal ecology, ecotoxicology, and epidemiology discussed ways in which mathematical modeling could be applied to predict and control the spread of WNS.

"NIMBioS' support for the workshop that initiated this project was crucial in helping formulate models that could be useful in looking at white-nose syndrome," Hallam said.

Culling of bats in areas where the disease is present is one of several options that have been considered by state and federal agencies as a way to control the disease. However, a review of management options for controlling WNS in the paper indicates that culling is ineffective for disease control in wild animals and in some cases, can exacerbate the spread.

White-nose syndrome first appeared in a cave in upstate New York in 2006, and has since spread to 14 states and as far north as Canada. Regional extinctions of the most common bat species, the little brown bat, are predicted within two decades due to WNS.

Eating up to two-thirds of their body weight in insects every night, bats help suppress insect populations ultimately reducing crop damage and the quantities of insecticides used on crops. Bats also play an important ecological role in plant pollination and seed dissemination.

Explore further: The influence of the Isthmus of Panama in the evolution of freshwater shrimps in America

More information: Hallam TG, McCracken GF. 2011. Management of the panzootic white-nose syndrome through culling of bats. Conservation Biology 25(1): 189-194.

Provided by National Institute for Mathematical and Biological Synthesis

not rated yet
add to favorites email to friend print save as pdf

Related Stories

Scientists unravel the mystery of white-nose syndrome

Jun 03, 2009

The mysterious disease that has killed more than 90 percent of wintering bats in some caves and mines from Vermont to Virginia during the last three years has raised numerous questions about the nature of the disease and ...

Interim protections sought for little brown bats

Dec 20, 2010

Scientists and conservation groups filed a formal request today asking the U.S. Fish and Wildlife Service to determine if little brown bats, once the most common bat species in the Northeast, need protection under the Endangered ...

Battling a bat killer

Nov 17, 2010

Scientists are looking for answers -- including commercial bathroom disinfectants and over-the-counter fungicides used to fight athlete's foot -- to help in the battle against a strange fungus that threatens bat populations ...

Recommended for you

Dogs hear our words and how we say them

10 hours ago

When people hear another person talking to them, they respond not only to what is being said—those consonants and vowels strung together into words and sentences—but also to other features of that speech—the ...

Amazonian shrimps: An underwater world still unknown

11 hours ago

A study reveals how little we know about the Amazonian diversity. Aiming to resolve a scientific debate about the validity of two species of freshwater shrimp described in the first half of the last century, ...

Factors that drive sexual traits

13 hours ago

Many male animals have multiple displays and behaviours to attract females; and often the larger or greater the better.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.