Posted on 03/04/2008 10:51:16 AM PST by blam
Are Wolves The Pronghorn's Best Friend?
Yellowstone pronghorn populations directly benefit from the presence of wolves, a new Wildlife Conservation Society study says. (Credit: Julie Larsen Maher/Wildlife Conservation Society)
ScienceDaily (Mar. 4, 2008) — As western states debate removing the gray wolf from protection under the Endangered Species Act, a new study by the Wildlife Conservation Society cautions that doing so may result in an unintended decline in another species: the pronghorn, a uniquely North American animal that resembles an African antelope.
The study, appearing in the latest issue of the journal Ecology, says that fewer wolves mean more coyotes, which can prey heavily on pronghorn fawns if the delicate balance between predators and their prey is altered. According to the study, healthy wolf packs keep coyote numbers in check, while rarely feeding on pronghorn fawns themselves. As a result, fawns have higher survival rates when wolves are present in an ecosystem.
"People tend to think that more wolves always mean fewer prey," said WCS researcher Dr. Kim Berger, lead author of the study. "But in this case, wolves are so much bigger than coyotes that it doesn't make sense for them to waste time searching for pronghorn fawns. It would be like trying to feed an entire family on a single Big Mac."
Over a three-year period, researchers radio-collared more than 100 fawns in wolf-free and wolf-abundant areas of Grand Teton National Park and monitored their survival throughout the summer. The results showed that only 10 percent of fawns survived in areas lacking wolves, but where coyote densities were higher. In areas where wolves were abundant, 34 percent of pronghorn fawns survived. Wolves reduce coyote numbers by killing them outright or by causing them to shift to safer areas of the Park not utilized by wolves.
While pronghorn are not endangered, the population that summers in Grand Teton National Park, part of the Greater Yellowstone Ecosystem, had been reduced to fewer than 200 animals in recent years. Since wolves were reintroduced in 1995, the pronghorn population in Grand Teton has increased by approximately 50 percent. These pronghorn have the longest migration -- more than 200 miles roundtrip -- of any land mammal in the lower 48 states. The Wildlife Conservation Society has called for permanent protection of their migration corridor, known as "Path of the Pronghorn," to prevent the animals from going extinct in the Park. Representatives from the National Park Service, U.S. Fish and Wildlife Service, and U.S. Forest Service recently pledged support for protecting the corridor.
If delisting occurs, Wyoming and Idaho have announced their intention to reduce wolf number by 50percent and 80 percent, respectively. At present, there are an estimated 300 wolves in Wyoming and 700 in Idaho.
"This study shows just how complex relationships between predators and their prey can be," said Berger. "It's an important reminder that we often don't understand ecosystems nearly as well as we think we do, and that our efforts to manipulate them can have unexpected consequences."
Adapted from materials provided by Wildlife Conservation Society, via EurekAlert!, a service of AAAS.
Next they’ll be trying to tell us that conservatives actually benefit from the current infestation of liberals.
Sounds like a case of intelligent design to me.
General rule of thumb: Whatever facts support greater limits on humans and more protections for critters.
At present, there are an estimated 300 wolves in Wyoming and 700 in Idaho.
For those who argue for States Rights here a prime example of where the states have some common sense and the feds do not.
Montana? reduce the number of wolves by 100% ?
The ESA has no legal provisions to keep a species listed in order to protect another species. A species is proposed for delisting when that species appears to have recovered enough to not require protection. The reduction of the wolf population is a State issue and that’s where WCS should address their concerns.
A few Wyoming bugs.
No. Not if you're an individual pronghorn. As a collective group of pronghorns, perhaps. But we all know what happens to collective society...only the more equal pronghorns survive, living with the wolves, where the wolves eventually eat the remaining pronghorns.
FMCDH(BITS)
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