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Fewer wolves may mean fewer pronghorn in Yellowstone WCS March 3, 2008
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."
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 50 percent 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."
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