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Asia's third largest animal may be on the rebound
January 17, 2013
Wild yaks cross the Tibetan Plateau near the edge of a glacier. A scientific team recently counted more than a thousand wild yaks in this region signaling a possible comeback for this species once decimated by over-hunting. Photo by: Joel Berger, WCS/University of Montana.
"Wild yaks are icons for the remote, untamed, high-elevation roof of the world," said Joel Berger with WCS who led the expedition. "While polar bears represent a sad disclaimer for a warming Arctic, the recent count of almost 1000 wild yaks offers hope for the persistence of free-roaming large animals at the virtual limits of high-altitude wildlife."
The story of the wild yak is similar to that of another megafauna, the American bison. Like the bison, wild yak were once abundant across much of Asia until overhunting decimated the species, leading to local extinction in many of its haunts, including Nepal, Russia, Kazakhstan, Mongolia, and Bhutan. Now, the animal hangs on in just a few spots, most importantly, on the Tibetan plateau. Still, poaching, competition with livestock, and breeding with common yak continue to threaten its survival.
Berger and his team counted 990 yaks in China's Hoh Xil Nature Reserve, a significant number according to the team and a sign that recent conservation efforts may be making good. The wild yak is currently listed as Vulnerable by the IUCN Red List, though few systematic population counts have been conducted.
"For millennia, yaks have sustained human life in this part of Asia, it would be a cruel irony if their reward is extinction in the wild," noted Joe Walston, WCS Executive Director of Asia Programs.
Unlike most of the world's large mammals, almost nothing is known about wild yaks: including how often they breed, mortality rates for infants, and the role wolves—their biggest predator after humans—play in their populations. But given that the last strong population survive on the top of the world, where glaciers and alpine meadows are still found, a rising threat to the species may be climate change. In the future, Berger and his team plan to study how climate change may impact the Tibetan plateau while also looking more closely at wildlife-human conflict in the region.
Wider view of wild yaks. Photo by: Joel Berger, WCS/University of Montana.
Original source: http://news.mongabay.com/2013/0117-hance-wildyaks.html
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