Public Release: 

Wild yaks -- shaggy barometers of climate change

New study reveals how a warming planet affects male and female yaks differently

Wildlife Conservation Society

  • New study reveals how a warming planet affects male and female yaks differently
  • Study took place in Tibetan plateau atop the "Roof of the World"
  • Authors compared historical data from last two centuries with current observations
  • Findings may influence future conservation planning in this rapidly warming region
  • Study appears in Nature Scientific Reports

NEW YORK (March 4, 2015) - A new study led by WCS (Wildlife Conservation Society), University of Montana, Qinghai Forestry Bureau, Keke Xili National Nature Reserve, and other groups finds that climate change and past hunting in the remote Tibetan Plateau is forcing female wild yaks onto steeper and steeper terrain.

Why? The authors say the key answer is snow, which females need for milk production to nurture their offspring. As the region warms - estimated at two-to-three-times faster than other parts of the planet - snow patches become more and more restricted often in steep post-glacial terrain.

Wild yaks are endangered and serve as living totems for the rugged Tibetan Plateau and the human cultures that live on the "roof of the world."

The authors of the study, which appears in the March 2nd issue of the journal Nature Scientific Reports, include: Joel Berger of the University of Montana and WCS; George Schaller of Panthera; Ellen Cheng of Ugyen Wangchuck Institute for Conservation and Environment; Aili Kang and Lishu Li of WCS; and Michal Krebs and Mark Hebblewhite of the University of Montana.

While many scientists concerned with life at the planet's edge use models to predict future change, the research team led by Dr. Joel Berger conducted ground-based field work during winter in the Keke Xili National Nature Reserve on the Tibetan Plateau. Camping in temperatures as cold as negative 24 degrees Fahrenheit when water is totally frozen and therefore unavailable to wildlife, the team found female yaks were 20 times more likely to be found adjacent to snow patches than male yaks.

In addition, the team analyzed observations of wild yaks extracted from some 60 expeditions of the Tibetan Plateau region from 1850-1925 - travels that included British, French, Swedish, German, Russian, and American explorers. Following these expeditions, wild yaks were widely slaughtered by poachers. Comparing historical records with recent data, the authors found that male and female wild yaks used similar habitat prior to the heavy poaching pressure that began in the 1930s. However, following this spike in hunting, females shifted to areas of steeper inclines suggesting greater sensitivity to hunting and a need to protect their offspring.

"What happens in the Keke Xili National Nature Reserve can provide valuable lessons as conservation planners prepare for similar climate change impact in other parts of the world," said lead author Joel Berger of WCS and the University of Montana. "The twin findings - that the sexes of a cold-adapted species respond differently to modern climate change and long-past exploitation - indicate that effective conservation planning will require knowledge of the interplay between past and future if we will assure persistence of the region's biodiversity."

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This study was made possible through the generous support of blue moon fund and the National Geographic Society Committee for Research and Exploration.

About the Wildlife Conservation Society (WCS)

MISSION: WCS saves wildlife and wild places worldwide through science, conservation action, education, and inspiring people to value nature. VISION: WCS envisions a world where wildlife thrives in healthy lands and seas, valued by societies that embrace and benefit from the diversity and integrity of life on earth. To achieve our mission, WCS, based at the Bronx Zoo, harnesses the power of its Global Conservation Program in more than 60 nations and in all the world's oceans and its five wildlife parks in New York City, visited by 4 million people annually. WCS combines its expertise in the field, zoos, and aquarium to achieve its conservation mission. Visit: http://www.wcs.org; http://www.facebook.com/TheWCS; http://www.youtube.com/user/WCSMedia Follow: @thewcs.

WCS in China: WCS began working on the Tibetan Plateau in the 1980s, and provided technical support for the creation of the massive Changtang reserve. Today WCS's China Program works on: Amur tiger conservation in northeast China; Chinese alligator reintroduction in lower Yangtze River; combating illegal wildlife trade and trafficking in south China; and in 2013, initiated a pilot project to reduce demand in wildlife products.

CONTACT: STEPHEN SAUTNER: (1-718-220-3682; ssautner@wcs.org
JOHN DELANEY: (1-718-220-3275; jdelaney@wcs.org)

Embeddable slideshow: http://youtu.be/-NyfNLKM_u0
Photos: A lone male yak, and a yak herd in the formidable landscape of the Tibetan plateau. Credit: WCS
Study Link: Nature Scientific Reports
Tweet: https://twitter.com/TheWCS/status/573120028565901315

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