A new study led by the Wildlife Conservation Society says that in wild yak societies, it's the mothers that are the real climbers. The study found that mothers with young venture on steeper terrain and slightly higher elevation than either males or females without young.
The authors of the study expect that this strategy is an adaptive way to avoid predators and to access more nutritious food. Wild yaks are an endangered species occurring only on the Tibetan Plateau and closely related to North American bison.
These are wild yak females in their extremely rugged habitat in far western China.
Credit: Wildlife Conservation Society
The study, which appears in the June issue of the Journal of Mammalogy is authored by Joel Berger of the Wildlife Conservation Society and the John J. Craighead professor at University of Montana; Ellen Cheng of the Ugyen Wangchuck Institute for Conservation and Environment; Aili Kang of WCS; Michael Krebs of the University of Montana; Lishu Li of Beijing; Zhao Xin Lu and Buqiong Buzhou of Kekexili National Nature Reserve Management Bureau; and George Schaller of WCS and Panthera.
The study reported that wild yak females are found on mountainous slopes averaging 15,994 feet and in groups of about 30 whereas males were more frequently in valley bottoms and groups of just two.
Wild yaks are the largest grazer north of the tropics; while weights are rarely known, they are larger than bison. Domestic yaks were once bred with bison in northern Canada in the 1920's in an attempt to make for more cold-hearty animals.
The authors of the study say that the remoteness of the wild yak's habitat gives conservationists an opportunity to study a species that has not been largely impacted by humans. Bison on the other hand, have been greatly impacted by human activity and habitat fragmentation. Their ability to range in higher elevations has been largely lost although skulls have been found in the Rocky Mountains above 12,000 feet in Utah, Colorado, and Wyoming.
Lead author Joel Berger of WCS and University of Montana said: "Neither habitat destruction nor fragmentation are issues in the yak's home in far western China, and so there are amazing opportunities to learn about why males and females respond differently to climate change and biological challenges.
But, more fundamentally, just as people climb mountains in the Himalayas because they are there, here we have a throwback to the Pleistocene; it is still here, and we by uniting people from different countries have the opportunity to conserve a species, not to mention an ecosystem and a landscape that is larger than all of Montana and Nebraska combined."
This research was made possible through the generous support of the National Geographic Society and U.S. National Park Service.
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.
Stephen Sautner | Eurek Alert!
Analytical lamps monitor air pollution in cities
26.05.2015 | Heraeus Noblelight GmbH
Nordic forests under pressure
26.05.2015 | International Institute for Applied Systems Analysis (IIASA)
Physicists have developed an innovative method that could enable the efficient use of nanocomponents in electronic circuits. To achieve this, they have developed a layout in which a nanocomponent is connected to two electrical conductors, which uncouple the electrical signal in a highly efficient manner. The scientists at the Department of Physics and the Swiss Nanoscience Institute at the University of Basel have published their results in the scientific journal “Nature Communications” together with their colleagues from ETH Zurich.
Electronic components are becoming smaller and smaller. Components measuring just a few nanometers – the size of around ten atoms – are already being produced...
Development and implementation of an advanced automobile parking navigation platform for parking services
To fulfill the requirements of the industry, PolyU researchers developed the Advanced Automobile Parking Navigation Platform, which includes smart devices,...
The world's first electrical car and passenger ferry powered by batteries has entered service in Norway. The ferry only uses 150 kWh per route, which...
On Tuesday, 19 May 2015 the research icebreaker Polarstern will leave its home port in Bremerhaven, setting a course for the Arctic. Led by Dr Ilka Peeken from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) a team of 53 researchers from 11 countries will investigate the effects of climate change in the Arctic, from the surface ice floes down to the seafloor.
RV Polarstern will enter the sea-ice zone north of Spitsbergen. Covering two shallow regions on their way to deeper waters, the scientists on board will focus...
Nanoengineers at the University of California, San Diego developed a gel filled with toxin-absorbing nanosponges that could lead to an effective treatment for skin and wound infections caused by MRSA (methicillin-resistant Staphylococcus aureus), an antibiotic-resistant bacteria. This "nanosponge-hydrogel" minimized the growth of skin lesions on mice infected with MRSA - without the use of antibiotics. The researchers recently published their findings online in Advanced Materials.
To make the nanosponge-hydrogel, the team mixed nanosponges, which are nanoparticles that absorb dangerous toxins produced by MRSA, E. coli and other...
20.05.2015 | Event News
18.05.2015 | Event News
12.05.2015 | Event News
26.05.2015 | Ecology, The Environment and Conservation
26.05.2015 | Life Sciences
26.05.2015 | Power and Electrical Engineering