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!
How does the loss of species alter ecosystems?
18.05.2017 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Excess diesel emissions bring global health & environmental impacts
16.05.2017 | International Institute for Applied Systems Analysis (IIASA)
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.
In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
24.05.2017 | Physics and Astronomy
24.05.2017 | Physics and Astronomy
24.05.2017 | Event News