作者: HAROLD D. PICTON
DOI: 10.1038/274888A0
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摘要: CONTROVERSY surrounds the conflicts between requirements of human safety and preservation grizzly bears (Ursus arctos horribilis) in western North America. It has been difficult to separate effect factors such as closure garbage dumps from that climate. also proved relate climatic data changes populations large mammals. I report here a correlation change with fluctuations sizes litters born Yellowstone National Park, Wyoming, during 1958–1976. The decrease litter observed since seems be largely consequence unfavourable weather periods final fattening mother, winter sleep, birth, lactation early spring foraging. This study represents one few times effects climate have demonstrated for omnivorous or carnivorous