共查询到20条相似文献，搜索用时 31 毫秒
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Morrow JH 《Science (New York, N.Y.)》1984,224(4650):719-720
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Westfall RS 《Science (New York, N.Y.)》1987,237(4818):1059-1060
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Stent GS 《Science (New York, N.Y.)》1987,236(4804):990-992
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Donnelly WH 《Science (New York, N.Y.)》1985,230(4726):657-658
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Adams DB 《Science (New York, N.Y.)》1979,205(4411):1155-1158
Two North American fossil species of large felids, hitherto regarded as Late Cenozoic pumas (mountain lion), are in fact closely related to the living cheetah, Acinonyx, of Africa and Eurasia. A new subgenus (Miracinonyx) is proposed for the American species. Cheetahs and pumas may have had a common ancestor in the Miocene of North America. 相似文献
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Fisheries scientists have long identified the factors implicated in salmon decline as the "four H's": hydropower dams, harvesting, habitat degradation, and hatchery misuse. According to a new plan by nine federal agencies, known as the "All-H Paper," improvements in the other three H's will provide benefits that are more certain and widespread than those from dam breaching. But addressing the other H's may be even more costly than breaching dams. 相似文献
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Van Dressser P 《Science (New York, N.Y.)》1966,151(3713):936-938
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Mazuzan GT 《Science (New York, N.Y.)》1987,236(4804):979-980
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