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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Pleistocene to recent dietary shifts in California condors.
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Pleistocene to recent dietary shifts in California condors.

机译:更新世到最近加州秃鹰的饮食变化。

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摘要

We used carbon and nitrogen isotopes to investigate changes in the diet of California condors from the Pleistocene to the recent. During the Pleistocene, condors from California fed on both terrestrial megafauna and marine mammals. Early accounts reported condors feeding on the carcasses of marine mammals, but by the late 1700s, condor diets had shifted predominantly to terrestrial animals, following the commercial harvesting of marine mammals and the development of cattle ranching on land. At present, dairy calves provided by humans significantly augment condor diet, constituting an artificial support of the current population. Reestablishing a marine mammal component in the condor diet may be an effective strategy for fostering viable condor populations independent of direct human subsidies.
机译:我们使用碳和氮同位素研究了从更新世到最近的加州秃鹰饮食的变化。在更新世期间,来自加利福尼亚的秃鹰以陆生大型动物和海洋哺乳动物为食。早期的报道称,秃鹰以海洋哺乳动物的尸体为食,但到1700年代后期,随着海洋哺乳动物的商业化捕捞和陆上牧场的发展,秃鹰的饮食主要转向陆生动物。目前,人类提供的奶牛犊大大增加了秃鹰的饮食,构成了当前人口的人工支持。在秃鹰饮食中重新建立海洋哺乳动物成分可能是培养独立于人类直接补贴的可行秃鹰种群的有效策略。

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