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首页> 外文期刊>Oryx >Invasive American Mink Mustela Vison In Wetlands Of The Cape Horn Biosphere Reserve, Southern Chile: What Are They Eating?
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Invasive American Mink Mustela Vison In Wetlands Of The Cape Horn Biosphere Reserve, Southern Chile: What Are They Eating?

机译：智利南部合恩角生物圈保护区湿地中的入侵性美国水貂鼬鼬：它们在吃什么？

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The impact of alien American mink on the native fauna of oceanic islands has been demonstrated in a number of locations. In the sub-Antarctic Cape Horn Biosphere Reserve of southern Chile the species is currently expanding in an area where the native fauna evolved in the absence of terrestrial predators. To evaluate any emerging problems we therefore investigated seasonal variation in prey use by mink on Navarino Island within the Reserve. We identified undigested remains in 414 scats collected from the shores of 27 ponds over January-November 2006. Diet consisted mainly of mammals and birds. Mammals, including both native and exotic rodents, were the predominant prey in all seasons but birds were of equal importance during the summer (when birds breed and their abundance and diversity increases on the island). Exotic rodents were the only identifiable mammalian prey item during winter. Native wetland birds constituted a substantial proportion of mink diet, and greater than that reported in other areas. Many birds breeding on Navarino Island are ground-nesting, a strategy that evolved in the absence of native mammalian predators. Considering the international importance of this region, our results emphasize the need for an assessment of the impact of mink predation on the populations of native prey.
机译：美国外来水貂对海洋岛屿本地动物群的影响已在许多地方得到证实。在智利南部的南极角合恩角生物圈保护区，该物种目前在没有陆地捕食者的情况下在本地动物进化的地区扩展。因此，为了评估任何新出现的问题，我们调查了保护区内纳瓦里诺岛上水貂对猎物使用情况的季节性变化。我们在2006年1月至11月期间从27个池塘的岸边收集了414只粪便中未消化的残骸。饮食主要包括哺乳动物和鸟类。哺乳动物，包括本地和外来啮齿动物，都是所有季节的主要猎物，但鸟类在夏季同等重要（当鸟类在岛上繁殖，其数量和多样性增加时）。外来啮齿动物是冬季唯一可辨认的哺乳动物猎物。本地湿地鸟类在水貂饮食中占很大比例，比其他地区报告的要高。在纳瓦里诺岛上繁殖的许多鸟类都是地面嵌套的，这种策略是在没有本土哺乳动物捕食者的情况下演变而来的。考虑到该地区的国际重要性，我们的结果强调需要评估水貂捕食对当地猎物种群的影响。

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