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首页> 外文期刊>Canadian Journal of Zoology >Alien mammals and the trophic position of the lesser grison (Galictis cuja) in Argentinean Patagonia
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Alien mammals and the trophic position of the lesser grison (Galictis cuja) in Argentinean Patagonia

机译：外来哺乳动物和阿根廷巴塔哥尼亚小gr（Galictis cuja）的营养位置

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摘要

The lesser grison (Galictis cuja), a poorly known mustelid of southern South America, has been described as a catholic feeder living close to water. Consequently, the potential exists for competition with the recently introduced American mink (Mustela vison). Nonetheless, like most ferrets the lesser grison can be a specialized mammal hunter, in which case it could benefit from introduced mammalian prey (the European hare, Lepus europaeus, and European rabbit, Oryctolagus cuniculus). The diet and trophic position of the lesser grison in Argentinean Patagonia are described in order to discuss the potential effects of introduced mammalian species on grison populations. Mammals (mainly native rodents and introduced lagomorphs) occurred in 100% of the feces and represented 95% of the biomass consumed. In one site, European hares and rabbits reached a combined 66% of biomass consumed, whereas in the other site rabbits were scarce or absent and lagomorphs represented 35% of the biomass consumed. We postulate that lesser grison populations in Patagonia have benefited from the introduced lagomorphs. On the other hand, lesser grisons frequently occupied river valleys, but did not rely on aquatic or semiaquatic prey. Hence, hunting-habitat preference segregates this mustelid from the American mink (Mustela vison), which consumes a catholic diet in which aquatic species usually predominate.
机译：小南美gr（Galictis cuja）是南美南部鲜为人知的芥末，已被描述为生活在靠近水的地方的一种食草动物。因此，与最近引进的美国水貂（Mustela vison）竞争的潜力很大。但是，像大多数雪貂一样，较小的gr可能是专门的哺乳动物猎人，在这种情况下，它可能会从引入的哺乳动物猎物（欧洲野兔，欧洲兔和欧洲兔子穴兔）中受益。描述了阿根廷巴塔哥尼亚小gr的饮食和营养位置，以便讨论引入的哺乳动物物种对gr种群的潜在影响。哺乳动物（主要是天然啮齿类动物和引入的鼠类动物）出现在100％的粪便中，占消耗的生物量的95％。在一个地点，欧洲野兔和兔子共消耗了66％的生物质，而在其他地点，兔子稀缺或不存在，而兔形动物代表消耗的35％。我们假设巴塔哥尼亚较少的草ison种群已从引入的兔形体内受益。另一方面，小鹿ison经常占领河谷，但不依赖水生或半水生的猎物。因此，狩猎栖息地的偏爱将这种鼬类与美洲貂（Mustela vison）隔离开来，后者食用通常以水生生物为主的天主教饮食。

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