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首页> 外文期刊>Biology Bulletin >The Lesser Snow Goose on Wrangel Island: Trophic Interactions with Ruminants and Breeding Habitat Selection
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The Lesser Snow Goose on Wrangel Island: Trophic Interactions with Ruminants and Breeding Habitat Selection

机译：弗兰格尔岛上的小雪雁：反刍动物与繁殖栖息地的营养相互作用

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摘要

The lesser snow goose (Anser caerulescens caerulescens) has been exterminated across a vast area of Eurasia. At present, it is unable to regenerate there, though its population in North America has reached fifteen million. In Eurasia, the only major nesting colony still persists on Wrangel Island, where the geese use the trophic resources together with ruminants. An assessment of the competitive networks and the trophic interactions between the geese and the ruminants was performed. The analysis of the significance of the trophic niche overlap and the competitive advantages of geese in the habitat preferences has proved that the ruminants are stronger competitors for trophic resources than the geese. It has been ascertained that the levels of competition for trophic resources and/or resource shortages are higher across the habitats of most types associated with the goose colony. The level of the competition for trophic resources is lower, and the feed resources are more diverse and abundant in the habitats that are used by the geese after leaving the colony. It can be concluded that the shortage of resources and/or the stronger competitors for trophic resources (the ruminants) cannot prevent restoration of extinct colonies or the formation of new colonies with a recent increase in the size of the goose population on Wrangel Island. The distribution, abundance, and quality of trophic resources and the competition for them with ruminants do not determine the goose choice of a habitat for a nesting colony. The choice depends on the microclimate and, probably, on a range of other factors.
机译：较小的雪雁（Anser caerulescens caerulescens）已在整个欧亚大陆被灭绝。尽管它在北美的人口已达到一千五百万，但目前无法在那里再生。在欧亚大陆，唯一的主要筑巢殖民地仍然保留在弗兰格尔岛上，那里的鹅利用反刍动物的营养资源。对鹅和反刍动物之间的竞争网络和营养相互作用进行了评估。对营养小生境重叠的重要性和鹅在生境偏好方面的竞争优势的分析证​​明，反刍动物在营养资源方面比鹅更强。已经确定，在与鹅群有关的大多数类型的生境中，营养资源和/或资源短缺的竞争水平较高。鹅在离开殖民地后所使用的栖息地中，对营养资源的竞争水平较低，饲料资源更加多样化和丰富。可以得出结论，资源的短缺和/或营养资源的更强竞争者（反刍动物）无法阻止灭绝的殖民地的恢复或新殖民地的形成，而最近弗兰格尔岛上的鹅种群数量有所增加。营养资源的分布，丰度和质量，以及反刍动物对它们的竞争，并不能决定嵌套营地栖息地的鹅选择。选择取决于小气候，可能还取决于其他一系列因素。

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