Avian predation at a Southern Rockhopper Penguin colony on Staten Island, Argentina
Avian predation at a Southern Rockhopper Penguin colony on Staten Island, Argentina
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阿根廷斯塔滕岛南跳岩企鹅栖息地的鸟类捕食
作者：
Marcela Liljesthröm;S. Emslie;D. Frierson;A. Schiavini
我们研究了捕食风险与巢的位置和亚群的大小在南方跳岩企鹅（Eudyptes chrysocome chrysocome）在小鸡饲养期间。条纹Caracaras（Phalcoboenus australis），主要的捕食者，优先攻击草丛草，发现在所有亚群的外围（外围草丛），往往分散在他们（中央草丛）。最大数量的捕食和企图捕食事件，观察到巢在周边的亚群旁边的周边草丛，并在这些巢旁边的中央草丛。中央草丛为条纹卡拉卡拉提供了一个额外的“边缘”区域，从那里捕食，就像外围草丛一样。每一个人的捕食率是不相关的亚群大小可能是由于存在的中央草丛，通过创建一个额外的边缘区域，改变亚群的形状。有一个建议（P = 0.06）的巢成功的概率增加与亚群大小。
We studied predation risk in relation to nest location and subcolony size in Southern Rockhopper Penguins (Eudyptes chrysocome chrysocome) during the chick-rearing period. Striated Caracaras (Phalcoboenus australis), the main predator, preferentially attacked from tussock grasses which are found in the periphery of all subcolonies (peripheral tussocks) and often scattered within them (central tussocks). The greatest numbers of predation and attempted predation events were observed on nests in the periphery of the subcolony next to peripheral tussocks, and on those nests next to central tussocks. Central tussocks offer Striated Caracaras an additional “edge” area from which to prey, much in the same way as do the peripheral tussocks. Predation rate per individual was not correlated with subcolony size possibly due to the presence of central tussocks which, by creating an extra edge area, change the subcolony shape. There is a suggestion (P = 0.06) of increased probability of nest success with subcolony size.