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首页> 外文期刊>Ostrich >Varied diet and opportunistic foraging in the Ethiopian Bush-crow Zavattariornis stresemanni, an Endangered generalist
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Varied diet and opportunistic foraging in the Ethiopian Bush-crow Zavattariornis stresemanni, an Endangered generalist

机译：在埃塞俄比亚布什 - 乌鸦扎维尔诺恩斯·斯特雷西姆anni等各种各样的饮食和机会觅食，一个濒危的通会

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摘要

The Ethiopian Bush-crow Zavattariornis stresemanni is an endangered, co-operatively breeding southern Ethiopian endemic with a remarkably restricted range (c. 6 000 km(2)). The species' range was recently found to be almost perfectly predicted by an envelope of cooler, drier and more seasonal climate than surrounding areas, but the proximate determinants of this range restriction remain unclear. We assessed whether specialisation in diet or foraging may restrict the range of the species by conducting foraging watches to determine prey composition, augmented by observations of opportunistic foraging techniques, and by comparing our results to previously published information on diet. Prey composition comprised a range of arthropods, such as insect larvae (62.7%), beetles (Coleoptera) (15.6%), and grasshoppers and crickets (Orthoptera) (11.8%). Prey was primarily obtained by pecks above ground (74.2%) but also frequently dug up (23.8%). Prey capture was most successful during pecks and we also found chicks were preferentially fed larger prey items over smaller ones by adults. We documented opportunistic behaviours such as nest-raiding and ox-pecking. Diet and foraging are varied and unspecialised, and therefore do not appear to explain the restricted range of the Ethiopian Bush-crow.
机译：埃塞俄比亚·布什 - 乌鸦扎维尔诺恩斯特雷西姆anni是一个濒临灭绝的，共同可操作地繁殖的埃塞俄比亚人，具有显着限制范围（C.6 000公里（2））。最近发现物种的范围几乎完全由凉爽，干燥器和更季节性气候的信封预测，而不是周边地区，但该范围限制的近似决定因素仍然尚不清楚。我们评估了饮食或觅食的专业化是否可以通过进行觅食手表来限制物种的范围，以确定猎物组合，通过观察机会觅食技术来增强，并通过将我们的结果与先前公布的饮食信息进行比较。施法组合物包含一系列节肢动物，例如昆虫幼虫（62.7％），甲虫（鞘翅目）（15.6％）和蚱蜢和蟋蟀（正交）（11.8％）。猎物主要由地面啄物（74.2％）而且经常挖出（23.8％）。猎物捕获在啄食期间最成功，我们也发现小鸡优先通过成年人对较小的猎物。我们记录了巢穴袭击和牛皮等机会主义行为。饮食和觅食是多种多样的，没有明确的，因此似乎并不是解释埃塞俄比亚布什乌鸦的限制范围。

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