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首页> 外文期刊>Estuarine Coastal and Shelf Science >Foraging ecology of an endemic shorebird, the African Black Oystercatcher (Haematopus moquini) on the south-east coast of South Africa
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Foraging ecology of an endemic shorebird, the African Black Oystercatcher (Haematopus moquini) on the south-east coast of South Africa

机译：觅食当地水鸟的生态，在南非东南海岸的非洲黑蛎cat（Haematopus moquini）

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We investigated small-medium (1-300 km) scale variation in the foraging ecology of the African Black Oystercatcher during its breeding season, using traditional diet analysis coupled with carbon and nitrogen stable isotope analysis. Fieldwork was conducted between January and March 2006 and 2007, on rocky shores on the south-east coast of South Africa at East London, Kenton and Port Elizabeth. Middens of shelled prey left by adults feeding their chicks were collected from five territories and the abundances of the collected prey on the foraging areas were estimated using quadrats. Blood samples from 45 birds (16 females, 10 males and 19 chicks) and tissues from the predominant prey species on the territory of each breeding pair were collected for isotope analysis. The Manly-Chesson selectivity index revealed that adults feed their chicks preferentially with the limpet Scutellastra cochlear and the Mediterranean mussel Mytilus galloprovincialis, if available. A slight enrichment in the ~(15)N stable-carbon isotope signature was observed towards the west in both prey and oystercatchers. Differences in isotope signatures between males and females from the same breeding pair indicate sex-related differences in the diet. Both had signatures indicating a mixed diet, but with males exhibiting a signature closer to that of limpets and females closer to that of mussels. In the single case where mussels were rare on the feeding territory, the two members of a pair showed carbon signatures which were identical and very similar to that of limpets. These results indicate dietary partitioning between genders in breeding pairs.
机译：我们使用传统的饮食分析以及碳氮稳定同位素分析，调查了非洲黑蛎cat在繁殖季节觅食生态的中小尺度（1-300 km）变化。在2006年1月至3月至2007年3月之间，在南非东南海岸的多岩石海岸的东伦敦，肯顿和伊丽莎白港进行了实地考察。从五个地区收集成年喂养小鸡的成年猎物留下的带壳猎物的中部，并使用四方动物估计捕食区域中猎物的丰度。收集每对繁殖场领土上的45只鸟（16只雌性，10只雄性和19只小鸡）的血样和主要捕食物种的组织进行同位素分析。曼利·切森（Manly-Chesson）选择性指数显示，成年鸡优先选择羽扇豆Scutellastra和地中海贻贝Mytilus galloprovincialis。在捕食者和牡蛎捕捞者中，向西观察到〜（15）N稳定碳同位素特征的少量富集。同一繁殖对的雄性和雌性之间同位素特征的差异表明饮食中性别相关的差异。两者的特征都表明混合饮食，但雄性的特征更接近帽贝，雌性的特征更接近贻贝。在贻贝在摄食区很少见的单一情况下，一对贻贝中的两个成员显示出的碳签名是相同的，并且非常类似于帽贝。这些结果表明在育种对中性别之间的饮食分配。

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