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首页> 外文期刊>Slovak Raptor Journal >Spatio-temporal trends in the predation of large gulls by peregrine falcons (Falco peregrinus) in an insular breeding population
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Spatio-temporal trends in the predation of large gulls by peregrine falcons (Falco peregrinus) in an insular breeding population

机译：在岛上繁殖种群中，由游f猎鹰（Falco peregrinus）捕食大海鸥的时空趋势

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Individual diet specialization occurs in many populations of generalist predators, with specific individuals developing specialist strategies in their feeding behaviour. Intraspecific resource partitioning is hypothesised to be common amongst species in higher trophic levels where competition for resources is intense, and a key driver in breeding success and community structure. Though well-studied in other predators, there is sparse data on ecological specialization in raptors, which are important drivers of community and trophic structure. In this study, the breeding season diet of an insular population of peregrine falcons (Falco peregrinus) was determined from indirect analysis of prey remains collected over three years. An unexpected result was the high proportion of large gulls (Laridae), of the genus Larus, in the diet of two breeding pairs of peregrines. Large gulls made up 18.44% by frequency of total prey recorded and 30.81% by biomass. Herring gulls (Larus argentatus) were the most common large gull prey, with immatures most frequent (67.95%) compared to adults (19.23%). Overall, most gulls predated were immatures (80.77%). Frequency of predation varied between breeding pairs and months, but was consistent over the three years. Most gulls were taken in April (37.17%), followed by May (19.23%), with a smaller peak of immature herring gulls taken in August and September. The pattern of regular predation by peregrines on large gulls is a new observation with important implications for understanding individual diet specialization in raptors, and its effect on bird populations and community structure.
机译：个体饮食的专门化发生在许多通缉者种群中，特定个体在其饮食行为上发展出专门的策略。在高营养级别的物种中，种内资源分配被认为是常见的，那里营养争夺激烈，是繁殖成功和社区结构的关键驱动力。尽管在其他捕食者中进行了充分的研究，但关于猛禽的生态专业化的数据却很少，这是群落和营养结构的重要驱动力。在这项研究中，根据对三年来收集的猎物残骸的间接分析，确定了一群游of的游eg（Falco peregrinus）的繁殖季节饮食。出乎意料的结果是，在两个繁殖对的游eg的饮食中，鸥属的大海鸥（Laridae）比例很高。大海鸥占总猎物频率的18.44％，占生物量的30.81％。鲱鸥（Larus argentatus）是最常见的大鸥猎物，与成年鸟（19.23％）相比，不成熟幼鸟最为频繁（67.95％）。总体而言，大多数捕食的海鸥都是未成熟的（80.77％）。捕食频率在繁殖对和繁殖月份之间有所不同，但在三年中保持一致。大部分海鸥是在4月（37.17％）拍摄的，其次是5月（19.23％），在8月和9月拍摄的未成熟鲱鸥的峰值较小。游荡者在大海鸥上进行定期捕食的模式是一个新发现，对理解猛禽的个体饮食专长及其对鸟类种群和群落结构的影响具有重要意义。

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