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首页> 外文期刊>ICES Journal of Marine Science >Sources of variation in the feeding ecology of the piked spur dog (Squalus megalops): implications for inferring predator—prey interactions from overall dietary composition
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Sources of variation in the feeding ecology of the piked spur dog (Squalus megalops): implications for inferring predator—prey interactions from overall dietary composition

机译：尖刺狗（Squalus megalops）的摄食生态系统的变化来源：从总体饮食组成上推断捕食者与猎物之间的相互作用的意义

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Sources of variation in dietary composition were examined in the piked spurdog (Squalus megalops). The species is an opportunistic predator that consumes a wide range of prey items. When importance of prey was measured by weight or occurrence, S. megalops preyed largely on molluscs and teleosts. However, when number of prey was considered, the main items were crustaceans. A bootstrap analysis showed that considerable variability can be expected in the importance of prey items in the species' overall diet. Regional, seasonal, and ontogenetic differences in dietary composition were found, but there were no differences between mature and immature sharks or between males and females. The spatial and temporal variation in diet exhibited by S. megalops and the intrinsic natural variability of the dietary composition of this opportunistic predator suggest that studies that infer predator—prey interactions from overall diet are likely to miss information on the ecological relationships among species and thus account for only part of these interactions.
机译：在尖刺的刺pur（Squalus megalops）中检查饮食组成的变化来源。该物种是一种机会主义的捕食者，会消耗各种各样的猎物。当按重量或发生率来衡量猎物的重要性时，巨型链球菌主要捕食软体动物和硬骨鱼。但是，考虑到猎物的数量，主要物品是甲壳类动物。引导分析表明，预计猎物在该物种总体饮食中的重要性会有很大的差异。发现在饮食组成方面存在区域，季节性和个体发育差异，但成熟和不成熟的鲨鱼之间或雄性和雌性之间没有差异。巨型链球菌所表现出的饮食时空变化和这种机会性捕食者的饮食组成的内在自然变异性表明，从整体饮食中推断出捕食者与猎物相互作用的研究很可能会错过有关物种之间生态关系的信息，因此仅占这些互动的一部分。

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