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Diel feeding pattern of whiting in the North Sea

机译：在北海白垩纪的白el取食方式

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Though numerous studies have analysed the feeding periodicity of North Sea gadoids, no general diel pattern has been found. The lack of agreement between studies may be related to differences in prey composition and behaviour, but it has not been attempted to link the diel intake pattern directly to intake of individual prey. This study presents an analysis of the round the clock occurrence of several prey types in the stomachs of whiting Merlangius merlangus, a major predator on fish and crustaceans in the North Sea. Generalised linear models were used to determine if the occurrence of different prey varied significantly with time of day and whether this diel pattern differed between locations and predator size groups. The results show that the occurrence of bottom dwelling prey increased significantly during the night at 4 of 5 locations. In contrast, free swimming prey and prey migrating towards the demersal layer during the day were eaten mainly in the daylight hours. No diel pattern in the presence of larger fish prey could be found, presumably due to their longer digestion time. A general diel pattern in catch rates of the predator could not be detected and the analyses did not appear to be biased by vertical migration of the predator. The results have important implications for the understanding of prey selection by wild predators, as this is, in effect, a choice between temporally co-occurring prey.
机译：尽管许多研究已经分析了北海灵长类动物的摄食周期，但没有发现一般的迪尔模式。研究之间缺乏一致性可能与猎物组成和行为上的差异有关，但尚未尝试将迪尔的摄入方式直接与单个猎物的摄入联系起来。这项研究提供了对白鲑（Merlangius merlangus）（一种主要捕食北海鱼类和甲壳类动物的捕食者）的胃中全天候出现的猎物的分析。使用广义线性模型来确定不同猎物的发生是否随一天的时间而显着变化，以及不同位置和捕食者大小组之间这种diel模式是否不同。结果表明，在5个位置中的4个位置，夜间栖息地底栖猎物的发生显着增加。相比之下，白天自由游泳的猎物和迁移到海底层的猎物主要在白天被吃掉。由于存在较长的消化时间，因此在较大的鱼类被捕食时没有发现迪尔模式。在捕食者的捕获率中无法检测到一般的迪尔模式，并且分析似乎没有因捕食者的垂直迁移而产生偏差。这些结果对于理解野生捕食者对猎物的选择具有重要意义，因为这实际上是在时间上同时出现的猎物之间进行的选择。

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