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Habitat choice by marine zooplankton in a high-latitude ecosystem

机译:高纬度生态系统中海洋浮游动物的生境选择

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According to habitat choice theory, zooplanktonic prey should choose a depth habitat that maximizes food intake while minimizing predation risk. Body size affects competitive ability and vulnerability in zooplankton, thereby influencing the adaptive choice of depth habitat. To study size-dependent habitat choice in marine zooplankton, we sampled their vertical distributions on a fine-scale with an optical plankton counter (OPC) during a post-bloom condition in late spring on the continental shelf off North Norway. Taxonomic information was obtained from net samples. We found that small and large zooplankton segregated along the water column under resource heterogeneity, with large zooplankton aggregating in the resource-rich habitat together with predators of small zooplankton, in accordance with multi-trophic level habitat choice theory. These patterns of habitat use differ from summer vertical distributions documented in Norwegian waters, when the distribution of small and large zooplankton is reversed. To account for the discrepancy, we propose a new habitat choice model that considers the different predation regimes experienced in spring vs. summer.
机译:根据栖息地选择理论,浮游动物的猎物应选择能使食物摄入量最大化而捕食风险最小的深度栖息地。体型影响浮游动物的竞争能力和脆弱性,从而影响深度生境的适应性选择。为了研究海洋浮游动物大小依赖的栖息地选择,我们在春季后挪威北部大陆架上的花后条件下,使用光学浮游生物计数器(OPC)对它们的垂直分布进行了精细采样。分类信息是从净样品中获得的。我们发现,根据多营养水平生境选择理论,小型和大型浮游动物在资源异质性下沿水柱分离,大型浮游动物与小型浮游动物的捕食者聚集在资源丰富的生境中。这些栖息地的使用方式与挪威水域中记录的夏季垂直分布不同,小型和大型浮游动物的分布相反。为了解决这一差异,我们提出了一种新的栖息地选择模型,该模型考虑了春季和夏季经历的不同捕食方式。

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