Intra- and interspecific variability in prey size and niche breadth of myctophiform fish larvae
Intra- and interspecific variability in prey size and niche breadth of myctophiform fish larvae
复制标题
菌形鱼幼虫猎物大小和生态位宽度的种内和种间变异
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
E. Saiz
中科院分区：
文献类型：
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作者：
A. Sabatés;E. Saiz
猎物大小是影响仔鱼捕食选择的主要因素之一，与仔鱼的觅食能力和口的大小密切相关。本研究探讨了6个共存的鱼苗种Myctophiformes在地中海西部的食性。矛形目是世界范围内公海的优势硬骨鱼类，其幼体具有高度的形态变异性。在本研究中，通过对所有物种的幼虫发育，摄入的猎物的大小增加，但在不同的速度。生态位宽度（即摄入猎物的大小范围，估计为对数转换猎物大小的标准差）在整个生长过程中是恒定的。幼虫主动选择某些猎物的大小;选择在发育过程中发生变化，并且在物种之间存在差异。这种变化似乎与种间形态差异，并可能构成一种策略，以优化利用营养资源的贫营养公海栖息地。
Prey size is one of the major factors involved in prey selection of fish larvae, and is closely related to their foraging abilities and mouth size. This study examines the feeding habits of 6 coexisting fish larvae species of the order Myctophiformes in the western Mediterranean. The Myctophiformes are the dominant teleosts of the open oceans worldwide, and their larvae are char- acterized by high morphological variability. In the present study, size of ingested prey increased through larval development for all species examined, but at different rates. Niche breadth (i.e. range of sizes of ingested prey, estimated as the standard deviation of log-transformed prey sizes) was con- stant throughout growth. The larvae actively selected certain prey sizes; selection changed during development, and varied between species. This variability appears to be related to interspecific morphological differences, and may constitute a strategy to optimize the utilization of trophic resources in the oligotrophic open-ocean habitat.