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首页> 外文期刊>Estuarine Coastal and Shelf Science >Contribution of different functional groups to the diet of major predatory fishes at a seagrass meadow in northeastern Japan
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Contribution of different functional groups to the diet of major predatory fishes at a seagrass meadow in northeastern Japan

机译：日本东北海草草地上不同功能组对主要捕食鱼类饮食的贡献

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摘要

We examined the variation in habitat use and diet of three dominant fish species (Myoxocephalus brandti, Pholidapus dybowskii, and Pholis crassispina) in a seagrass meadow in the Akkeshi-ko estuary in northeastern Japan, where broad and dense Zostera marina beds exist, using a semi-quantitative census of the fishes and analyses of their stomach contents. Differences among the three fish species in the temporal variation in abundance of each age class (mainly 1- and 2-year age classes) indicated that the temporal pattern of utilization of the seagrass meadow were different among them. In the semi-quantitative dietary analysis, two prey categories, i.e., taxonomic group (order and suborder) and functional group, were used to explain the variation in prey composition with size-dependent changes. The six prey functional groups were classified based on the ecological traits of the prey, i.e., trophic level, size, and life type (habitat and behavior). Ontogenetic shifts in prey of the three fish species could be fully explained by a combination of the two prey categories, and not by the use of only one category (taxonomic or functional group). The pattern of ontogenetic shifts in prey differed among the fish species and size (age) classes. These results indicate that segregation of habitat (seagrass meadow) and prey group (taxonomic and functional group) is performed among the three species, which may contribute to their coexistence in this estuary.
机译：我们在日本东北部Akkeshi-ko河口的海草草甸中调查了三种优势鱼类（Myoxocephalus brandti，Pholidapus dybowskii和Pholis crassispina）的栖息地利用和饮食变化，使用了宽阔而密集的Zostera滨海床。对鱼类进行半定量普查并分析其胃中的含量。三种鱼类在每个年龄段（主要是1岁和2岁年龄段）的丰富度随时间变化的差异表明，它们利用海草草甸的时间模式不同。在半定量饮食分析中，使用两个类别的猎物，即分类组（顺序和子顺序）和功能组，来解释随大小变化的猎物组成变化。根据猎物的生态特征（即营养水平，大小和生活类型（栖息地和行为））对六个猎物功能组进行了分类。可以通过两个猎物类别的组合来充分解释这三种鱼类的个体发生的遗传变化，而不是仅使用一个类别（分类或功能组）。鱼类个体发生变化的方式在鱼类种类和大小（年龄）类别之间是不同的。这些结果表明，在这三个物种之间进行了生境（海草草甸）和猎物组（分类和功能组）的隔离，这可能有助于它们在该河口中共存。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第1期|71-82|共12页
  • 作者

    Katsumasa Yamada; Masakazu Hori; Yoshiyuki Tanaka; Natsuki Hasegawa; Masahiro Nakaoka;

  • 作者单位

    National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan;

    National Research Institute of Fisheries and Environment of Inland Sea, Fisheries Research Agency, 2-17-5 Maruishi, Hatsukaichi, Hiroshima 739-0452, Japan;

    Ocean Research Institute the University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164-8639, Japan International College of Arts and Sciences, Yokohama City University. Seto 22-2, Kanazawa, Yokohama 236-0027, Japan;

    National Research Institute of Aquaculture, Fisheries Research Agency, 422-1 Nakatsuhamaura, Minami-ise, Mie 516-0193, Japan;

    Field Science Center for Northern Biosphere, Hokkaido University, 5 Aikappu, Akkeshi-cho, Akkeshi-gun, Hokkaido 088-1113, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    fish; habitat use; functional group; predator-prey interactions; seagrass; multicategory logit model;

    机译：鱼;栖息地利用;功能小组;捕食者与猎物的相互作用;海草多类别logit模型;

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