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Responses of fish assemblage structures to sandy beach types in Kyushu Island, southern Japan

机译：日本南部九州岛鱼群结构对沙滩类型的响应

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摘要

To determine differences in fish assemblage structures between beach morphodynamic types on an exposed sandy shore, three beach types (reflective, intermediate, and dissipative) were sampled at Fukiagehama Beach, Kyushu Island, southern Japan, in May, August, and November 2006 and 2007. Distinct differences in physical conditions and the amount of major prey invertebrates, such as copepods, mysids, and amphipods, were recognized between the three beach types. The reflective beach was characterized mainly by turbulent swashes, coarse sediment, and a low abundance of major prey invertebrates. In contrast, the dissipative beach was characterized mostly by benign swashes, fine sediment, and a high abundance of prey invertebrates. The intermediate beach tended toward an intermediate condition between the reflective and dissipative beaches. The fish assemblage structures also differed clearly between the three beach types, with species and individual numbers being greatest on the dissipative beach and lowest on the reflective beach. A similarity index indicated differences in species composition of the assemblages between the beach types. Such differences arose primarily from the differential distributions of two dominant trophic groups, zooplankton (mostly copepods) and epibenthic crustacean (mainly mysids and amphipods) feeders, between the beach types, both groups tending to increase in species and individual numbers from the reflective beach to the dissipative beach. In addition, the mean standard length of all fish collected in each month tended to decrease toward the dissipative beach. These results suggested that beach types strongly influence sandy beach fish assemblage structures.
机译：为了确定裸露的沙滩上海滩形态动力学类型之间鱼群结构的差异，分别于2006年5月，8月和11月在日本南部九州岛福吉滨滨海滩采样了三种海滩类型（反射型，中间型和耗散型）。 。在三种海滩类型之间，人们认识到身体条件和主要猎物无脊椎动物（如co足类，my类和双足类）的数量存在明显差异。反光海滩的主要特征是湍流冲刷，沉积物较粗和主要猎物无脊椎动物数量少。相比之下，耗散性海滩的主要特征是良性冲积，细小的沉积物和大量的无脊椎动物。中间泳滩趋向于反射泳滩和耗散泳滩之间的中间状态。在三种类型的海滩之间，鱼的聚集结构也明显不同，在耗散性海滩上，种类和个体数量最大，而在反射性海滩上，种类和个体数量最少。相似性指数表明海滩类型之间组合的物种组成存在差异。这种差异主要是由于海滩类型之间的两个主要营养族，浮游动物（主要是co足类）和表皮甲壳类动物（主要是s类和两栖类）的不同分布引起的，从反射海滩到耗散的海滩。此外，每个月向耗散海滩收集的所有鱼类的平均标准长度趋于减少。这些结果表明，海滩类型强烈影响着沙滩鱼的组装结构。

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  • 来源
    《Marine biology》 |2013年第7期|1563-1581|共19页
  • 作者

    Yukinori Nakane; Yusuke Suda; Mitsuhiko Sano;

  • 作者单位

    Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences. The University of Tokyo,Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;

    Department of Applied Aquabiology, National Fisheries University, Nagata-honmachi, Shimonoseki, Yamaguchi 759-6595, Japan;

    Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences. The University of Tokyo,Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;

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