Spatial and temporal characteristics of trophic structure of the southern Huanghai Sea fish communities

文献类型： 外文期刊

第一作者： Xue Ying

作者： Xue Ying;Jin Xianshi;Xue Ying;Liang Zhenlin;Ye Zhenjiang

作者机构：

关键词： southern Huanghai Sea;trophic guild;food web;dietary overlap;fish assemblage

期刊名称：ACTA OCEANOLOGICA SINICA （ 影响因子：1.431； 五年影响因子：1.445 ）

ISSN： 0253-505X

年卷期： 2008 年 27 卷 4 期

页码：

收录情况： SCI

摘要： The spatial and temporal characteristics of trophic structure of fish communities in the southern Huanghai Sea were examined based on the data sampled from bottom trawl surveys conducted during the autumn of 2000 and the spring of 2001. Hierarchical agglomerative cluster method and bootstrap randomization were used to identify significant trophic groups for each fish assemblage in the southern Huanghai Sea. A total of six major trophic groups were identified within this system, which classified predators based upon location in the water column or prey size (i.e., benthic to pelagic predators or fish to small invertebrate prey predators). The similarity level used to identify significant trophic groups in each assemblage ranged from 24% to 34%. Although planktivores were the dominant trophic group in each assemblage (60%-79%), there were spatial and temporal variations in the trophic structure, which reflected the differences in the abundance and availability of dominant preys. Simplified food webs were constructed to evaluate tire Most important trophic relationships between the dominant prey taxa and the fishes in each assemblage within this system. Although there were some differences in the key prey species among different food webs, pelagic prey items (mainly euphausiids and copcpods) represent the most important energetic link between primary producers and higher trophic level predators. The trophic level for most fishes was between 3 and 4, and the weighted mean trophic level for each assemblage ranged from 3.3 to 3.4. Compared with previous study in the mid-1980s, there was air obvious downward trend in the trophic level for most fish species, which resulted mainly from the fluctuation in key prey species in the Huanghai Sea. The decrease in tire importance of Japanese anchovy seems to be offset by other abundant prey species such as Euphausia pacifica and copepods (mainly Calanus sinicus).

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