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Determination of Trophic Transfer at a Created Intertidal Oyster (Crassostrea ariakensis) Reef in the Yangtze River Estuary Using Stable Isotope Analyses

文献类型： 外文期刊

作者： Quan, Wei-min 1 ; Humphries, Austin T. 2 ; Shi, Li-yan 1 ; Chen, Ya-qu 1 ;

作者机构： 1.Chinese Acad Fishery Sci, E China Sea Fisheries Res Inst, Minist Agr, Key & Open Lab Marine & Estuarine Fishery Resourc, Shanghai 200090, Peoples R China

2.Louisiana State Univ AgCtr, Sch Renewable Nat Resources, Baton Rouge, LA 70803 USA

关键词： δ~(13)C;δ ~(15)N;Crassostrea ariakensis;Essential fish habitat;Food web;Habitat structure;Nekton;Oyster reef

期刊名称：ESTUARIES AND COASTS （ 影响因子：2.976； 五年影响因子：3.186 ）

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收录情况： SCI

摘要： Oysters can create reefs that provide habitat for associated species resulting in elevated resident abundances, lower mortality rates, and increased growth and survivorship compared to other estuarine habitats. However, there is a need to quantify trophic relationships and transfer at created oyster reefs to provide a better understanding of their potential in creating suitable nekton habitat. Stable isotope analyses (δ ~(13)C and δ ~(15)N) were conducted to examine the organic matter sources and potential energy flow pathways at a created intertidal oyster (Crassostrea ariakensis; hereinafter, oyster) reef and adjacent salt marsh in the Yangtze River estuary, China. The δ ~(13)C values of most reef-associated species (22 of 37) were intermediate between those of suspended particle organic matter (POM) and benthic microalgae (BMI), indicating that both POM and BMI are the major organic matter sources at the created oyster reef. The sessile and motile macrofauna colonizing the reef make up the main prey of transient nekton (e. g., spotted sea bass, Asian paddle crab, and green mud crab), thus suggesting that the associated community was most important in supporting higher trophic levels as opposed to the direct dietary subsidy of oysters. The created oyster reef consistently supported higher trophic levels than the adjacent salt marsh habitat due to the dominance of secondary consumers. These results indicate that through the provision of habitat for associated species, created oyster reefs provide suitable habitat and support a higher average trophic level than adjacent salt marsh in the Yangtze River estuary.

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