Dual isotope study of food sources of a fish assemblage in the Red River mangrove ecosystem, Vietnam
Dual isotope study of food sources of a fish assemblage in the Red River mangrove ecosystem, Vietnam
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DOI：
10.1007/s10750-013-1737-9
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发表时间：
2014-07-01
期刊：
影响因子：
2.6
通讯作者：
Omori, Koji
中科院分区：
文献类型：
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作者：
Nguyen Tai Tue;Hamaoka, Hideki;Omori, Koji
应用双同位素分析技术研究了越南红河红树林生态系统鱼类的食物源利用和营养关系。23种鱼类的碳、氮稳定同位素特征值分别为-24.0 ~-15.7aEuro度和8.8 ~ 15.5aEuro度。基于Δ C-13和Δ N-15特征的聚类分析清楚地将红树林鱼分为5个摄食组，分别代表肉食性动物、杂食性动物、鱼性动物、底栖动物和食动动物，这与饮食信息一致。结果表明，红树林碳在红树林鱼类食物中所占比例较小，主要食物来源为底栖无脊椎动物，包括蟹类、蟹类、对虾、双壳类、腹足类和多毛类。δ N-15值表明，食物网结构可以划分为不同的营养级（TL）。最低的TL与Liza macrolepis，Mugil cephalus和Periophthalmus modestus相关; 18种鱼类的TL在3.0和3.8之间; Pennahia argentata的TL最高（c. 4.0）。
The food source utilization and trophic relationship of the fish assemblage in the Red River mangrove ecosystem, Vietnam were examined using dual isotope analysis. The carbon and nitrogen stable isotope signatures of 23 fish species ranged from -24.0 to -15.7aEuro degrees and from 8.8 to 15.5aEuro degrees, respectively. Cluster analysis based on the delta C-13 and delta N-15 signatures clearly separated the mangrove fish into five feeding groups, representing detritivores, omnivores, piscivores, zoobenthivores, and zooplanktivores, which concurred with the dietary information. The results suggested that mangrove carbon contributed a small proportion in the diets of the mangrove fish, with dominant food sources coming from benthic invertebrates, including ocypodid and grapsid crabs, penaeid shrimps, bivalves, gastropods, and polychaetes. The delta N-15 values showed that the food web structure may be divided into different trophic levels (TLs). The lowest TLs associated with Liza macrolepis, Mugil cephalus, and Periophthalmus modestus; 18 fish species had TLs between 3.0 and 3.8; and Pennahia argentata had the highest TL (c. 4.0).