Dual isotope study of food sources of a fish assemblage in the Red River mangrove ecosystem, Vietnam

作者：Nguyen Tai Tue^*; Hamaoka Hideki; Tran Dang Quy; Mai Trong Nhuan; Sogabe Atsushi; Nguyen Thanh Nam; Omori Koji

来源：Hydrobiologia, 2014, 733(1): 71-83.

DOI：10.1007/s10750-013-1737-9

• Mangrove ecosystem
• Stable isotopes
• Fish
• Food sources
• Trophic level
• Vietnam

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).

• 出版日期2014-7