Dual isotope study of food sources of a fish assemblage in the Red River mangrove ecosystem, 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 -15.7‰ and from 8.8 to 15.5‰, respectively. Cluster analysis based on the δ13C and δ15N 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 δ15N 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).

Title: Dual isotope study of food sources of a fish assemblage in the Red River mangrove ecosystem, Vietnam
Authors: Tue, Nguyen Tai
Hamaoka, Hideki
Tran Dang;, Quy
Mai Trong, Nhuan
Sogabe, Atsushi;
Nam, Nguyen Thanh;
Omori, Koji
Keywords: Fish
Food sources;
Mangrove ecosystem
Stable isotopes
Trophic level
Vietnam
Issue Date: 2014
Publisher: Hydrobiologia
Citation: Scopus
Abstract: 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 -15.7‰ and from 8.8 to 15.5‰, respectively. Cluster analysis based on the δ13C and δ15N 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 δ15N 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).
Description: Hydrobiologia, Volume 733, Issue 1, July 2014, Pages 71-83
Hydrobiologia
URI: http://link.springer.com/article/10.1007%2Fs10750-013-1737-9
http://repository.vnu.edu.vn/handle/VNU_123/33945
ISSN: 00188158
Appears in Collections:Bài báo của ĐHQGHN trong Scopus

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