Food habits of fishes in the mangrove estuary of Urauchi River,Iriomote Island,southern Japan |
| |
| Authors: | Kusuto Nanjo Hiroyoshi Kohno Mitsuhiko Sano |
| |
| Institution: | (1) Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 113-8657 Bunkyo, Tokyo, Japan;(2) Okinawa Regional Research Center, Tokai University, 907-1541 Taketomi, Okinawa, Japan |
| |
| Abstract: | The food habits of 67 fish species collected from the mangrove estuary of the Urauchi River, Iriomote Island, southern Japan
were investigated using gut content analysis. Ontogenetic changes in food preference were recognized in nine species, including
mugilids, gerreids, mullids, gobiids and tetraodontids. In most cases, juveniles of these species fed mostly on small crustaceans
(e.g. calanoid and cyclopoid copepods and gammaridean amphipods) or detritus. With their subsequent growth, larger prey items
(e.g. crabs and polychaetes) became dominant. A cluster analysis based on dietary overlaps showed that the mangrove fish assemblage
comprised eight trophic groups (zooplankton, small benthic crustacean, large benthic crustacean, polychaete, fish, detritus,
plant and insect feeders). Of these, large and small benthic crustacean feeders, which consumed mainly crabs and gammaridean
amphipods, respectively, were the most abundantly represented in terms of species, whereas polychaete and insect feeders were
each represented by only two species. |
| |
| Keywords: | diet fish assemblage mangrove estuary trophic group |
| 本文献已被 SpringerLink 等数据库收录！ |
|
