Food habits of small fishes in seagrass habitats in Trang,southern Thailand |
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Authors: | Masahiro Horinouchi Prasert Tongnunui Keisuke Furumitsu Yohei Nakamura Kouki Kanou Atsuko Yamaguchi Ken Okamoto Mitsuhiko Sano |
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Institution: | (1) Research Center for Coastal Lagoon Environments, Shimane University, 1060 Nishikawatsucho, Matsue Shimane, 6908504, Japan;(2) Department of Marine Science, Rajamangala University of Technology Srivijaya, 179 Moo3 Sikao-Pakmeng Road, Tambon Maifad, Sikao, Trang, 92150, Thailand;(3) Faculty of Fisheries, Nagasaki University, 1-14 Bunkyocho, Nagasaki Nagasaki, 8528521, Japan;(4) Graduate School of Kuroshio Science, Kochi University, 200 Monobe, Nankoku Kochi, 7838502, Japan;(5) Center of Water Environment Studies, Ibaraki University, 1375 Ohu, Itako Ibaraki, 3112402, Japan;(6) Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 1138657, Japan |
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Abstract: | To clarify the feeding habits of seagrass fishes, we examined the gut contents from 42 fish species collected in seagrass
habitats in Trang. Thirteen species showed ontogenetic and/or seasonal changes in food-use patterns. Smaller individuals generally
preyed on small planktonic items (e.g., copepod larvae) or small benthic/epiphytic crustaceans (e.g., harpacticoid copepods),
with subsequent changes to other prey items (e.g., shrimps, crabs, detritus and filamentous algae) with growth. The most important
dietary items for the seagrass fish assemblages comprised benthic/epiphytic crustaceans, detritus, and planktonic copepods.
Cluster analysis based on dietary overlaps showed that the seagrass fishes comprised eight feeding guilds (large benthic/epiphytic
crustacean, detritus, planktonic animal, small benthic/epiphytic crustacean, mollusc, invertebrate egg, polychaete, and fish
feeders). Of these, the first three guilds were the most abundantly represented, whereas the last three were each represented
by only a single species. |
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