Foraging behavior and diet composition of Trimma caudomaculata and Trimma caesiura (Gobiidae) on coral reefs in Okinawa, Japan |
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Authors: | Toshifumi Saeki Yoichi Sakai Hiroaki Hashimoto Kenji Gushima |
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Institution: | (1) Department of Bioresources Science and Technology, Graduate School of Biosphere Science, Hiroshima University, 1-4-4 Kagamiyama, Higashi-Hiroshima 739-8528, Japan;(2) Present address: EAC Co. Ltd., 3-34-17 Yafuso, Urasoe, Okinawa 901-2127, Japan |
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Abstract: | The feeding habits of two small gobies, Trimma caudomaculata and T. caesiura, were surveyed on coral reefs in Okinawa, Japan. Both species actively exhibited foraging attempts beneath overhanging reef structures during the daytime, and fed on small animals, mainly copepods. Trimma caudomaculata formed feeding schools in water columns to swallow mainly Calanoida and Harpacticoida. Trimma caesiura stayed by themselves on the reef substratum and captured mainly Harpacticoida by taking short jumps into the water column. Diet compositions of these congeneric gobies may reflect differences in their foraging behaviors and use of microhabitats. |
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Keywords: | Trimma Microhabitat use Foraging behavior Diet composition |
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