Differences in fish assemblage structures between fragmented and continuous seagrass beds in Trang,southern Thailand |
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Authors: | Masahiro Horinouchi Prasert Tongnunui Kusuto Nanjyo Yohei Nakamura Mitsuhiko Sano Hisao Ogawa |
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Institution: | (1) Research Center for Coastal Lagoon Environments, Shimane University, Matsue Shimane, 6908504, Japan;(2) Department of Marine Science, Rajamangala University of Technology Srivijaya, Sikao, Trang, 92150, Thailand;(3) Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku Tokyo, 1138657, Japan;(4) Graduate School of Kuroshio Science, Kochi University, Nankoku Kochi, 7838502, Japan;(5) Department of Marine Biosciences, School of Marine Biosciences, Kitasato University, Ohfunato Iwate, 0220101, Japan;(6) Present address: Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku Tokyo, 1138657, Japan |
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Abstract: | Fish assemblage structures in fragmented and continuous seagrass habitats in Trang Province, Thailand, were examined in detail
to elucidate the effects of habitat fragmentation. The assemblage structures clearly differed: fish species diversity was
apparently higher in the fragmented seagrass beds, although total fish numbers did not differ between them. A total of 37
fish species were collected, including 24 and 34 species from the continuous and fragmented beds, respectively. Thirteen species
were restricted to the fragmented beds, compared with three restricted to the continuous beds. In addition, eight species
were more abundant in the fragmented beds and only two in the continuous beds. Such differences may have arisen, at least
in part, from differences in microhabitat diversity and the relative amounts of microhabitats between the two habitat types,
as well as specific microhabitat preferences of the resident fishes. Although fragmented beds supported greater fish species
diversity at the present study sites, it is axiomatic that habitat fragmentation caused by anthropogenic disturbance is unacceptable,
with seagrass-habitat conservation being essential for both the preservation of high overall biodiversity and the successful
management of local fisheries. |
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