Effects of mangrove deforestation on fish assemblage at Pak Phanang Bay,southern Thailand |
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Authors: | Tatsuya Shinnaka Mitsuhiko Sano Kou Ikejima Prasert Tongnunui Masahiro Horinouchi Hisashi Kurokura |
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Institution: | Department of Global Agricultural Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan,;School of Environment, Resources and Development, Asian Institute of Technology, Klong Luang, Pathumthani 12120,;Department of Marine Science, Faculty of Science and Fisheries Technology, Rajamangala University of Technology Srivijaya, Sikao, Trang 92150, Thailand, and;Research Center for Coastal Lagoon Environments, Shimane University, Matsue, Shimane 690-8504, Japan |
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Abstract: | Daytime sampling using a seine net was conducted at Pak Phanang Bay (Nakhon Si Thammarat Province, Thailand) in February and
July 2006, to determine differences in fish assemblage structures between a mangrove site and an adjacent site completely
cleared of mangroves. The overall numbers of fish species and individuals were significantly higher at the mangrove site than
the cleared site in both months. Although benthic crustacean feeders showed more species and individual numbers at the mangrove
site in both months, the opposite was found for zooplankton feeders. A cluster analysis, based on the abundance of each species,
demonstrated that the fish assemblage structures were distinctly different between the two sites. In addition, significant
differences in length frequency distributions for each of the four most abundant species were found between the sites in February
and/or July. Small individuals of Scatophagus argus, Ambassis nalua, and Tetraodon nigroviridis were more common at the mangrove site, and of Chelon subviridis at the cleared site. These results suggest that mangrove deforestation exerts marked effects on fish assemblages. |
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Keywords: | deforestation fish assemblage mangrove Pak Phanang Bay Thailand |
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