Preliminary report on the diversity and community structure of macroalgae before and after the 2004 Tsunami at Talibong Island, Trang Province, Thailand

概要

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The diversity and community of macroalgae were investigated at 3 sites at Talibong Island, Trang Province, Thailand, from April 2004 to May 2005. Preliminary studies revealed a high diversity of macroalgae on the west coast of the island. Therefore, it was decided that these were good sites to set up fifteen of 0.5m×0.5m permanent plots to monitor macroalgae community changes. Physical factors such as salinity, seawater temperature, NO3-, NO2- and Po4^<2-> were also measured. Eighteen species of macroalgae were found. Sargassum stolonifolium and Laurencia composita were the most abundant species, covering 90% and 39%, respectively, on the rocky substrate. Padina sanctae-crucis and Caulerpa taxifolia were the most dominant species on the sandy substrate. Thirteen species varied among the sites and seasons. Eleven species were strongly influenced by the 26 December, 2004 tsunami. L. composita and Padina sanctae-crucis, for example, were washed up to the shores by the strong tsunami wave, and clearly resulted in a decrease in percentage cover. In addition, many permanent plots were covered by sediment causing anoxic conditions. Multivariate analysis revealed that most macroalgae and sites were randomly spread out on the axis before the tsunami; but they were grouped after the tsunami hit these sites. We have not found any seasonal pattern or recovery of macroalgae after 5 months after the tsunami.
東京大学の論文
2006-04-28