Meiobenthos in Nha trang bay of the south China sea (Vietnam) |
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| Authors: | Olga N Pavlyuk Julia A Trebukhova |
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| Institution: | (1) Russian Academy of Sciences, A.V. Zhirmunsky Institute of Marine Biology, Far East Branch, 690041 Vladivostok, Russia |
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| Abstract: | The distribution of the taxonomical composition and the density of meiobenthos depending on the sediment type has been studied
in bottom sediments of Nha Trang Bay. The maximal population density and the taxonomical diversity were observed in the silted
coarse and heterogeneous sand (1031.4μ419.7 ind. 10 cm-2), whereas the minimal level of density and diversity (588.1μ152.5 ind. 10 cm-2) was in the coarse and heterogeneous sand with shell debris and corals. The correlation between the median diameter of sediment
particles and population density of meiobenthos has been revealed (r=0.82, p<0.05). In bottom sediments of Nha Trang Bay,
twenty six taxonomic groups of meiobenthos were observed. Nematodes dominated in all sediment types. Representatives of four
orders, twenty eight families and ninety seven genera of marine nematodes were identified. The vertical distribution of meiobenthos
in different sediment types was considered. A sediment column (10 cm height) was sectioned by five 2 cm portions. In the last
layer (8-10 cm) the most number of meiobenthic groups was found in sandy sediments. In the lower layers of silt sediments,
only nematodes were found. |
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| Keywords: | Density of meiobenthos sediment type nematodes horizontal vertical distribution |
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