월성 원자력발전소 주변해역에 서식하는 대형저서동물의 군집구조
Community Structure of Macrobenthic Assemblages around the Wolseong Nuclear Power Plant, East Sea of Korea
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Abstract
This study was carried out to investigated community structure of macrobenthic assemblages around the Wolseong Nuclear Power Plant, East Sea of Korea and seasonal sampling was performed from October 2007 to July 2008. A total of 163 macrobenthic fauna were collected. The overall average macrobenthos density and biomass were 1,005 individuals m-2 and 21.81 gWWt m-2, respectively. Based on the LeBris (1988) index, there were 10 dominant species accounting for approximately 69.00% of total individuals. The major dominant species were the polychaetes Spiophanes bombyx (349 inds. m-2), Mediomastus californiensis (82 inds. m-2), Sigambra tentaculata (55 inds. m-2), Magelona japonica (50 inds. m-2), Scoletoma longifolia (33 inds. m-2) and the Unidentified amphipod (Amphipoda spp., 72 inds. m-2). The conventional multi-variate statistics (cluster analysis and non-metric multi-dimensional scaling) applied to assess spatial variation in macrobenthic assemblages. Cluster analysis and nMDS ordination analysis based on the Bray-Curtis similarity identified 2 major station groups. The major group 1 was associated with sand dominated stations and was characterized by high abundance of the bivalves Mactra chinensis, Siliqua pulchella and the polychaete Protodorvillea egena. On the other hand, major group 2 was connected with mud dominated stations and was numerically dominated by the polychaetes M. californiensis, M. japonica, Sternaspis scutata, S. longifolia and the bivalves Thyasira tokunagai and Theora fragilis. However, macrobenthic community structure were no significant differences between the environmental variables (sediment type and depth) and heated discharge.
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