한려해상국립공원 관음포 갯벌의 대형저서동물 군집 구조

This study was performed to investigate the community structure of the macrobenthic invertebrates on the Gwaneumpo tidal flat, Hallyeohaesang National Park, Korea. Benthic invertebrates were collected between April and September 2006 at each five station. A total of 67 macrobenthic species were collected. The overall average macrobenthos density and biomass were 1,429 individuals/m² and 154.40 gWWt/m², respectively. Based on the abundance and biomass data, there were 10 dominant species accounting for approximately 86.4% of total individuals. The highest densities were found in the polychaetes Heteromastus filiformis, Ceratonereis erythraeensis, the brachyura Ilyoplax pusilla and the amphipoda Corophidae unid. On the contrary, the top ten species made up 94.2% of the total biomass while the three most abundant, the bivalve Cyclina sinensis, the brachyura Macrophthalmus japonicus and the anomura Upogebia major. 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 station groups. The group 1 was associated with upper tidal flat station(station 1) and was characterized by high abundance of the polychaetes C. erythraeensis, Cirriformia tentaculata, the brachyura I. pusilla, the amphipoda Corophidae unid. and the isopoda Paranthura japonica. However, group 2 was consisted with middle and lower tidal flat station(Station 2～5) and was numerically dominated by the polychaetes Capitella capitata, Glycera chirori, the brachyura M. japonicus, the amphipoda Pleustes sp. and the anomura U. major.