아산만 연성저질에 서식하는 저서동물의 군집분석

Abstract

Investigations were performed on macrobenthic community of Asan Bay, mid-western coast of Korea, Yellow Sea, from April 2000 to January 2001. Macrobenthic fauna consisted of 46 species with 1,846 individuals. The number of species and occurring frequency of the major groups were as follows: polychaete species (45.7%), molluscs species (23.9%), crustacean species (13.0%), echinoderm species (6.5%) and other group species (10.9%). The mean density was 46.2inds./m2. The dominant species were Prionospio sp. (Polychaetes), Ruditapes philippinarum (Bivalvia), Tharyx sp. (Polychaetes), Lumbrineris longifolica (Polychaetes), L. cruzensis (Polychaetes). The inner bay and coastal area of the bay were characterized by the occurence in the areas of high organic pollution and opportunistic species. Based on the topography of the bay and sediment types, the study area is easily divided into two zones; inner bay and outward bay area. It was evident from these results that species number and diversity have decreased, while dominance and pollution indicator species have increased. From this study, it may be concluded that a variation in the macrobenthic community of the study area was triggered by environmental changes.