한국 온산만에서의 해산 무척추동물의 생태학적 연구 = An Ecological Study on the Marine Invertebrates in Onsan Bay , Korea

다국어 초록 (Multilingual Abstract)

For the biosystematic studies on the marine fouling invertebrates in Korea, a faunal and ecological study on macrozoobenthos was carried out at Onsan Bay, where have been affected by the industrial progress due to the economic development. The materials were collected from Onsan Bay and unpolluted area by qualitative and quantitative sampling methods. Macrobenthic animals collected during the study were identified 243 species in total which were consisting of 11 spp. in Hydrozoa. 10 spp. in Anthozoa among Cnidaria, 16 spp. in Polyplacophora. 126 spp. in Gastropoda, 42 spp. in Bivalvia among Mollusca. and 38 spp. in Ascidiacea. And they were 42 spp. from Onsan and 88 spp. from Ulgi in summer season and 106 spp. from Ch`undo and 107 spp. from Tangsa in winter season. The species composition seems to be related to seasonal variation and polluted conditions. Macrobenthic communities indicated that the number of species were more and more depending on unpolluted conditions, and the abundance and the biomass were more and more depending on polluted conditions. The dominant species investigated in these sites according to the importance value (Ⅳ) were as follows: Obelia geniculata, Mytilus edulis, Ostrea circumpicta at Onsan: Botrylloides violaceus, Mytilus edulis, Crassostrea gigas at Ch`undo: Melithaea flabellifera at Ulgi: Symplectoscyphus hozowai at Tangsa. And their vertical distribution and the substrata of each sites were investigated and observed altogether. In order to understand the structure of macrobenthic community, such as ecological indices like species diversity(H), eveness(e) and dominance(C) were measured: H: 1.40-2.21: e: 0.21-0.36: C: 0.44-0.53.