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Variation of mollusca on rocky intertidal zone in the mid-western coast of Korea

Gil-Hae Noh, Jong-Duk Choi, Mi-Hee Lee, Su-Jeong Shin and Dong-Ki Ryu

Department of Aquaculture and Aquatic Science, Kunsan National University, Gunsan 54150, Korea Fisheries Research and Environment Division, National Institute of Fisheries Science, Yeosu 59780, Korea

The purpose of this study is to investigate distribution pattern and variation of mollusca species in the rocky intertidal zone of the mid-western coast of Korea from July 2016 to May 2017. Five stations determined at Seocheon, Gunsan and Buan in the mid-western coast were divided into high, middle, and low sections, and sampling was conducted using a quadrate of 50 cm × 50 cm (0.25 m2). Each station was photographed with a camera and quantitative investigation was conducted based on the photographic data. A number of 16 mollusca species occurred during the investigation period. The mean density was 530 ind./m2 and the mean biomass was 141.42 gWWt/m2. The major density dominant species were a Reishia clavigera, Cellana toreuma, Nerita japonica, Littorina brevicula. Cluster analysis results by density data indicated 3 groups. The A group consisted of the St. 2, the B group consisted of the St. 1 and St. 3, and C group consisted of St. 4 and St. 5. Among the species that contributed to the similarity of each group, A group was Littorina brevicula and Crassostrea gigas, B group was Littorina brevicula and Reishia clavigera, C group was Reishia clavigera and Cellana toreuma.

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