오륙도 주변해역 십각류의 계절별 수심별 종조성과 군집구조

Abstract

The seasonal variations by depths of decapods near Oryuk Islets off Busan were investigated at seven stations from April 2009 to January 2011. Decapods was collected by SCUBA diving at 5 m to 10 m depths. 46 species belonging to 18 families of 3 orders were identified. Pilumnus minutus, Pugettia intermedia, Pachycheles stevensii, and Paguristes japonicus were dominant species and comprised 73.03% of total decapods. In all season P. minutus and P. intermedia (except summer) were abundant, on the other hand P. stevensii, P. japonicus were abundant in fall and summer, respectively. The dominant species can be divided into three groups (resident species, seasonal species and temporary species) on the basis of their occurrence patterns. P. minutus and P. intermedia were resident species and P. stevensii, P. japonicus were temporary species. The number of species, density and biomass fluctuated with the seasons. They were highest in fall and lowest in winter. Seasonal variation in the number of species and density in decapods corresponded with the temperature.