서해 태안반도 연안에서 오터트롤에 채집된 저서생물의 종조성 및 계절변동
Comparison of Species Composition and Seasonal Variation of Demersal Organisms Caught by Otter Trawl in the Coastal Waters off the Taean Peninsula, in the West Sea of Korea
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초록
To investigate species composition and seasonal variation of demersal organisms in the coastal waters off the Taean peninsula, otter trawl surveys were conducted from April 2010 to January 2011. A total of 75 species were collected, including 44 species of Pisces, 19 species of Crustacea, 6 species of Cephalopoda, 4 species of Gastropoda, and 1 spe- cies each of Bivalvia and Echinoidea. The dominant species in each season were Palaemon gravieri in spring, Cha - rybdis bimaculata in summer, Loligo japonica in autumn, and Crangon hakodatei in winter. The number of species, individuals and biomass were highest in autumn and lowest in winter. The diversity index was highest in summer and lowest in winter. The dominance index was highest in winter and lowest in summer. The richness index was highest in autumn and lowest in winter. The evenness index was highest in summer and lowest in autumn. A cluster analysis showed that demersal organisms were divided into two groups; spring and winter organisms (Group 1) and summer and autumn organisms (Group 2). We detected a significant difference ( P <0.05) between these groups, mainly owing to Platycephalus indicus , Repomucenus koreanus , and Paralichthys olivaceus within Pisces: Trachysalambria curvi - rostris, Metapenaeopsis dalei , P . gravieri , and C . hakodatei within Crustacea: and L . japonica within Cephalopoda.
Abstract
To investigate species composition and seasonal variation of demersal organisms in the coastal waters off the Taean peninsula, otter trawl surveys were conducted from April 2010 to January 2011. A total of 75 species were collected, including 44 species of Pisces, 19 species of Crustacea, 6 species of Cephalopoda, 4 species of Gastropoda, and 1 spe- cies each of Bivalvia and Echinoidea. The dominant species in each season were Palaemon gravieri in spring, Cha - rybdis bimaculata in summer, Loligo japonica in autumn, and Crangon hakodatei in winter. The number of species, individuals and biomass were highest in autumn and lowest in winter. The diversity index was highest in summer and lowest in winter. The dominance index was highest in winter and lowest in summer. The richness index was highest in autumn and lowest in winter. The evenness index was highest in summer and lowest in autumn. A cluster analysis showed that demersal organisms were divided into two groups; spring and winter organisms (Group 1) and summer and autumn organisms (Group 2). We detected a significant difference ( P <0.05) between these groups, mainly owing to Platycephalus indicus , Repomucenus koreanus , and Paralichthys olivaceus within Pisces: Trachysalambria curvi - rostris, Metapenaeopsis dalei , P . gravieri , and C . hakodatei within Crustacea: and L . japonica within Cephalopoda.
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