영일만 형망어업 어획물의 종조성 및 분포 특성
Species composition and distribution property of dredge fishery in Yeongil Bay, Korea
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초록
본 연구는 동해남부에 위치한 영일만에서 형망어구에 어획된 수산생물의 종조성과 분포특성을 보기위해 계절별로 2015년 2월에서 11월까지 조사하였다. 어획된 생물의 종은 총 35과 44종으로, 어류 13종, 갑각류 10종, 극피동물 5종, 복족류 5종, 두족류 4종, 이매패류 3종 등이 출현하였다. 주어획 생물인 패류의 계절변동은 겨울과 봄에 피조개 (Scapharca broughtonii)의 어획량이 증가한 반면 아담스백합 (Callithaca adamsi)은 여름과 가을에 어획량이 증가하였다 종다양도 지수 (H′)는 봄에 1.99로 가장 높았으며, 여름에 0.34로 가장 낮게 나타났다. 종수의 자료를 이용하여 유사도분석은 fourth root로 변환하였으며, 군집분석과 다차원척도분석(MDS)을 보았을 때, 총 2개의그룹으로 겨울과 봄(Group A), 여름과 가을(Group B)로 나누어졌다.
Abstract
The species composition and distribution of catches by dredge gear in the Yeongil Bay, Korea were investigated on a seasonal basis from February to November, 2015. Total catches consisted of 44 species and 35 families. They were 13 species of fish, 10 species of crustacea, 5 species of echinodermata, 5 species of gastropoda, 4 species of cephalopoda and 3 species of bivalvia. Major catch species was shellfish and had seasonal variations in catch. In spring and winter, the catch of ark shell (Scapharca broughtonii) was increased. Adversely, the catch of admas venus clam (Callithaca adamsi) increased in sunmmer and autumn. Species diversity indices was high as the value of 1.99 in spring, and low to the value of 0.34 in summer. In addition, multi dimentional scaling (MDS) indices also was high in spring as the value of 1.99. In summer, the index was low as the value of 0.34. Similarity analysis based on species data was transformed by fourth root. With the result of cluster analysis and MDS analysis, species was divided into two groups. The first group as Group A consists of winter and spring species and another was Group B made of species in summer and winter.
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