한국 서남해역 시아해의 조하대 저서동물 군집
Subtidal Macrobenthic Community in Shia Sea, Southwest Coast of Korea
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해남반도와 신안 및 진도 사이에 위치한 시아해에서 저서동물 주요 우점종, 군집 구조 및 분포 특성을 파악하고자 49 개 정점을 설정하고 2001년 11월, 2002년 2월, 5월, 8월에van Veen grab (채집 면적 0.1 m2)을 사용하여 각 정점당 2회씩 저서동물을 채집하였다. 퇴적상은 목포구와 인접한 내측해역은 muddy sandy gravel 퇴적상이, 조류가 강한 명랑수도와 인접한 지역은 gravel의 퇴적상이, 우이도 남측 해역에서는 sand muddy의 퇴적상이었다. 퇴적물내의 유기물 함량은0.5~1.5%의 범위로서 평균 약 0.6%였다. 전 조사기간 동안총 271종의 저서동물이 출현하였으며 다모류가 전체의 34% 를 점유하여 가장 우점하였으며, 갑각류가 28%, 연체동물이 21%를 점유하였다. 평균 밀도는 166 ind. m-2였으며, 다모류가 약 40%, 갑각류가 26%를 차지하였다. 생체량은 평균29.2 g m-2로서 연체동물이 44%였다. 입도가 세립한 신안군압해도에서 입도가 조립한 진도군 외측 해역으로 갈수록 출현 종 수, 밀도 및 생체량이 감소하는 경향을 나타내었으며Bio-env 분석 결과 군집은 입도 조성과 유기물 함량에 따라영향을 받는 것으로 나타났다. 주요 우점종으로는 세립질 퇴적상에서는 Photis longicaudata, Septifer keenae, Maldane cristata, Lumbrineris longifolia, Heteromastus filiformis, Coptothyris grayi 등이었다. 집괴 분석 결과 4개의 정점군으로 구분되었으며 SIMPER 분석 결과 정점군 A에서는 Striarca symmetrica, 정점군 B에서는 Glycera chirori, 정점군 C 에서는 Heteromastus filiformis, 정점군 D에서는 Latreutes planirostris가 유사도에 영향을 미쳤다. 이 연구결과로부터시아해의 대형 저서동물 군집은 퇴적상과 이에 수반된 유기물 함량에 따라 영향을 받는 양호한 군집 특성을 보였다.
Abstract
In order to study the community structure and distribution pattern of macrobenthos in the subtidal area of Shia Sea between Haenam peninsula and Shinan-Jindo area at southwest coast of Korea, duplicate sediment samples were taken seasonally by van Veen grab (surface area, 0.1 m2) from 49 stations between November 2001 and August 2002. The surface sediment facies were muddy sandy gravel near Mokpo-Gu channel, gravel in the Myoungrang channel with high tidal currents, and sandy muddy in the southern Uido area. Ignition loss in the sediment ranged from 0.5 to 1.5% with a mean of 0.6%. A total of 271 taxa were collected with a mean density of 166 ind. m-2 and a mean biomass of 29.2 g m-2. Polychaetes were dominant faunal group in terms of species richness and abundance, accounting for 34% and 40% of total species number and abundance, respectively. Molluscs accounted for 44% of biomass. Bio-Env analysis revealed that sediment composition and ignition loss affected the spatial distribution of subtidal microbenthic community in the study area. Major dominant species were Photis longicaudata, Septifer keenae, Maldane cristata, Lumbrineris longifolia, Heteromastus filiformis and Coptothyris grayi. Based on cluster analysis, four station groups were classified. They were associated with sediment types. Bivalve, Striarca symmetrica, polychaetes, Glycera chirori, Heteromastus filiformis and decapod Latreutes planirostris were major contributing fauna in station group A, B, C, and D, respectively. These results suggest that macrobenthic community of the Shia Sea is normally influenced by sediment type and related ignition loss.
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