Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Community Structure of Macrobenthic Assemblages near Uljin Marine Ranching Area, East Sea of Korea

울진 바다목장 주변해역 연성기질 조하대에 서식하는 대형저서동물의 군집구조

  • Hwang, Kangseok (Fisheries Resources Management Division, National Fisheries Research and Development Institute) ;
  • Seo, In-Soo (Korea Benthos Research Center, Co., Ltd.) ;
  • Choi, Byoung-Mi (Korea Benthos Research Center, Co., Ltd.) ;
  • Lee, Han Na (Department of Marine Biology, Pukyong National University) ;
  • Oh, Chul Woong (Department of Marine Biology, Pukyong National University) ;
  • Kim, Mi Hyang (Ocean-Tech Marine Institute) ;
  • Choi, Chang Gun (Department of Ecological Engineering, Pukyong National University) ;
  • Na, Jong Hun (Korea Benthos Research Center, Co., Ltd.)
  • Received : 2014.09.01
  • Accepted : 2014.11.04
  • Published : 2014.12.31
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Abstract

In this study, we investigated the macrobenthic community structure and spatiotemporal variations in Uljin Marine Ranching area, East Sea of Korea. Macrobenthos were collected using a modified van Veen grab sampler from April to September 2013. Total number of species sampled was 345 and mean density was 5,797 ind. $m^{-2}$, both of which were dominated by the polychaetes. The most dominant species were Spiophanes bombyx (53.64%), followed by Magelona sp.1 (6.96%), Cadella semitorta (2.73%), Lumbrineris longifolia (2.16%) and Alvenius ojianus (2.08%). Cluster analysis and nMDS ordination analysis based on the Bray-Curtis similarity identified 2 station groups. The group 1 (station 2, 3, 5, 6, 8 and 9) was characterized by high abundance of the polychaetes Magelona sp.1, Lumbrineris longifolia, Scoloplos armiger, Praxillella affinis, Maldane cristata and the bivalve Alvenius ojianus, with fine sediment above 30m water depth. On the other hand, the group 2 (station 1, 4, 7 and 10) was numerically dominated by the polychaete Lumbrineriopsis sp. and the bivalve Cadella semitorta, with coarse sediment below 5m water depth. Collectively, the macrobenthic community structure showed a distinct spatial trend, which seemed to be related to the water depth and sediment composition.

본 연구는 울진 바다목장 해역에서 서식하는 대형저서동물의 생물다양성, 개체수 및 군집구조를 파악하기 위하여 실시되었다. 연구해역 연성기질 조하대에서 출현한 대형저서동물은 345종 $8m^{-2}$에 단위면적당($m^{-2}$) 출현 개체수는 5,797개체이었다. 분류군별 출현 종수와 개체수에 있어서는 환형동물의 다모류가 각각 154종, 44.64%와 193,320개체, 83.37%의 점유율을 나타내 가장 우점하는 생물이었다. 한편 연구해역의 주요 우점종으로 다모류의 민얼굴갯지렁이(Spiophanes bombyx)는 124,385개체 (평균 $3,110{\pm}4,434$개체 $m^{-2}$), 53.64%의 점유율을 나타내었고, 다음으로 Magelona sp.1이 16,130개체 (평균 $403{\pm}926$개체 $m^{-2}$)로 6.96%를 차지하였다. 이 밖에 이매패류의 Cadella semitorta, 다모류의 긴자락송곳갯지렁이(Lumbrineris longifolia) 및 이매패류의 겨자씨조개 (Alvenius ojianus)의 순서로 각각 6,325개체(2.73%), 5,010개체 (2.16%) 및 4,820개체 (2.08%)가 출현하였다. 한편 출현 종과 개체수의 자료를 근거로 대형저서동물의 군집구조 분석을 실시한 결과, 크게 2개의 그룹과 1개의 정점 (5월의 정점 4)으로 구분되었다. 이 가운데 그룹 1은 모든 조사시기의 정점 2, 3, 5, 6, 8 및 9가 포함되었고, 환경적으로 30~60 m 내외의 수심과 세립질 퇴적물이 우세한 정점들이라는 공통점이 있었다. 또한 본 그룹에 속하는 대형저서동물은 총 282종(평균 $66{\pm}15$종)과 7,471개체 $m^{-2}$의 밀도에 다모류의 Magelona sp.1, 긴자락송곳갯지렁이, 삼각모자갯지렁이(Scoloplos armiger), 꼬리대나무갯지렁이 (Praxillella affinis), 민숭대나무갯지렁이 (Maldane cristata)와 겨자씨조개 등이 주요한 구성종이었다. 반면 그룹 2는 모든 조사시기의 정점 1, 4, 7 및 10으로 구성되었고, 환경적으로 수심과 퇴적상은 각각 5m 내외의 조립질 퇴적물이 우세한 정점들이었다. 또한 생물적으로는 181종 (평균 $37{\pm}18$종)과 3,287개체 $m^{-2}$를 나타내었고, 주요 우점종은 이매패류의 Cadella semitorta와 다모류의 Lumbrineriopsis sp.이었다. 이상을 종합해 보면, 연구해역에 서식하는 대형저서동물 군집은 연안으로 부터의 이격정도와 그에 따른 수심과 퇴적물의 조성차이에 의해 그 구조를 달리하고 있었다.

Keywords

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