The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Spatio-temporal Distribution of Benthic Polychaetous Communities and Their Health Conditions in Garolim Bay, West Coast of Korea

가로림만 저서다모류군집의 시·공간 분포 및 건강 상태

  • Wi, Chan Woo (Ocean Graphic Ocean Environment Division) ;
  • Lee, Jung Ho (Deprtment of Marine Biotechnology, Anyang University) ;
  • Shin, Hyun Chool (Faculty of Marine Technology, Chonnam Natinal University)
  • 위찬우 ((주)오션그래픽 해양환경팀) ;
  • 이정호 (안양대학교 해양바이오시스템공학과) ;
  • 신현출 (전남대학교 해양기술학부)
  • Received : 2014.08.21
  • Accepted : 2014.10.16
  • Published : 2014.11.28
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Abstract

This study was carried out to estimate the benthic environments and polychaetous community in Garolim Bay, through five field surveys from April 2006 to April 2007. Garilim Bay is a semi-enclosed bay and composed of a biramous tidal channel and nearby wide tidal flats. Surface sediment in the inner bay was composed of fine grained particles whereas that in the mouth area of bay was of coarse grained ones. Benthic polychaete worms were the most dominant taxa occupying 65.1% of total benthic macrofauna. Species number was higher in the inner bay than mouth and outer area of bay, and in the bay higher on the tidal flat than channel area. Density was higher on the tidal flat than channel area. Dominant polychaetous species were Prionospio sp., Heteromastus filiformis, Lumbrineris longifolia and so on, which is known as opportunistic species. Prionospio sp. and H. filiformis inhabited mainly on the tidal flats in inner bay, while L. longifolia in the channel area and mouth of the bay. Cluster analysis and nMDS showed the typical inner-to-outward distribution of station groups, which indicated the sequential difference of the species composition of each station group. To assess the benthic healthiness of Garolim Bay by AMBI and BPI analysis, the benthic condition was analyzed from slightly polluted in the outer and mouth of the bay to moderately polluted in the inner bay. Assumed from dominant species composition and benthic healthiness condition, benthic environments of Garolim Bay was slightly unstable and disturbed and organic enrichment was currently underway by massed fisheries farms.

가로림만 저서다모류군집의 특성을 파악하기 위하여 2006년 4월부터 2007년 4월까지 5회에 걸쳐 현장조사를 실시하였다. 가로림만은 반폐쇄성 매만으로 2분지형의 수로를 통해 해수의 유출입이 일어나며 수로 주변으로 넓은 갯벌이 형성되어 있다. 저서다모류는 전체 대형저서동물군집중 개체수에 있어서 65.1%를 차지하는 우점 동물군이었다. 출현종수는 내만역이 만입구나 외해역에 비해, 그리고 갯벌 지역이 수로 지역에 비해 많은 편이었다. 서식밀도 역시 수로 지역보다 갯벌 지역에서 높았다. 주요 우점다모류는 기회주의종으로 잘 알려진 Prionospio sp., Heteromastus filiformis, Lumbrineris longifolia 등이었다. Prionospio sp.와 H. filiformis는 주로 내만역의 갯벌에 주로 서식하였고, 반면 L. longifolia는 수로지역과 만 입구역에 서식하였다. 집괴분석과 nMDS 분석 결과 정점군들은 내만역에서 외해쪽으로의 분포 경향을 보였으며, 이는 각 정점군의 종조성이 순차적으로 차이가 남을 의미한다. AMBI와 BPI를 이용하여 가로림만의 저서 환경 건강도를 평가한 결과 만 입구역에서는 약간 오염(slightly polluted)된 정도이었으나, 내만역으로 들어갈수록 중간정도의 오염(moderately polluted) 상태를 보여주었다. 우점종의 종조성과 저서건강도 상태를 고려해볼 때, 가로림만의 저서환경은 약간 불안정하고 교란이 진행되고 있는 상태이며, 대규모 양식장들로 인한 유기물오염이 현재 진행되고 있는 것으로 판단된다.

Keywords

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