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

The Korean Society of Oceanography (한국해양학회)
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Macrobenthic Community Structure Along the Environmental Gradients of Ulsan Bay, Korea

울산만의 저서환경 구배에 따른 저서동물군집 구조

  • Yoon, Sang-Pil (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI)) ;
  • Jung, Rae-Hong (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI)) ;
  • Kim, Youn-Jung (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI)) ;
  • Kim, Seong-Gil (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI)) ;
  • Choi, Min-Kyu (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI)) ;
  • Lee, Won-Chan (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI)) ;
  • Oh, Hyun-Taik (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI)) ;
  • Hong, Sok-Jin (Marine Environment Management Division, National Fisheries Research & Development Institute(NFRDI))
  • 윤상필 (국립수산과학원 환경관리과) ;
  • 정래홍 (국립수산과학원 환경관리과) ;
  • 김연정 (국립수산과학원 환경관리과) ;
  • 김성길 (국립수산과학원 환경관리과) ;
  • 최민규 (국립수산과학원 환경관리과) ;
  • 이원찬 (국립수산과학원 환경관리과) ;
  • 오현택 (국립수산과학원 환경관리과) ;
  • 홍석진 (국립수산과학원 환경관리과)
  • Published : 2009.05.31
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Abstract

This study was carried out to investigate the extent to which benthic environment of Ulsan Bay was disturbed by organic materials and trace metals from the megacity and industrial complex. Field survey for benthic environment and macroinvertebrate community was seasonally conducted from February to November 2006 at nine stations covering the inside and outside of the bay. TOC was on average 1.7% while four (As, Cu, Pb, Zn) out of seven trace metals measured exceeded the Effects Range Low (ERL) in most of the stations. Total number of species sampled was 199 and mean density was 4,578 ind./$m^2$, both of which were greatly dominated by the polychaetes. Dominant species were Aphelochaeta monilaris (22.6%), Ruditapes philippinarum (17.1%), Magelona japonica (12.2%), Lumbrineris longifolia (9.9%) and their distribution was ruled by the difference in the benthic environmental condition of each station. From the multivariate analyses, four stational groups were identified: northern part of the bay, middle and lower part of the bay, the intersection of Taewha River and Gosa stream and outside of the bay. As a result, the community heterogeneity of inner bay was much more greater than that of outer bay. SIMPER analysis showed that four groups were represented by R. philippinarum-Capitella capitata, A. monilaris-Balanoglossus carnosus, Sinocorophium sinensis-Cyathura higoensis and M. japonica-Ampharete arctica, respectively. Spatio-temporal changes of macroinvertebrate communities in Ulsan Bay were closely related to those of depth, mean grain size and organic content, and Zn was also a meaningful factor in that context.

본 조사는 유기물과 미량금속 오염이 의심되는 울산만에서 저서환경의 교란 유무와 정도를 파악하기 위해 수행되었다. 현장조사는 울산만 안팎에 선정된 9개 정점에서 2006년 2월부터 11월까지 계절별로 저서환경과 대형저서동물군집에 대해 동시에 이루어졌다. 유기물 함량(TOC)은 평균 1.7% 이었으며 미량금속 중 As, Cu, Pb, Zn의 농도는 거의 모든 정점에서 최소영향수준(ERL)을 초과하였다. 저서동물군집의 총 출현종수는 199종, 평균 서식밀도는 4,578 개체/$m^2$ 이었으며 다모류가 가장 우세한 동물군이었다. 주요 우점종은 Aphelochaeta monilaris(22.6%), Ruditapes philippinarum(17.1%), Magelona japonica(12.2%), Lumbrineris longifolia(9.9%) 등이었으며 정점별 환경 특성에 따라 뚜렷이 다른 분포 양상을 보였다. 다변량분석 결과, 울산만 상단, 내만역, 내만역 중 태화강과 고사천이 만나는 지점 그리고 외해역에서 서로 다른 4개의 군집이 확인되었으며 특히 울산만 내의 군집 이질성이 두드러지게 나타났다. SIMPER 분석 결과, 4개 군집에서는 각각 R. philippinarum-Capitella capitata, A. monilaris-Balanoglossus carnosus, Sinocorophium sinensis-Cyathura higoensis 그리고 M. japonica-Ampharete arctica가 특징적으로 출현하였다. 전체 군집의 종조성과 밀도의 시.공간적 변화에 대해 가장 밀접한 상관성을 보인 환경 요인은 수심, 입도, 유기물 함량이었으며 중금속 중 Zn도 주요 항목에 포함되었다.

Keywords

References

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