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Spatial Distribution of Macrozoobenthic Organisms along the Korean Coasts in Summer Season

한국 연안의 하계 대형저서동물의 공간분포

  • LEE, JUNG-HO (Department of Marine Biotechnology, Anyang University) ;
  • LIM, HYUN-SIG (Department of Marine and Fisheries Sciences, Mokpo National University) ;
  • SHIN, HYUN CHOOL (Department of Ocean Integrated Science, Chonnam National University) ;
  • RYU, JONGSEONG (Department of Marine Biotechnology, Anyang University)
  • 이정호 (안양대학교 해양바이오공학전공) ;
  • 임현식 (목포대학교 해양수산자원학과) ;
  • 신현출 (전남대학교 해양융합과학과) ;
  • 류종성 (안양대학교 해양바이오공학전공)
  • Received : 2021.06.01
  • Accepted : 2022.05.17
  • Published : 2022.05.31

Abstract

To clarify the spatial distribution pattern of macrozoobenthos in Korean coastal waters in the summer season and investigate the relationship between community structure and benthic environmental factors, field surveys on community structure and benthic environmental factors were conducted at 117 stations in August 2017. A total of 613 macrobenthic species were identified, with the mean density of 1,228 ind./m2 and the mean biomass (wet weight) of 110.9 g WW/m2. Rich biodiversity was found at stations near Wando and along the coast of the East Sea, and there is a trend that stations with greater biodiversity also showed higher mean density as well. The dominant species in all the coastal areas in Korea was Heteromastus filiformis, which were found at most of the stations during the survey. The relatively deep areas in the East Sea were dominated by Magelona johnsoni and Maldane cristata, which were the third and ninth dominant species in the study areas, respectively. Pseudopolydora kempi and Rhynchospio sp. were observed only at the station located in the Nakdong River estuary. From the cluster analysis the stations could be clustered into three station groups with more similar faunal composition. Group A was located in the eastern coast, characterized with deep water depth and low levels of sand contents, while Group B was located in the southern coast, characterized by shallow depth of water and high content of mud and organic matter. Lastly, Group C was in the western coast, demonstrating low levels of mud content and organic matters. The biodiversity of macrobenthic species in the study area showed high positive correlation coefficients with benthic environmental factors such as sorting, clay, silt, and contents of organic matter in sediments, but negatively correlated with the sand contents. Major dominant species, Theora lata and Eriopisella sechellensis, both showed negative correlation coefficients with the sand contents, but a relatively high positive correlation with the levels of organic contents.It can be concluded that the spatial distribution patterns of macrobenthic organisms in Korean coastal waters are affected by depth, sediment type, and contents of organic matters.

우리나라 연안해역의 하계 대형저서동물의 공간분포를 파악하고 군집구조와 저서환경요인간의 연관성을 밝히기 위하여, 2017년 8월 총 117개 정점에서 대형저서동물 군집과 저서환경요인을 조사하였다. 조사 결과 대형저서동물의 총 출현종수는 613종이었으며, 평균 서식밀도는 1,228 개체/m2, 평균 생물량(습중량)은 110.9 g WW/m2으로 나타났다. 남해의 완도해역과 동해 해역에서 많은 출현종수를 보였으며, 출현종수가 많은 정점에서 동시에 높은 밀도를 보였다. 우리나라 전해역에서 최우점종으로 출현한 종은 고리버들갯지렁이인 Heteromastus filiformis 이며, 이종은 대부분의 정점에서 출현하였다. 상위 우점종 중 동해해역의 비교적 수심이 깊은 정점들에서 높은 밀도로 출현한 종은 양손갯지렁이류인 Magelona johnstoni 및 대나무갯지렁이류인 Maldane cristata 이며, 각각 3위 및 9위의 우점순위를 차지하였다. 특징적으로 얼굴갯지렁이류인 Pseudopolydora kempi와 Rhynchospio sp.는 낙동강 하구에 위치한 정점에서만 높은 밀도로 출현하는 양상을 보였다. 집괴분석 결과 지리적으로 3개의 정점군으로 구분되었으며, 수심이 깊고 니질함량이 많은 정점군인 동해해역(정점군 A), 니질함량과 유기물함량이 많지만 비교적 수심이 얕은 정점군인 남해해역(정점군 B), 니질함량과 유기물함량이 적은 정점군인 서해해역(정점군 C)으로 구분되었다. 대형저서동물 출현종수는 분급도, 실트함량, 니질함량, 유기물함량과 높은 양의 상관관계를 보였으며, Sand 함량과는 음의 상관관계를 보였다. 남해해역에서 비교적 높은 밀도로 출현하는 Theora lata와 Eriopisella sechellensis는 유기물함량과 비교적 높은 양의 상관관계를 보였으며, Sand 함량과 비교적 높은 음의 상관관계를 보였다. 결론적으로, 우리나라 연안의 하계 대형저서동물의 공간분포는 수심, 퇴적상, 퇴적물의 유기물 함량에 의해 영향을 받는 것으로 판단된다.

Keywords

Acknowledgement

이 논문은 2021년 해양수산부의 재원으로 해양수산과학기술진흥원의 '과학기술기반 해역이용영향평가 기술개발(2021-0427)'과 해양환경공단의 '국가해양생태계종합조사'의 지원을 받아 수행된 연구입니다. 본 과제의 현장조사 및 시료분석에 기여해 주신 다수의 연구자와 현장조사 선박을 운영해주신 분들께 감사드립니다.

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