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

The Korean Society of Oceanography (한국해양학회)
권호 표지

Spatial Distribution of Benthic Macrofaunal Community in Ulsan Bay and Onsan Bay, Eastern Coast of Korea

울산만과 온산만 저서동물군집의 공간분포

  • 윤성명 (조선대학교 생물교육과) ;
  • 고철환 (서울대학교 지구환경과학부) ;
  • 신현출 (여수대학교 해양학과)
  • Published : 2001.08.31
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Abstract

This study was conducted to investigate the macrobenthic community in Ulsan Bay and Onsan Bay, in November of 1997. The density of benthic animals was 535 md./m2, and the number of species was 117. Polychaeta was the most dominant faunal group, comprising a total of 63 species, and its density was 380 md./m2 The most dominant benthic macrofauna was Cirratulrus cirratulas (2.7%), and followed by Tharyx sp. (16.6%), Ruditapes philippinarum (16.1%), Lumbrineris longifolia (10.3%) and so on. The dominant species occupied their distinct unique distribution area. Tharyx sp., R. philippinarum and Grandidierella sp.1 occurred mainly in Ulsan Bay, L. longifolia and Euchone sp. in Onsan Bay, and C. cirratulas and Cirriforimia tentaculata in both bays. By cluster analysis, study area was divided into 4 station groups: Northern Ulsan Bay (Al), the middle area of Ulsan Bay (Bl), offsea area between Ulsan Bay and Onsan Bay (Bll), and Onsan Bay (C). Northern Ulsan Bay was characterized by low species number and high density. The dominant species were C. cirratulas R. philippinarum and Tharyx sp. The middle area of Ulsan Bay was by low species number and density, and its characteristic species was Grandidierella sp.1. The offsea area between Ulsan and Onsan Bay was by high species number and low density. Onsan Bay was by high species number and high density, and its important species were L. longifolia and Euchone sp.

1997년 11월에 울산만과 온산만의 저서동물군집을 파악하기 위한 연구가 실시되었다 저서동물군집의 평균서식밀도는 535 개체/$m^2$이었으며, 출현종수는 117종이었다. 이 중 다모류가 최우점 동물군이었으며, 출현종수는 총 63종, 서식밀도는 380 개체/$m^2$이먼다. 다모류를 비롯한 저서동물은 울산만 상단과 온산항에서 가장 서식밀도가 높았으며 , 두 만의 사이 해역에서 낮았다. 저서동물중 주요 우점종은 Cirratulrus cirratulas(22.7%), Tharyx sp.(16.6%), Ruditapes philippinarum(16.1%), Lumbrineris longifolia(10.3%) 등이다. 본 조사해역의 가장 큰 특징은 우점종들의 특정 분포 해역이 뚜렷이 차이가 난다는 것으로, 울산만에서는 Tharyx sp., R. philippinarum, Grandidierella sp.1가, 온산만에서는 L. longifolia, Euchone sp.가, 그리고 두 만에 공통적으로 C. cirratulus, Cirriforimia tentaculata 가 우점하고 있다. 집괴분석 결과, 조사해역은 크게 4개의 해역-울산만 북단, 울산만 중앙역, 울산만과 온산만 사이 외해역 , 온산만-으로 대별되었다. 울산만 북단 정점군은 저서동물의 출현종수는 적으나, 서식밀도가 가장 높은 지역으로, C. cirratulus, R. philippinarum, Tharyx sp.가 주요 우점종이다. 울산만 중앙역 정점군은 갑각류 Grandidierella sp.1가 특징적으로 출현하고 있다. 울산만과 온산만 사이 외해역은 저서동물의 서식밀도가 매우 빈약한 해역이나, 출현종수는 매우 많다. 온산만 정점군은 출현종수도 많으며, 서식밀도도 매우 높다. 대표적 종은 고. L. longifolia와 Euchone sp.이다.

Keywords

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