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

The Korean Society of Oceanography (한국해양학회)
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Appearance of Cold Water and Distribution of Zooplankton off Ulsan-Gampo area, Eastern Coastal Area of Korea

울산-감포 해역의 냉수 출현과 동물플랑크톤 분포

  • Lee, Chang-Rae (Department of Oceanography, Chungnam National University) ;
  • Park, Chul (Department of Oceanography, Chungnam National University) ;
  • Moon, Chang-Ho (Department of Oceanography, Pukyong National University)
  • Published : 2004.05.01
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Abstract

Appearance of cold water in the coastal area off Ulsan-Campo, Southeastern coast of Korea, during summer has been well observed. To see the effect of this cold water on zooplankton distribution, we have collected zooplankton at 4 to 8 sites in the near coast as well as off coast for three times about two weeks of interval from July to August, 2001. Appearance of cold water was confirmed and total of about 195 zooplankton taxa were identified. Both the numbers of taxa appeared and zooplankton abundances did not show significant difference among the three sampling periods. On the other hand, the numbers of taxa appeared were generally greater in off coastal area while zooplankton abundances were greater in the near coastal area. These two variables showed different relationship with seawater temperatures. That is, the numbers of taxa appeared showed positive correlation with seawater temperatures (p<0.05) but abundances showed no significant relationship (p>0.05) with seawater temperatures of which variations were comparable with seasonal variations. It was postulated that the upwelling induced appearance of cold water enriched the nutrients, enhanced phytoplankton production and then provided better food conditions for smaller zooplankton in the near coastal part of this study area. In this context it was postulated that zooplankton distribution in the upwelling area might be controlled by food condition rather than seawater temperatures in spite of the large temperature variations caused by the appearance of cold water.

여름철 울산-감포 연안 해역은 냉수대가 출현하는 지역으로 잘 알려져 있다. 이 지역에 출현하는 냉수대와 동물플랑크톤 분포의 관계를 파악하기 위해 2001년 7월 중순부터 8월 초까지 연안과 외양 4개, 총 8개 정점에서 약 2 주간의 간격으로 세 차례에 걸쳐 채집을 실시하였다. 여름철 냉수대가 출현한 울산-감포 해역에서 동물플랑크톤은 약 195개 분류군이 출현하였다. 출현 분류군 수와 동물플랑크톤 개체수의 채집 시기에 따른 차이는 유의적이지 않았지만(ANOVA, p>0.05), 분류군 수는 외양역에서, 총 개체 수는 연안역에서 높은 값을 보였다. 수온 변화에 따른 변동에서는 출현 분류군 수는 수온 증가에 따라 증가하는 양상을 보였지만(p<0.05), 출현 개체 수는 수온과의 관계가 유의적이지 않았다(p>0.05). 비슷한 시기에 계절 변동에 준하는 큰 수온 변동이 있었음에도 생물량과 수온 관계가 유의적이지 않고 연안 정점들에서 상대적으로 많은 생물량이 나타났다. 용승에 의한 냉수의 출현은 연안역에 풍부한 영양염을 공급하고 이로 인해 높은 생산력이 유지되어 동물플랑크톤에 풍부한 먹이를 제공함으로써 많은 동물플랑크톤 생물량을 초래할 것으로 여겨진다. 따라서, 이 지역 동물플랑크톤의 분포는 큰 수온 변동에도 불구하고 수온보다는 먹이 조건이 더 큰 분포의 영향 요인이 될 수 있을 것으로 여겨진다.

Keywords

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