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Spatio-temporal Distribution of Phytoplankton Community in the Jangsu Bay and Adjoining Sea of South Sea, Korea

장수만 식물플랑크톤 군집의 시.공간적 분포 특성

  • Yoon, Yang Ho (Faculty of Marine Technology, Chonnam National University)
  • Received : 2014.02.11
  • Accepted : 2014.03.10
  • Published : 2014.03.31

Abstract

This study describes about the spatio-temporal distributions in phytoplankton community such as species composition, standing crop and dominant species from May 2006 to February 2007 in the Jangsu bay and the northwestern parts of Gamak bay. Based on the principal component analysis (PCA) of the environmental factors as well as biological parameters, the bio-oceanographical characteristics were analysed. A total of 83 species of phytoplankton belonging to 47 genera were identified. Whereas diatoms and dinoflagellates occupied more than 65% and 30% of total species, respectively. The annual dominant species were Chaetoceros affinis, Paralia sulcata and Bacillaria paxillifera in spring, Chaetoceros didymus, Ch. affinis and Octactis octonaria in summer, Skeletonema costatum-like species and B. paxillifera in autumn. Moreover phytoplankton cell density was ranged between 3.1 $cells{\cdot}mL^{-1}$ in spring and 521.0 $cells{\cdot}mL^{-1}$ in winter. It fluctuated with an annual mean of 76.0 $cells{\cdot}mL^{-1}$ between the lowest value of 7.6 $cells{\cdot}mL^{-1}$ in spring and the highest value of 220.2 $cells{\cdot}mL^{-1}$ by Skeletonema costatum-like species in winter. Briefly, the phytoplankton cell density in the mixing seasons was higher in comparison with the other seasons. According to the PCA, the biological oceanographic characteristics of the Jangsu bay was affected by the introduction of outside seawater particularly in temperature increasing seasons, and the other seasons, it may be described the light intensity, and mix between inner and outer bay sea waters.

한국 남해안의 중앙부에 위치하는 장수만의 식물플랑크톤 군집의 시 공간적 분포특성과 생물해양학적 환경특성을 파악하기 위한 현장 조사를 2006년 봄부터 겨울까지 계절별로 장수만과 인근해역을 대상으로 하는 31개의 정점의 표 저층 해수를 대상으로 실시하였다. 장수만에서 출현이 확인된 식물플랑크톤은 47속 83종으로 규조류가 65.1%, 와편모조류가 30.1%를 차지하였고, 유해성 조류도 3종 출현하였다. 세포밀도로 표시한 식물플랑크톤 현존량은 봄 3.1 $cells{\cdot}mL^{-1}$에서 겨울 521.0 $cells{\cdot}mL^{-1}$의 범위로 겨울과 여름에 높고, 봄과 가을에 낮았다. 현존량은 정점 평균으로 표층에서 봄 7.6 $cells{\cdot}mL^{-1}$, 여름 68.0 $cells{\cdot}mL^{-1}$, 가을 8.1 $cells{\cdot}mL^{-1}$, 그리고 겨울은 220.2 $cells{\cdot}mL^{-1}$를 나타내었다. 표층에서 우점종은 봄에 Chaetoceros affinis, Paralia sulcata, Bacillaria paxillifera, 여름에 Chaetoceros didymus, Ch. affinis, Octactis octonaria, 가을에 Skeletonema costatum 유사종과 B. paxillifera이 10% 이상의 우점률을 나타내었고, 겨울은 S. costatum 유사종에 의해 극우점 되었다. 주성분분석에 의한 장수만의 생물해양학적 특성은 봄과 여름의 수온 상승기에는 봇돌바다 등 개방해역에서 유입되는 해수 영향으로 높은 생물생산을 유지하고 있고, 가을과 겨울의 수온 하강기에는 생물량은 수심의 얕은 천해해역에서 높고, 현존량은 수로부에서 높은 밀도를 나타내었다. 특히 겨울은 해수 혼합의 원활한 천해해역에 높은 식물플랑크톤 생산을 나타내었다.

Keywords

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