Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Seasonal Changes in Phytoplankton Community Associated with Marine Environmental Factors in the Yellow Sea in 2019

2019년 황해 해역에서 계절적 해양 환경특성에 따른 식물플랑크톤 군집 구조 변화양상

  • Kyung-Woo Park (Oceanic Climate & Ecology Research Division, National Institute of Fisheries Science) ;
  • Tae-Gyu Park (Oceanic Climate & Ecology Research Division, National Institute of Fisheries Science) ;
  • Hyo-Keun Jang (Oceanic Climate & Ecology Research Division, National Institute of Fisheries Science) ;
  • Man-Ho Yoo (HAERANG Technology and Policy Research Institute) ;
  • Kwang-Seok O (Hae On Plankton Ecology Research Institute) ;
  • Seok-Hyun Youn (Oceanic Climate & Ecology Research Division, National Institute of Fisheries Science)
  • 박경우 (국립수산과학원 기후변화연구과 ) ;
  • 박태규 (국립수산과학원 기후변화연구과 ) ;
  • 장효근 (국립수산과학원 기후변화연구과 ) ;
  • 유만호 ((주)해랑기술정책연구소 ) ;
  • 오광석 (해온부유생태연구소) ;
  • 윤석현 (국립수산과학원 기후변화연구과 )
  • Received : 2024.08.08
  • Accepted : 2024.08.29
  • Published : 2024.08.31
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Abstract

We carried out a field survey to analyze the spatial distributions of phytoplankton communities at 15 stations in the Yellow Sea in 2019. Diatoms exhibited a high appearance rate in winter and spring, whereas small flagellates(<20 ㎛) showed a high appearance rate in summer and autumn. This change in the phytoplankton-community structure may be ascribed to low nutrient concentrations in the area, especially of phosphate, which was below the detection limit, seriously hampering the phytoplankton growth. The composition ratio of picophytoplankton was high in the surface mixed layer in summer and autumn when the water columns exhibited strong stratification. Redundancy analysis revealed strong negative correlations between nutrients (NO3-, PO43-) and water depth. In conclusion, the reduction in nutrients in the surface mixed layer owing to the strengthening of stratification in summer and autumn creates favorable conditions for the growth of relatively small phytoplankton with low nutrient requirements, leading to a shift towards a smaller phytoplankton-community structure.

황해 식물플랑크톤의 계절별 군집 구조와 해양환경 요인과의 상관관계를 파악하기 위하여 2019년 계절별로 15개 정점에 대해 조사하였다. 동계와 춘계에는 규조류가 높은 출현율을 나타내었으며, 하계와 추계에는 20㎛ 이하의 미동정 미소편모조류가 높은 출현율을 나타내었다. 이는 낮은 농도의 영양염류로 인한 것으로, 특히 인산염의 경우 검출 한계까지 낮게 나타남에 따라 식물플랑크톤 성장에 심각한 저해 현상을 가져온 것으로 판단된다. 성층이 강화되는 하계와 추계 표층 혼합층에서 초미소형 크기의 식물플랑크톤 기여도가 높았으며, 중복분석 결과 초미소형 크기의 식물플랑크톤은 영양염(질산염, 인산염) 및 수심에 대해 강한 음의 상관성을 나타내고 있었다. 결론적으로 하계와 추계 성층 강화로 인한 표층 혼합층 내에서의 영양염 감소는 영양염류의 요구량이 낮은 상대적으로 크기가 작은 식물플랑크톤 성장에 유리한 환경을 제공하며, 식물플랑크톤 군집 구조는 소형화가 진행된 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 국립수산과학원 "유해생물 수산피해 대응 연구(R2024040)"의 일환으로 수행되었으며, 현장 조사 및 분석에 협조해 주신 탐구 8호 승무원 및 과제 관련 연구원들게 감사드립니다.

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