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Effects of Physicochemical and Environmental Factors on Spatial and Temporal Variations in Phytoplankton Pigment and its Community Composition in Jinhae Bay

진해만에서 물리화학적 환경요인이 식물플랑크톤 색소 및 군집조성의 시공간적 변화에 미치는 영향

  • Na, Sujin (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Lee, Jiyoung (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Kim, Jeong Bae (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Koo, Jun-Ho (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Lee, Garam (Marine Environment Research Division, National Institute of Fisheries Science) ;
  • Hwang, Hyunjin (Marine Environment Research Division, National Institute of Fisheries Science)
  • 나수진 (국립수산과학원 어장환경과) ;
  • 이지영 (국립수산과학원 어장환경과) ;
  • 김정배 (국립수산과학원 어장환경과) ;
  • 구준호 (국립수산과학원 어장환경과) ;
  • 이가람 (국립수산과학원 어장환경과) ;
  • 황현진 (국립수산과학원 어장환경과)
  • Received : 2021.03.03
  • Accepted : 2021.04.27
  • Published : 2021.04.30

Abstract

The aim of this study was to investigate the spatial and temporal distribution of phytoplankton biomass and community composition in Jinhae Bay on the southern coast of Korea. Phytoplankton pigment analysis was conducted using ultra performance liquid chromatography (UPLC) were conducted from April to December 2019 at seven stations. Temperature, salinity, and dissolved oxygen (DO) and inorganic nutrients (dissolved nitrogen, dissolved phosphorus, and orthosilicic acid) were measured to investigate the environmental factors associated with the structure of phytoplankton community. Phytoplankton biomass (Chl-a) was the highest in July (mean 15.4±4.3 ㎍/L) and the lowest in December (mean 3.5±0.6 ㎍/L). Fucoxanthin was the most abundant carotenoid and showed a similar variation pattern to Chl-a, peridinin, and Chl-b. Phytoplankton community composition analysis showed that diatoms were a predominant group with an average abundance of 70 % whereas chlorophytes, cryptophytes, and dinoflagellates often appeared with lower averages. Further, the dominance of diatoms was closely correlated with water temperature and N:P ratio, which might be influenced by high temperatures in the summer and nutrient loading from the land. Additionally, freshwater and nutrient input by rainfall was estimated to be the most important environmental factor. Hence, the spatial and temporal variations in the composition of phytoplankton pigments and phytoplankton community were correlated with physicochemical and environmental parameters.

본 연구에서는 ultra performance liquid chromatography(UPLC)를 이용하여 진해만의 식물플랑크톤 생체량 및 군집구조의 시공간적 분포에 미치는 환경요인의 영향을 조사하였다. 이를 위해 2019년 4월에서 12월까지 총 5회에 걸쳐 7개 정점에 대한 식물플랑크톤 색소분석과 수온, 염분, 용존산소(DO), 영양염(DIN, DIP, Si(OH)4) 등의 환경요인 분석을 행하였다. 조사기간 중 식물플랑크톤의 생체량(Chl-a)은 7월(평균 15.4±4.3 ㎍/L)에 가장 높았고, 12월(평균 3.5±0.6 ㎍/L)에 가장 낮았다. 보조색소의 경우 fucoxanthin이 가장 많이 검출되었고 그 다음으로 peridinin, Chl-b 순으로 나타났으며, 이들의 월 변동은 Chl-a와 유사한 경향을 보였다. 식물플랑크톤 군집분석결과, 규조류가 평균 70 %로 가장 우점하였으나, 일부 녹조류, 은편모조류, 와편모조류가 출현하기도 하였다. 우점종인 규조류는 특히 수온 및 N:P ratio와 밀접하게 연관되어 있어서 여름철 고온환경 및 육상으로부터의 영양염 유입에 민감하게 반응하는 것으로 추론되었다. 또한 식물플랑크톤 색소 및 종조성은 전반적으로 계절에 따른 물리화학적 환경요인의 변화 및 지형적 특성과 연관되어 있으며 강우로 인한 담수 및 영양염 공급에 큰 영향을 받는 것으로 추정되었다.

Keywords

Acknowledgement

이 논문은 2021년도 국립수산과학원 수산과학연구사업(R2021055)의 지원을 받아 수행된 연구입니다. 본 논문을 세심하게 검토해주신 심사위원분들께 감사드립니다.

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