영광 안마군도 주변 해역 식물플랑크톤 군집의 계절 동태 = Seasonal dynamics of phytoplankton community in the Anma Islands of Yeonggwang (AIY), West Sea, Korea

다국어 초록 (Multilingual Abstract)

A survey was conducted to analyze seasonal dynamics of the phytoplankton community at 22 stations on the surface and bottom layers in the Anma Islands of Yeonggwang (AIY) in the southern West Sea, Korea from the spring of 2020 to the winter of 2021, using a marine survey vessel Ed Ocean. Based on the survey results, there were 87 phytoplankton species in 52 genera, diatoms accounted for 67.8%, dinoflagellates 26.5%, silicoflagellates 3.5%, and cryptomonads and euglenoids accounted for 1.1% each. By season, it was simple in spring and relatively varied in winter. The phytoplankton standing crop on the surface was low (28.8±30.1 cells mL-1) in summer and high (87.0±65.1 cells mL-1) in spring. In the phytoplankton community, diatoms showed a high share (over 80%) throughout the year, and Skeletonema costatum-ls was the dominant species with a dominance of more than 60% in spring and winter, and 34.6% and 24.2% in summer and autumn, respectively. The diversity expressing the characteristics of the community structure was high (2.79±0.45) in autumn and low (1.82±0.18) in spring, unlike the phytoplankton standing crop. However, the dominance was high at (0.86±0.08) in spring and low (0.44±0.13) in autumn. Based on the results of principal component analysis (PCA) using environmental and phytoplankton-related factors, it was estimated that the biological oceanographic environmental characteristics seen through the phytoplankton community in the AIY were dominated by nutrients supplied from open seawater and surface sediments by seawater mixing, such as tidal mixing.

국문 초록 (Abstract)

서해 남부 안마군도 주변 해역 식물플랑크톤 군집의 계절 동태를 파악하기 위하여 2020년 봄부터 2021년 겨울까지 소형 해양조사선 에드오션호를 이용하여 21개 정점의 표층과 저층 해수를 대상으로 현장조사를 하였다. 결과, 출현한 식물플랑크톤 종은 52속 87종으로, 규조류가 67.8%, 와편모조류가 26.5%, 규질편모조류가 3.5%, 그리고 은편모조류 및 유글레나조류가 각 1.1%를 차지하였다. 계절별로 출현 종은 봄에 단순하였고, 겨울에 상대적으로 다양하였다. 표층 현존량은 여름 28.8±30.1 cells mL-1로 낮았고, 봄 87.0±65.1 cells mL-1로 높았다. 식물플랑크톤 군집은 연중 규조류가 80% 이상 높은 점유율을 나타내었고, 우점종은 Skeletonema costatum-ls가 봄과 겨울에 60% 이상 극우점을 보였고, 여름과 가을 각 34.6%와 24.2%로 최우점하였다. 군집구조 특성을 나타내는 다양도 지수는 현존량과 다르게 가을에 2.79±0.45로 높았고, 봄에 1.82±0.18로 낮았다. 그러나 우점도 지수는 봄에 0.86±0.08로 높았고, 가을에 0.44±0.13로 낮았다. 환경인자 및 식물플랑크톤 군집 관련 인자를 이용한 주성분 분석 결과, 식물플랑크톤 군집을 통해 본 안마군도 주변 해역의 생물해양학적 환경 특성은 상대적 개방 해역 및 조석 혼합 등 해수 혼합에 의한 해저 퇴적층에서 공급되는 영양염 등에 의해 지배되는 것으로 추정되었다.

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