Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

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Spatio-temporal Variations of Marine Environments and Phytoplankton Community in the Gochang Coastal Waters (GCW) of Southern West Sea in Korea

서해 남부, 고창연안해역의 해양환경 및 식물플랑크톤 군집의 시·공간 변동특성

  • Yoon, Yang Ho (Dept. of Ocean Covergence Science, Chonnam National University)
  • 윤양호 (전남대학교 해양융합과학과)
  • Received : 2020.07.20
  • Accepted : 2020.11.06
  • Published : 2020.11.30
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Abstract

This study conducted a seasonal survey to analyze the spatio-temporal variations of marine environments and phytoplankton community in Gochang Coastal Waters (GCW) from August 2016 to April 2017. In the results, the water temperature ranged from 2.1℃ to 34.5℃, showing a large seasonal variation, but the salinity changed from 31.14 psu to 32.64 psu. Therefore, the seasonal variations of water types in GCW were mainly determined by water temperature. The phytoplankton community consisted of 53 genera and 86 species, showing a relatively simple distribution. The phytoplankton cell density ranged from 2.2 to 689.2 cells mL-1, with an average of 577.2 cells mL-1, which was low in autumn and high in winter. The seasonal succession of phytoplankton dominant species was mainly diatoms during the whole year, Leptocylindrus danicus, Chaetoceros curvisetus, Skeletonema costatum-ls in summer, Paralia sulcata, Eucampia zodiacus in autumn, S. costatum-ls, Thalassiosira nordenskioeldii in winter, and S. costatum-ls, Asterionella glacialis in spring. In other words, the phytoplankton community showed high diversity in GCW throughout the year. According to the PCA, GCW were easily heated and cooled by radiant energy at lower depth, and the seasonal distributions of phytoplankton were determined by the supply of nutrients by re-fuelling of surface sediments due to the seawater mixing such as tidal mixing.

고창 연안해역의 해양환경 및 식물플랑크톤 군집의 시·공간적 변동 특성을 파악하기 위해 2016년 여름에서 2017년 봄까지 4계절 16개 정점을 조사하였다. 분석 결과, 수온은 표층에서 2.1℃에서 34.5℃의 범위로 큰 계절 변화를 보였지만, 염분은 표층에서 31.14 psu에서 32.64 psu의 범위로, 계절 변화가 크지 않아, 연안해역 수형은 수온에 지배되었다. Chl-a 역시 봄 최솟값 0.58 ㎍ L-1에서 여름 최댓값 10.5 ㎍L-1의 범위로 겨울에 높고, 가을과 봄에 낮았고, 큰 계절 변화를 보였다. 식물플랑크톤 군집은 53속 86종으로 단순하였다. 표층 현존량은 가을 최솟값 2.2 cells mL-1에서 여름 최댓값 689.2 cells mL-1의 변화 폭으로 여름에 높고, 가을에 낮았으나, 가을은 다른 계절보다 한 자릿수가 이상 낮았다. 우점종은 연중 규조류에 지배되어, 표층은 여름이 Leptocylindrus danicus, Chaetoceros curvisetus Skeletonema costatum-ls, 가을은 Paralia sulcata, Eucampia zodiacus, 겨울은 S. costatum-ls, Thalasiosira nordenskioeldii, 그리고 봄은 S. costatum-ls, Asterionella glacialis가 우점하였다. 즉 고창 연안해역의 식물플랑크톤 군집은 다양성이 높지만, 연중 특정 종에 크게 지배되는 군집구조를 나타내었다. 주성분 분석 결과 고창 연안해역은 낮은 수심으로 복사열에 의해 쉽게 가열 및 냉각되며, 조석혼합 등 해수 혼합 특성으로 표층퇴적물의 재부유에 의한 영양염 공급으로 식물플랑크톤 시·공간 분포가 결정되었다.

Keywords

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