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A Charecteristics of Marine Environments in a Blood Cockle Farms of the Northwestern Yeoja Bay, Korea 2. Spatio-temporal Distribution of Water Quality and Phytoplankton Community

여자만 북서부 꼬막어장의 해양환경 특성. 2. 수질환경 및 식물플랑크톤 군집

  • Yoon, Yang Ho (Dept. of Ocean Covergence Science, Chonnam National University) ;
  • Lee, Hyun Ji (Dept. of Environmental Oceanography, Graduate School of Chonnam National University)
  • 윤양호 (전남대학교 해양융합과학과) ;
  • 이현지 (전남대학교 대학원 환경해양학과)
  • Received : 2020.05.11
  • Accepted : 2020.08.07
  • Published : 2020.08.31
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Abstract

This study was designed to assess the water quality and phytoplankton community including chlorophyll a in blood cockle (Tegillarca granosa) farms in May, August and November of 2017 in the northwestern Yeoja Bay, Korea. As a result, the seasonal characteristics of water types by water temperature and salinity were clear. Nutrients were abundant in silicate throughout the season, but phosphate was scarce in spring and summer, and nitrogen sources were scarce in autumn. The species composition of phytoplankton community was a very simple distribution, and the standing crop was also very low. The annual dominant species is dominated by the diatoms, with Skeletonema costatum-ls, Nitzschia longissima in spring, Pleurrosigma normanii, Coscinodiscus gigas in summer, and N. longissima, Pseudonitschia pungens, Chaetoceros curvisetus, Eucampia zodiacus in autumn. In summer the results were different from other coastal waters of Korea. The principal component analysis(PCA) and correlation analysis showed that the characteristics of water quality and biological environments differed according to the season. Furthermore, it was determined by the supply of materials through fresh water on land, seawater congestion caused by the refueling of surface sediments with lower depth, and the balance of biological production and mineralization of organic matters in blood cockle farms.

여자만 북서해역 꼬막 어장의 수괴(수형), 영양염 등 수질환경과 식물플랑크톤 군집의 변동 특성을 파악하기 위해 2017년 봄(5월), 여름(8월) 및 가을(11월) 7개 정점을 조사하였다. 분석 결과, 꼬막어장의 수형은 수온과 염분 변화에 따른 계절특성이 명확하였다. 영양염 중 규산염은 연중 풍부였지만, 봄과 여름은 인산염이 결핍되었고, 가을은 질소원이 결핍되는 것으로 나타났다. 식물플랑크톤 군집에서 출현종은 매우 단순하였으며, 현존량도 매우 낮았다. 우점종은 연중 규조류에 우점 되어, 봄은 Skeletonema costatum-ls, Nitzschia longissima, 여름은 Pleurosigma normanii, Coscinodiscus gigas, 가을은 N. longissima, Pseudonitzschia pungens, Chaetoceros curvisetus, Eucampia zodiacus가 우점 출현하여, 여름에 편모조류 출현이 낮은 특성을 보였다. 상관분석과 주성분 분석의 결과 여자만 북서해역 꼬막어장의 생물 해양학 특성은 계절에 따라 수질 환경 및 식물플랑크톤 군집에 많은 차이가 있으나, 전체적으로는 육상에서 공급되는 무기 및 유기물질 및 낮은 수심으로 해수혼합에 따른 표층퇴적물의 재부유에 의한 영양염 공급, 그리고 해역자체의 생물생산과 무기화 과정의 균형에 의해 해양환경 특성 및 식물플랑크톤 생산이 결정되는 것으로 판단되었다.

Keywords

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