Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Comparison of Spatio-temporal Variations of Phytoplankton Communities in Lakes in the Boseong River Basin

보성강 유역에 위치한 호수에서의 식물플랑크톤의 시공간적 군집 비교 분석

  • 조현진 (전남대학교 자연과학대학 생물학과) ;
  • 나정은 (전남대학교 자연과학대학 생물학과) ;
  • 이학영 (전남대학교 자연과학대학 생물학과)
  • Received : 2020.03.05
  • Accepted : 2020.03.17
  • Published : 2020.03.31
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Abstract

In this study, we compared the spatio-temporal differences of phytoplankton communities among 4 lakes in the Boseong River basin. Field research was conducted quarterly from 2014 to 2017 for this study. A total of 345 species of phytoplankton were identified including 107 Bacillariophyceae, 175 Chlorophyceae, 27 Cyanophyceae and 36 other phytoplankton taxa. Lake Boseong showed higher species numbers and density of phytoplankton than other lakes (Dunn's test, P<0.01). Bacillariophyceae such as Asterionella formosa, Aulacoseira granulata, Fragilaria crotonensis was dominated in most research periods, whereas Scenedesmus ecornis and Coelastrum cambricum belonging to Chlorophyceae were dominant species on August. The self-organizing map (SOM) classified 3 clusters with 10 × 7 grid and showed spatio-temporal variation of phytoplankton communities based on significant difference among each clusters. Total 31 species of phytoplankton were chosen as a indicator species using indicator species analysis(ISA) and reflected seasonal phytoplankton succession and diversity and density of phytoplankton according to nutrient concentration. Water temperature, Secchi depth, conductivity and DO were identified as important factors affecting the differences of phytoplankton communities in the studied lakes in Boseong River basin using non-metric multidimensional scaling (NMDS).

본 연구는 보성강 유역에 위치한 호수들에서 식물플랑크톤 군집의 시공간적 차이를 비교하고 이러한 군집 구조의 차이에 영향을 미치는 요인들을 확인하고자 2014년 3월부터 2017년 11월까지 분기별 조사를 시행하였다. 조사 결과, 보성호는 다른 호수들에 비해 식물플랑크톤의 다양성이 풍부하고 밀도 역시 높은 수준으로 확인되어 시공간적으로 큰 차이를 보였다. 또한 3월 조사에서 확인된 식물플랑크톤 군집은 다른 조사시기와 우점종을 포함한 규조류와 녹조류의 군집에서 구분되는 특성을 나타냈다. Indicator species analysis를 통해 확인된 각 그룹 간 지표종을 확인한 결과, 계절에 따른 식물플랑크톤 천이와 영양 농도에 따른 다양성 및 밀도 변화를 반영한 것으로 산출되어 호수들의 식물플랑크톤 군집이 시공간적으로 구분되었음을 나타냈다. Non-metric multidimensional scaling을 통해 보성강 유역 내 호수들의 식물플랑크톤 군집 구조에 있어 Secchi depth, 수온, 전기전도도, DO 등이 중요한 요인임을 확인하였고, 영양염을 포함한 다양한 환경요인과 함께 식물플랑크톤 군집 차이에 영향을 끼친 것으로 분석되었다.

Keywords

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