Water Temperature and Community of Phytoplankton in Youngsan River, Korea

수온에 따른 영산강 식물플랑크톤군집 변동

  • Jeong, Eun-Jeong (Department of Biological Science, Chonnam National University) ;
  • Na, Jeong-Eun (Department of Biological Science, Chonnam National University) ;
  • Kim, Gyu-Man (Department of Biological Science, Chonnam National University) ;
  • Shim, Sung-Sun (Department of Biological Science, Chonnam National University) ;
  • Lee, Hak-Young (Department of Biological Science, Chonnam National University)
  • 정은정 (전남대학교 자연과학대학 생물학과) ;
  • 나정은 (전남대학교 자연과학대학 생물학과) ;
  • 김규만 (전남대학교 자연과학대학 생물학과) ;
  • 심성순 (전남대학교 자연과학대학 생물학과) ;
  • 이학영 (전남대학교 자연과학대학 생물학과)
  • Received : 2009.07.15
  • Accepted : 2010.03.20
  • Published : 2010.06.01

Abstract

In order to clarify the ecological properties of phytoplankton community, the distribution of phytoplankton and the relation of water temperature and size-fractionation measurements were studied from November 2004 to August 2005 in Youngsan River, Korea. A total of 265 phytoplankton species was identified. It consists of 48 genera and 123 species (46%) of Chlorophyceae, 27 genera and 89 species (34%) of Bacillariophyceae, 12 genera and 25 species (9%) of Cyanophyceae, respectively. From size fractionation analysis, nanophytoplankton (2~20 ${\mu}m$) dominated from early spring to early summer, and microphytoplankton (20~200 ${\mu}m$) from summer to winter. The relationship between chl-a and nanophytoplankton showed high correlation coefficient value ($r^2$=0.93) from Najudaegyo site. The correlation coefficient values between water temperature and nanophytoplankton were low except Dongkangdaegyo site which showed high value ($r^2$=0.73).

영산강의 7 조사지점에서 식물플랑크톤의 크기별 분포양상을 수온과 관련하여 상관성을 분석하였다. 조사대 상지역에서 1년간의 조사를 통해 동정된 식물플랑크톤은 녹조류가 48속의 123종(46%), 규조류가 27속의 89종(34%) 그리고 남조류가 12속의 25종(9%) 등으로 총 265종이었다. 식물플랑크톤의 크기별 구분은 Fenchel (1987)이 제시한 2~20 ${\mu}m$m의 미소식물플랑크톤, 20~200${\mu}m$의 소형식물플랑크톤, 200 이상의 중형식물플랑크톤으로 하여 각각의 크기그룹의 분포양상을 조사한 결과 클로로필 a의 농도는 미소식물플랑크톤의 개체수와 상관성이 높게 나타나 영산강의 식물플랑크톤으로 미소식물플랑크톤이 중요한 구성원임을 알 수 있었고, 수온과의 상관성 분석에서 모든 크기의 식물플랑크톤의 분포가 수온과 상관성이 낮은 것으로 나타났으나 미소식물플랑크톤은 상대적으로 더 높은 상관도를 보여주었다. 소형식물플랑크톤은 수온이 낮은 시기에 개체수가 많았으며 중형식물플랑크톤은 수온과 상관성이 거의 없는 것으로 나타났다.

Keywords

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