Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Changes of Dominant Phytoplankton Community in Downstream of the Nakdong River: From 2002 to 2012

낙동강 하류지역의 식물플랑크톤 우점종 군집 변화: 2002년~2012년

  • 손희종 (부산광역시 상수도사업본부 수질연구소)
  • Received : 2013.03.27
  • Accepted : 2013.04.22
  • Published : 2013.04.30
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Abstract

The changes of phytoplankton community in downstream of the Nakdong River from 2002 to 2012 was investigated. Phytoplankton biomass (chlorophyll-a concentration) was gradually increased, but dominant species cell number was gradually decreased. In changes of percentage of dominant species cell number from 2002 to 2012, Diatoms was gradually decreased, but blue-green algae was gradually increased. In changes of annual percentage of dominant period, Diatoms showed high percentage from November to May, and dominant period (%) of diatoms was 56%~74% from June to September, also dominant period of diatoms was about 300 days every year. Percentage of dominant species cell number and dominant period of blue-green algae was 68%~94% and 26%~ 36% from June to September, respectively. And green-algae showed low percentage from April to September. In the transition patterns of diatoms and blue-green algae, Stephanodiscus spp. was the highest dominant species, from December to May, and Aulacoseira spp. and Fragilaria spp. were showed high dominant percentage from May to October. In the case of blue-green algae, Microcystis spp. was the highest dominant species, from May to November, also in the case of green algae, Actinastrum spp., Pediastrum spp., Micractinium spp. and Pandorina spp. were dominant species from April to September.

2002년부터 2012년까지 낙동강 하류 물금지역에서의 식물플랑크톤 우점종의 군집비율 변화를 조사한 결과, 식물플랑크톤 생체량(클로로필-a 농도)은 점진적인 감소 추세였던 반면, 우점종의 개체수는 증가 추세를 나타내었다. 식물플랑크톤 종별로 우점종의 연도별 개체수 비율변화에서 규조류는 감소 추세를 보인 반면, 남조류는 증가 추세를 나타내었다. 또한, 우점기간의 경우 매년 우점기간의 75% 이상을 규조류가 차지하였다. 연중 식물플랑크톤 비율변화에서 규조류는 11월에서 5월까지 매우 높은 우점비율을 보였고, 6월부터 9월까지도 우점일수의 56%~74%를 차지하여 연중 규조류가 300일 정도 우점하였다. 남조류는 6월부터 9월까지 개체수 및 우점기간의 68%~94% 및 26%~36%를 차지하였으며, 녹조류는 4월부터 9월까지 낮은 우점률을 나타내었다. 규조류와 남조류 우점종들의 연중 천이패턴은 규조류의 경우 12월~5월은 Stephanodiscus spp., 5월~10월은 Aulacoseira spp.와 Fragilaria spp.가 대부분 우점하였으며, 남조류의 경우 5월~11월에 Microcystis spp.가 대부분을 우점하였다. 또한, 녹조류는 4월~9월에 Actinastrum spp., Pediastrum spp., Micractinium spp. 및 Pandorina spp.가 우점하였다.

Keywords

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