Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Influences of Nutrient Deficiency on the Phytoplankton Community in Pal'tang Reservoir

몇가지 영양염 결핍이 팔당댐의 식물플랑크톤군집에 미치는 영향

  • 김백호 (한양대학교 생명과학과) ;
  • 최지영 (한양대학교 생명과학과) ;
  • 황순진 (건국대학교 지역건설환경공학과) ;
  • 한명수 (한양대학교 생명과학과)
  • Published : 2004.03.31
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Abstract

To understand the effect of nutrient deficiency on the plankton community in three stations with different water qualities in Pal'tang Reservoir, Korea, phytoplanktons(> 10 ${\mu}m$) were cultured in nutrient enrichment Allen's media (AM) and nutrient-deficient Allen's media. A distinct shift in the species composition and biomass of phytoplankton (as chlorophyll- a) showed in all treatments. In particular, it was very interesting that the new development of cyanobacterium Microcystis aeruginosa occurred by the Fe-deficient AM. Except for Si, a community growth (as chlorophyll- a) was inhibited in all nutrient deficient treatments. Species diversity after nutrient deficiency was changed to below 2.0; slightly increased in N and P-deficiency, while decreased in Si and Fe, respectively. As suggested, dominance was entirely opposite to diversity. Therefore, the nutrient deficient effectively induced the succession of species and biomass, phytoplankton community, suggesting a possibility as a reliable tool to control the algal bloom in eutrophic lakes and reservoirs.

영양염 (N, P, Si, Fe) 결핍이 팔당호내 서로 다른 3개지점의 식물플랑크톤 군집(>10 ${\mu}m$)에 어떠한 영향을 미치는지 파악하기 위하여 채수한 현장수를 결핍배지에서 일정시간 배양한 후 대조군과 비교 조사하였다. 조사결과, 현장수는 공히 영양물질과 현장수 증류에 따라 서로 다른 종 천이 및 생물량을 나타냈다. 영양염 결핍에 따른 천이는 N, P, Si 결핍군에서는 속(genus)수준에서, Fe결핍에서는 종(species) 수준에서 일어났다. 특히 Fe결핍에서 남조 Microcystis aeruginosa, N 결핍에서 Anabaena의 발달은 매우 흥미로운 결과이다. 또한 모든 결핍군에서 뚜렷한 성장저해 현상을 보였으나 Si 결핍군에서는 생물량 변동이 거의 없었다. 식물플랑크톤 군집은 영양염결핍과 채수지점에 따라 차이를 보였는데, 전체적으로 N,P 결핍군에서는 우점도 감소 및 다양도 증가를 보였으며,Si,Fe 결핍군과는 반대 결과를 보였다. 따라서 영양염 결핍은 조사지점에 따라 다소 차이를 보였으나 식물플랑크톤 종 천이, 생물량 변동 등의 뚜렷한 군집변화를 유도함으로서 수계내 문제조류의 근본적 해결의 가능성을 시사해 주었다.

Keywords

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