Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Long Term Variations and Environment Factors of Zooplankton Community in Lake Soyang

소양호 동물플랑크톤 군집의 장기변동과 환경요인: 2003~2014

  • Kim, Moon Sook (Department of Environmental Science, Kangwon National University) ;
  • Kim, Bomchul (Department of Environmental Science, Kangwon National University) ;
  • Jun, Man-Sig (Research Institute for Gangwon)
  • Received : 2018.01.05
  • Accepted : 2018.03.13
  • Published : 2018.03.31
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Abstract

Long-term variation of zooplankton community and species composition was studied from 2003 to 2014 in a deep reservoir, Lake Soyang, in monsoon climate region, Korea. In addition, we examined the correlation with environmental factors. Annual precipitation of watershed showed a large variation in the $705{\sim}1,779mm\;yr^{-1}$ and more than 70% of it was being concentrated from June to September. The water quality of Lake Soyang was shown a clearly seasonal variations and particularly turbid water flowing into the lake during rainy season was the most important environmental factors. Zooplankton community in Lake Soyang showed a significant difference before and after 2006. Zooplankton biomass has shown a large increase and also showed a change in the zooplankton community structure since 2006. The of zooplankton showed positive correlation with temperature and BOD, Chl. a, TP concentration. These results are considered that nutrient and organic matter contained in the turbid water influences the increase in zooplankton biomass and species composition. However, water quality was limited to account for the increase in biomass of zooplankton. For example, increase of small zooplankton density (rotifer; Keratella cochlearis, Polyarthra vulgaris) in spring which is dominated by diatoms (large size; Melosira, Synedra etc.) is considered as a bottom-up effect by the microbial loop. And increased density of crustaceans in autumn was considered a top-down effects by the relationship between predator and prey of microzooplankton and mesozooplankton. In other words the inflow of allochthonous organic matter during rainy season also affected to zooplankton food web in Lake Soyang. In conclusion, biomass, diversity and long-term variations of zooplankton in Lake Soyang were determined by physico-chemical factors but also it is considered that biological interactions is important.

본 연구의 목적은 소양호 동물플랑크톤 군집의 장기적인 변동을 관찰하고 환경요인에 따른 영향을 알아보고자 하였다. 조사기간 동안 소양호 유역 강수량은 $705{\sim}1,779mm\;yr^{-1}$의 큰 변동을 보였으며, 이로 인한 호소의 수위변동과 함께 여름철 많은 양의 탁수가 유입되는 것으로 나타났다. 소양호 수질은 몬순기후로 인한 여름철 홍수기 탁수유입이 가장 중요한 환경요인으로 작용하였으며, 계절적 변화가 뚜렷하게 나타났다. 장기간 동안 소양호 동물플랑크톤 군집의 현존량은 2006년을 기준으로 이전과 이후로 뚜렷한 차이를 보였으며, 강우 이후 동물플랑크톤의 현존량이 급격히 증가하는 것으로 나타났다. 소양호에서 동물플랑크톤은 1차적으로 이화학적 환경요인과 양의 상관성을 보였으며, 강우 시 유입된 높은 농도의 인과 유기물 증가가 동물플랑크톤 성장에 영향을 미친 것으로 판단되었다. 그러나 소양호에서 동물플랑크톤 군집의 변동은 이화학적 환경요인으로만 설명하는 데는 한계가 있었으며, 동물플랑크톤의 생물량 증가를 먹이망 내에서 top-down과 bottom-up 효과로 설명할 수 있었다. 결과적으로 소양호 동물플랑크톤의 생물량과 군집구조는 탁수유입에 따른 영양염과 유기물 공급, 식물플랑크톤 현존량 및 종 조성 그리고 동물플랑크톤 상호작용이 주요한 결정요인으로 작용한 것으로 판단되었다.

Keywords

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