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Differences in Zooplankton Community Structure between Surface Water and Vertical Integrated Water in Middle and Down Stream of Nakdong River

낙동강 중⋅하류에서 표층 시료와 수직 예망 시료의 동물플랑크톤 군집 구조 차이 비교

  • Min-Seok Kim (Nakdong River Environment Research Center, National Institute of Environmental Research) ;
  • Hae-Kyung Park (Nakdong River Environment Research Center, National Institute of Environmental Research)
  • 김민석 (국립환경과학원 낙동강물환경연구소) ;
  • 박혜경 (국립환경과학원 낙동강물환경연구소)
  • Received : 2022.10.07
  • Accepted : 2023.05.02
  • Published : 2023.05.30

Abstract

Zooplankton are primary consumers in the food web connecting primary producers and predators such as small fish, playing an important role in energy transfer in aquatic ecosystems. Therefore, it is essential to understand the zooplankton community structure in material cycle and energy flow in aquatic ecosystems. Zooplankton in large rivers with a low flow rate would distribute vertically as in lakes. In this study, we collected zooplankton by surface water filtration and vertical haul method with 64 ㎛-mesh plankton net at three stations (ND-1, ND-2, ND-3) in Nakdong River fortnightly from June 2018 to December 2019. Species composition and individual densities were analyzed. All three stations showed differences in relative abundance of zooplankton groups between surface water and vertical integrated water, with the largest difference shown in the deepest station, ND-2. In vertically integrated water at ND-2, the relative abundance of rotifera was low by a maximum of 25% and that of cladocera was high by a maximum of 22% compared to surface water samples. These results indicate that surface water filtration method is not enough to represent the community structure of zooplankton compared to the vertical haul method in large rivers.

Keywords

Acknowledgement

본 논문은 환경부의 재원으로 국립환경과학원의 지원을 받아 수행하였습니다(NIER-2018-03-03-003). 시료 채취에 도움을 주신 낙동강물환경연구소 담수생태연구과 동료들에게 감사드립니다.

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