Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Study of Biomass Estimation Methods for the Freshwater Cladoceran Species, Simocephalus serrulatus (Koch, 1841)

담수산 지각류 Simocephalus serrulatus (Koch, 1841) 생체량 산정 방법 연구

  • Hye-Ji Oh (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Geun-Hyeok Hong (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Yerim Choi (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Kwang-Hyeon Chang (Department of Environmental Science and Engineering, Kyung Hee University)
  • 오혜지 (경희대학교 환경학및환경공학과) ;
  • 홍근혁 (경희대학교 환경학및환경공학과) ;
  • 최예림 (경희대학교 환경학및환경공학과) ;
  • 장광현 (경희대학교 환경학및환경공학과)
  • Received : 2023.06.20
  • Accepted : 2023.06.28
  • Published : 2023.06.30
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Abstract

The medium-large cladoceran species Simocephalus spp. predominantly occur in habitats with developed aquatic vegetation. Accordingly, due to Simocephalus' high contribution to zooplankton community biomass in the lake's littoral zone and wetland habitats, estimating their biomass is important to understand the matter cycling based on biological interactions within the aquatic food web. In this study, we reviewed the length-weight regression equations used previously to estimate Simocephalus biomass, directly measured S. serrulatus' body specification (length, width and area) and their biomass(dry weight) using instruments such as a microscopic digital camera and a microscale, and performed regression analysis between each other. When S. serrulatus biomass was estimated using the equation (Kawabata and Urabe, 1998) presented in 『Biomonitoring Survey and Assessment Manual』, Korea, errors between estimates and measures were relatively large compared to the S. serrulatus species-specific biomass estimate equation developed by Lemke and Benke (2003). In addition, both equations showed not only increasing trends in error (estimate-measure) with increasing S. serrulatus' body length, but also in error variance among similar-sized individuals. The results of regression analysis with dry weight by body specifications indicated that the most appropriate equation for estimating the biomass of S. serrulatus was derived from the width-dry weight exponential regression equation (R2=0.9555). The review and development study of such species-specific biomass estimation equations for zooplankton can be used as a tool to understand their role and function in aquatic ecosystem food webs.

Simocephalus spp.는 수생식물이 발달한 호소의 수변부 및 습지 서식처에서 우점 출현하는 중대형 지각류로, 해당 서식처의 동물플랑크톤 군집 생체량(biomass)에 기여하는 정도가 높아 먹이망 내 생물학적 상호작용을 기반으로 한 물질 순환을 이해하기 위해서는 Simocephalus종들의 생체량 산정이 중요하다. 본 연구에서는 S. serrulatus의 생체량 추정에 사용되어지고 있던 기존의 선행 산정식을 검토하고, 현미경 디지털 카메라와 미세 저울 같은 장비를 사용하여 개체의 다양한 체측값(체장, 너비 및 면적)과 생체량(건중량)을 직접 측정하여 상호 간 회귀 분석을 실시하였다. 국내 『생물측정망 조사 및 평가지침 - 보구간편』에서 제시하고 있는 Simocephalus spp.의 생체량 산정식(Kawabata and Urabe, 1998)을 사용하여 S. serrulatus 생체량을 추정했을 때, Lemke and Benke (2003)에 의해 개발된 S. serrulatus종 특이적 생체량 산정식 대비 추정치-실측치 간 오차가 상대적으로 크게 나타났으며, 두 산정식에서 모두 개체 체장 증가에 따른 오차 증가 및 유사 체장 개체 간 오차 편차 증가 경향이 보여졌다. 체측값별로 건중량과 회귀 분석을 실시한 결과, S. serrulatus 생체량 추정에 가장 적합한 산정식은 너비-건중량 지수 회귀식(R2=0.9555)으로 도출되었다. 이 같은 종 특이적 생체량 산정식의 검토 및 개발 연구는 수생태계 먹이망 내 동물플랑크톤 역할 및 기능 파악하는 데 도구(tool)로써 활용될 수 있다.

Keywords

Acknowledgement

이 논문은 2023년 정부(교육부)의 재원으로 한국연구재단 기초연구사업의 지원을 받아 수행된 연구임(No. 2021R1A6A3A13039786).

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