한국환경생태학회지 (Korean Journal of Environment and Ecology)

  • 제32권3호
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  • Pages.274-288
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  • 2018
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  • 1229-3857(pISSN)
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  • 2288-131X(eISSN)
한국환경생태학회 (Korean Society of Environment and Ecology)
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낙동강 신규조성 습지의 어류 분포와 종다양성 증진을 위한 관리방안

Fish Distribution and Management Strategy for Improve Biodiversity in Created Wetlands Located at Nakdong River Basin

  • 최종윤 (국립생태원 생태평가연구실) ;
  • 김성기 (국립생태원 생태평가연구실) ;
  • 박정수 (국립생태원 생태평가연구실) ;
  • 김정철 (국립생태원 생태평가연구실) ;
  • 윤종학 (국립생태원 생태평가연구실)
  • Choi, Jong Yun (Division of Ecological Assessment, National Institute of Ecology) ;
  • Kim, Seong-Ki (Division of Ecological Assessment, National Institute of Ecology) ;
  • Park, Jung-Soo (Division of Ecological Assessment, National Institute of Ecology) ;
  • Kim, Jeong-Cheol (Division of Ecological Assessment, National Institute of Ecology) ;
  • Yoon, Jong-Hak (Division of Ecological Assessment, National Institute of Ecology)
  • 투고 : 2018.04.02
  • 심사 : 2018.06.14
  • 발행 : 2018.06.30
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초록

낙동강 유역에 조성된 신규습지에서 서식환경에 대한 어류의 분포 특성을 평가하고, 이를 기반으로 한 관리방안 도출을 위해 42개 습지에서 환경요인의 측정과 어류 조사를 시행하였다. 조사 기간 동안 총 30종의 어류가 출현하였으며, 이 중에서 배스(Micropterus salmoides)와 블루길(Lepomis macrochirus)과 같은 외래어종의 비율이 상대적으로 높았다. 특히, 밀어(Rhinogobius brunneus)나 끄리(Opsariichthys uncirostris amurensis), 피라미(Zacco platypus) 등의 어류는 흐름이 있는 환경을 선호하기 때문에 배스가 우점하는 습지(정체수역)에서 상대적으로 낮은 밀도를 가지는 것으로 사료된다. SOM (Self-Organizing Map)을 활용한 패턴분석 결과, 각 습지의 서식환경 특성에 따라 어류 종의 출현빈도가 상이한 것으로 분석되었다. 어류 종의 분포는 각 습지의 수심 변화와 수생식물 피도에 민감하게 영향 받는 것으로 나타났으며, 수온이나 pH, 용존산소 등의 이화학적 요인 변화에 대한 영향은 적었다. 특히 수생식물의 피도는 어류의 종다양성이나 밀도에 강한 영향을 주는 것으로 분석되었으며, 수변식생이 부족한 습지에서는 어류가 적은 풍부도와 다양성을 가지는 것으로 나타났다. 본 연구 결과를 기반으로 평가할 때 어류 등의 생물다양성 증진을 위해 호안사면의 높은 인공성이나 수변식생의 부족한 습지 등은 개선이 필요할 것으로 사료되며, 건강성 확보를 위한 지속가능한 관리방안이 마련되어야 할 것으로 판단된다.

This study investigated the environmental factors and fish assemblage in 42 wetlands between spring and autumn of 2017 to evaluate the fish distribution and deduce the management strategy for improving biodiversity in created wetlands located at the Nakdong River basin. The investigation identified a total of 30 fish species and found that the most of wetlands were dominated by exotic fishes such as Micropterus salmoides and Lepomis macrochirus. Fish species such as Rhinogobius brunneus, Opsariichthys uncirostris amurensis, Zacco platypus were less abundant in the area with high density of Micropterus salmoides (static area) because they preferred the environment with active water flow. The pattern analysis of fish distribution in each wetland using the self-organizing map (SOM) showed a total of 24 variables (14 fish species and 10 environmental variables). The comparison of variables indicated that the distribution of fish species varied according to water depth and plant cover rate and was less affected by water temperature, pH, and dissolved oxygen. The plant cover rate was strongly associated with high fish density and species diversity. However, wetlands with low plant biomass had diversity and density of fish species. The results showed that the microhabitat structure, created by macrophytes, was an important factor in determining the diversity and abundance of fish communities because the different species compositions of macrophytes supported diverse fish species in these habitats. Based on the results of this study, we conclude that macrophytes are the key components of lentic freshwater ecosystem heterogeneity, and the inclusion of diverse plant species in wetland construction or restoration schemes will result in ecologically healthy food webs.

키워드

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