Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Characteristics of Fish Fauna and Community Structure in Ungcheon Stream due to the Environmental Changes

환경변화에 따른 웅천천의 어류상과 어류 군집 특성

  • 정화영 (국립수산과학원 중앙내수면연구소) ;
  • 김경환 (국립수산과학원 중앙내수면연구소) ;
  • 송미영 (국립수산과학원 중앙내수면연구소) ;
  • 이완옥 (국립수산과학원 중앙내수면연구소)
  • Received : 2014.04.02
  • Accepted : 2014.05.23
  • Published : 2014.06.30
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Abstract

We studied fish fauna at 10 study sites in Ungcheon stream for 4 times from April to October, 2011 to investigate the influence of artificial structures such as dam (with fish-way) and weir (without fish-way), and abandoned mine on fish community. A total of 12 families, 36 species of fishes were collected. Dominant species was Zacco platypus (23.4%) and subdominant species was Zacco koreanus (20.5%). Ten species (27.8%) of Korean endemic species and Micropterus salmoides, exotic species, were observed during the study period. Endangered species of Korea such as Pseudopungtungia nigra and Liobagrus obesus, and Korean endemic species, Coreoperca herzi, which are vulnurable for water quality and had been observed in previous study, were not identified in this study. According to the cluster analysis, Ungcheon stream were divided into three groups consisting upstream (St.1, St.2, St.3), midstream (St.4, St.5, St.6, St.7), downstream (St.8, St.9, St.10). Community structure similarity between upper and lower site of Boryeong dam with fish-way (St.6-St.7) was high, whereas that of weir, lack of fish-way (St.7-St.8) showed little similarity indicating that fish-way was required. According to the canonical correlation analysis, high level of conductivity and salinity at upstream was detected and Misgurnus mizolepis, and endemic species of Korea such as Silurus microdorsalis, Coreoleuciscus splendidus and Iksookimia koreensis were observed at this part of the stream. Since Korean endemic species, Squalidus gracilis majimae cohabit with exotic species, M. Salmoides at downstream whose width is wide and water velocity is low, protection was needed for these endemic species.

충남 보령시의 웅천천에 설치된 댐(어도 설치)과 대형 보(어도 미설치), 그리고 상류지역의 인근 폐광이 어류군집에 미치는 영향에 대해 알아보기 위하여 2011년 4월부터 10월까지 4회에 걸쳐 10개 지점의 어류상을 조사하였다. 총 12과 36종의 어류가 채집되었으며 우점종은 Zacco platypus(23.4%), 아우점종은 Zacco koreanus(20.5%) 였다. 고유종은 10종(27.8%)이었으며, 외래도입종인 Micropterus salmoides가 출현하였다. 유사도분석 결과 상류인 St.1, St.2, St.3, 중류인 St.4, St.5, St.6, St.7 하류인 St.8, St.9, St.10의 세 그룹으로 구분되었다. 어도가 설치된 보령댐의 상하류 지점간(St.6-St.7)의 군집유사도는 높았으나, 어도가 설치되지 않은 대형보의 상하류 지점간(St.7-St.8)의 유사도는 매우 낮아 어도의 설치가 필요하였다. 정준상관분석 결과, 웅천천의 환경조건은 일반적인 하천과는 달리 상류에서 전기전도도와 염도가 높게 나타났으며 이러한 환경에서 Misgurnus mizolepis 외에 고유종인 Silurus microdorsalis, Coreoleuciscus splendidus, Iksookimia koreensis 등이 서식하고 있었다. 하폭이 크고 유속이 느린 하류역에는 외래도입종인 M. salmoides 외에 고유종인 Squalidus gracilis majimae 이 동소적으로 출현하고 있어 이들을 위한 보호 대책이 필요하였다.

Keywords

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