Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
권호 표지

Change of Fish Fauna and Community Structure in the Naeseong Stream around the Planned Yeongju Dam

영주댐 예정지를 중심으로 한 내성천의 어류상과 군집구조의 변화

  • Kang, Yeong-Hoon (Department of Biology, Kyungpook National University) ;
  • Kim, Sang-Ki (Department of Biology, Kyungpook National University) ;
  • Hong, Gi-Bung (Department of Biology, Kyungpook National University) ;
  • Kim, Han-Sun (Department of Biology, Kyungpook National University)
  • Received : 2011.02.24
  • Accepted : 2011.06.14
  • Published : 2011.06.30
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Abstract

Ichthyological fauna and community structure were surveyed in the Naeseong Stream around the planed Yeongju Dam, Yeongju City, Gyeongsangbuk-do from April 2007 to October 2009, During the survey period, 27 species (25 genera, 10 families) were collected. Cyprinid fish comprised 63.0% (17 species) and cobitid fish comprised 7.4% (2 species). Ten of the 27 species (37.0%) were endemic species. The dominant and subdominant species based on the number of individuals was Zacco platypus (43.2%) and Zacco koreanus (15.8%), respectively. Introduced from the other native rivers and exotic fish were Opsariichthys uncirostris amurensis, Leiocassis ussuriensis, and Micropterus salmoides (11.1%). The declining population density of Zacco koreanus and its subdominant status represents a change, since, up until the mid 1990's, it was widely distributed throughout the area and was the dominant species. The distribution area of Zacco koreanus decreased in size; by 2009, it no longer inhabited the lower reaches of the Naeseong Stream. On the other hand, Zacco platypus remained the dominant species throughout the area, except for the upper-reaches of the water-course. Gobiobotia naktongensis inhabited all areas of Naeseong Stream, which mainly has a sandy bottom. Analyses of the fish community revealed species diversity, even-ness and dominant indices were 0.881, 0.615, and 0.230 respectively. These results showed that the main river, in which the water width and flow are abundant and which has various habitats, has a higher species diversity (0.829) than the tributary (0.735).

2007년 4월부터 2009년 10월까지 영주댐 예정지를 중심으로 내성천 수계의 어류상을 조사한 결과 서식이 확인된 어류는 10과 25속 27종이었다. 채집된 어류 가운데 잉어과 어류가 17종(63.0%)으로 가장 많았고,다음은 미꾸리과 어류가 2종(7.4%)이었다. 한국고유종은 5과 10종으로 전체 출현종의 37.0%를 차지하였으며, 출현종 중에서 우점종은 피라미(43.17%), 아우점종은 참갈겨니(15.75%)였다. 국내 다른 수계 또는 외래 이입종은 끄리, 대농갱이, 배스(상대풍부도 11.1%)였다. 1990년대 중반까지 참갈겨니는 전 유역에서 우점종으로 분포하고 있었으나 본 조사에서는 아우점종으로 개체군이 감소하였고, 하류역에서는 서식하지 않아 분포역이 축소되였다. 그에 반해 피라미는 최상류를 제외한 전유역에서 우점종으로 나타났다. 환경부 멸종위기종인 흰수마자는 하상이 주로 모래로 된 본류부의 전 유역에 서식하는 것으로 나타났다. 조사지역의 어류군집을 분석한 결과 종다양도, 균등도 및 우점도지수는 각각 0.881, 0.615 및 0.230으로 나타났다. 하폭 및 유수량이 많고 다양한 서식처를 가지는 본류부의 종다양도가 0.829로 0.735의 지류부보다 높게 나타났다.

Keywords

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