Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Ichthyofauna and Fish Community Structure in the Hoecheon Stream and Some Adjacent Tributaries of the Nakdonggang River, Korea

회천 및 인접 소하천들의 어류상과 군집 구조

  • Received : 2017.09.07
  • Accepted : 2017.09.22
  • Published : 2017.09.30
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Abstract

Fauna of freshwater fish and community structure were investigated at 24 stations in the Hoecheon Stream and some adjacent tributaries of the Nakdonggang River, Korea from July 2016 to August 2017. During the period 42 species and 4 types belonging to 32 genera and 11 families were collected. In this collection fishes of Cyprinidae were 24 species and 4 types, most numerous possessing 59.1% of all. There were 16 Korean endemic species including Acheilognathus yamatsutae and Odontobutis platycephala, 3 endangered species such as Pseudobagrus brevicorpus and Koreocobitis naktongensis (rank I) and Culter brevicauda (rank II) and 2 exotic species such as Micropterus salmoides and Lepomis macrochirus. Fish species transferred from other native rivers were 4 species including Opsariichthys uncirostris amurensis, Hemiculter eigenmanni, Odontobutis interrupta and Tridentiger brevispinis. Dominant species was Zacco koreanus NS type (19.2%) and sub-dominant species was Z. platypus R type (16.1%). The structure of fish community in the Hoecheon Stream was very stable and diverse in having diversity 2.91, evenness 0.77, dominance 0.35 and species richness 4.67. Fish community was divided into 4 groups such as upper, middle, midlower and lower reach group based on similarity among surveyed stations.

2016년 7월부터 2017년 8월까지 낙동강수계의 1차 지류인 회천과 인접한 소하천들에서 24개 지점의 어류상을 조사하였다. 그 결과, 모두 11과 32속 42종 4형의 어류가 확인되었다. 그중 잉어과 어류가 24종 4형(59.1%)으로 가장 많았다. 한반도 고유종은 A. yamatsutae와 Odontobutis platycephala 등의 16종이었다. 멸종위기야생생물에 해당하는 종은 I급에 Pseudobagrus brevicorpus와 Koreocobitis naktongensis, II급에 Culter brevicauda로 3종이 출현하였다. 외래종은 Lepomis macrochirus와 Micropterus salmoides의 두 종이 있었으며, 국내이입종은 Opsariichthys uncirostris amurensis, Hemiculter eigenmanni, O. interrupta, Tridentiger brevispinis의 4종이 확인되었다. 우점종은 Zacco koreanus NS (19.16%), 아우점종은 Zacco platypus R(17.17%)이었다. 회천과 인접 하천 수계 전체에서는 다양도 2.894, 균등도 0.765, 우점도 0.353, 종풍부도 4.668로 나타나 다양하고 안정된 어류군집을 이루고 있었다. 어류군집 간의 유사도를 바탕으로 작성한 수지도에서는 상류집단, 중류집단, 중하류집단, 하류집단의 4집단으로 구분되었다.

Keywords

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