Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Comparison of the habitat distribution characteristics of Aquatic Oligochaeta according to the construction of weirs in four major rivers in South Korea

4대강 보 건설에 따른 실지렁이류(Aquatic Oligochaeta) 서식분포 특성 비교

  • Wang, Ju Hyoun (Department of Environmental Engineering, College of Science & Engineering, Sangji University) ;
  • Park, Hyung Joon (Department of Biological Science, College of Science & Engineering, Sangji University) ;
  • Park, Jung Ho (Institute of K-ECO) ;
  • Song, Haeng Seop (Institute of K-ECO) ;
  • Kim, Ho Joon (Korea Institute of Water and Environment) ;
  • Park, Yeon Jeong (Korea Institute of Water and Environment) ;
  • Choi, Jun Kil (Department of Biological Science, College of Science & Engineering, Sangji University) ;
  • Lee, Hwang Goo (Department of Biological Science, College of Science & Engineering, Sangji University)
  • Received : 2019.08.30
  • Accepted : 2019.11.28
  • Published : 2019.12.31
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Abstract

This study examined the habitat distribution characteristics of Aquatic Oligochaeta according to the construction of weirs in the four major rivers in South Korea. The area was investigated 10 times from March to October in 2018 and a total of 18 species and 35,390 ind. m-2 were sampled. The dominant species by number was Limnodrilus hoffmeisteri(77.1%) and the subdominant species was Branchiura sowerbyi(9.5%). A total of 32.418 g m-2 dry weight was analyzed. The correlation analysis showed that the number of Aquatic Oligochaeta individuals correlated with the sediment depth, clay ratio, silt ratio, sand ratio, cobble ratio, pebble ratio, pH and TOC mg L-1. Specifically, the clay ratio and sediment depth were associated with increases in the number of individuals. The total organic carbon(TOC) increased from March to October and, conversely, the number of individuals tended to decrease.

본 연구는 4대강 보 설치에 따른 실지렁이류의 분포 특성을 파악하고자 연구를 실시하였다. 현지조사는 2018년 3월부터 10월까지 총 10회 실시하였다. 조사결과 총 18종 35,390 ind. m-2 개체가 출현하였다. Limnodrilus hoffmeisteri (77.1%)이 우점종, Branchiura sowerbyi (9.5%)이 아우점종으로 분석되었다. 건중량 분석결과 총 32.418 g m-2이 계측되었으며, 각 종별 건중량과 TOC 농도와의 상관 분석 결과 실지렁이, 아가미지렁이와 TOC 농도 간 음의 상관성을 갖는 것으로 나타났다. 실지렁이류와 물리적·이화학적 요인들 간의 다변량 상관분석 결과 퇴적토 깊이, Clay 비율, Silt 비율, Cobble 비율, Pebble 비율, pH, TOC 항목과 상관성을 갖는 것으로 분석되었다(p<0.05, p<0.01). 조사지역별 실지렁이류 개체수와 퇴적토 깊이 및 Clay의 비율과 비교·분석한 결과 퇴적토의 깊이와 Clay의 비율이 높을수록 개체수가 많은 것으로 나타났다. 조사시기에 따른 실지렁이류의 개체수, TOC 비교·분석결과 3월부터 10월까지 개체수는 감소하는 경향성을 나타냈으며, TOC는 증가하는 경향성을 갖는 것으로 분석되었다.

Keywords

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