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보령댐 도수가 저서성 대형무척추동물 군집구조 변화에 미치는 영향

The Effect of Water Conveyance of Boryeong Dam on Structural Changes of Benthic Macroinvertebrates Community

  • An, Chae-Hui (Department of Biological Science, Sangji University) ;
  • Han, Jung-Soo (Department of Biological Science, Sangji University) ;
  • Choi, Jun-Kil (Department of Biological Science, Sangji University) ;
  • Lee, Hwang-Goo (Department of Biological Science, Sangji University)
  • 투고 : 2018.03.14
  • 심사 : 2018.08.14
  • 발행 : 2018.08.31

초록

본 연구는 충청남도 보령시에 위치한 보령댐의 도수 전과 후의 저서성 대형무척추동물상을 비교 분석하여 인위적 교란에 대한 영향을 파악하고자 하였다. 조사시기는 2016년 4월부터 2017년 9월까지 총 8회에 걸쳐 조사하였으며, 조사지점은 방류되는 지점부터 총 4개의 지점을 선정하였다. 저서성 대형무척추동물은 총 4문 7강 19목 70과 125종 13,447개체가 출현하였다. 군집분석 결과 우점도 0.55(${\pm}0.07$)에서 0.47(${\pm}0.08$), 다양도 2.06(${\pm}0.26$)에서 2.23(${\pm}0.28$), 균등도 0.69(${\pm}0.05$)에서 0.70(${\pm}0.04$), 풍부도 3.43(${\pm}0.72$)에서 4.03(${\pm}0.91$)으로 나타났다. 도수 이후 우점도는 감소하고 다양도, 균등도, 풍부도는 증가하는 안정적인 군집구조로 나타났다. 기능군 분석 결과 도수 이후 섭식기능군은 긁어먹는 무리, 걸러먹는무리의 비율은 증가하고 썰어먹는무리, 주워먹는무리의 비율은 감소하였으며, 서식기능군은 기어오르는 무리와 붙는무리의 비율은 증가하고 굴파는무리와 기는무리의 비율은 감소하는 것으로 나타났다. 군집안정성 분석결과 도수 이후 St. 1과 St. 2는 저항력과 회복력이 감소하여 III 특성군에 새로운 종이 출현하였으며, St. 3과 St. 4는 큰 차이를 나타내지 않았다. 다차원척도법 분석 결과 도수 이후 St. 1에서 유사도의 변화가 가장 높은 것으로 나타났으며, St. 4에서 유사도의 변화가 가장 낮은 것으로 나타났다.

The purpose of this study is to investigate the influence of artificial disturbances occurring during water conveyance frequency on benthic macro-invertebrate by comparing and analyzing data before and after the construction of Boryeong dam in Boryeong-si, Chungcheongnam-do. We conducted the survey eight times in four points from April 2016 to September 2017. A total of 13,447 individuals from 125 species, 70 families, 19 orders, 7 classes, and 4 phyla were collected. The result of the community analysis showed that the dominant index was 0.55 (${\pm}0.07$) to 0.47 (${\pm}0.08$), diversity index was 2.06 (${\pm}0.26$) to 2.23 (${\pm}0.28$), evenness index was 0.69 (${\pm}0.05$) to 0.70 (${\pm}0.04$), and richness index was 3.43 (${\pm}0.72$) to 4.03 (${\pm}0.91$). After conveyance, the dominance decreased while the diversity, evenness, and richness increased. The result of the functional group analysis showed the portion of scrapers, filtering-collectors increased while that of shredders, gathering-collectors decreased in the functional feeding group and that the proportion of climbers and clingers increased while that of burrowers and sprawlers decreased in the habitat orientation group. The result of analysis of community stability showed that St. 1 and St. 2 decreased resistance and resilience after conveyance and new species appeared in the III characteristics group while St. 3 and St. 4 did not show much difference. The result of multidimensional scaling analysis showed that the variation of similarity was the highest at St. 1 after conveyance, and the variation of similarity at St. 4 was the lowest.

키워드

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