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Habitat Characteristics of Benthic Macroinvertebrates at a Headwater Stream in the Yeonyeopsan (Mt.)

연엽산 산지계류에 있어서 저서성 대형무척추동물의 서식특성

  • Jang, Su-Jin (Inst. of Forest Science, Kangwon National Univ.) ;
  • Nam, Sooyoun (Inst. of Forest Science, Kangwon National Univ.) ;
  • Kim, Suk-Woo (Div. of Forest Science, Kangwon National Univ.) ;
  • Koo, Hyo-Bin (Dept. of Forestry and Environmental Systems, Graduate school, Kangwon National Univ.) ;
  • Kim, Ji-Hyeon (Songlim Corp.) ;
  • Lee, Youn-Tae (Inst. of Forest Science, Kangwon National Univ.) ;
  • Chun, Kun-Woo (Div. of Forest Science, Kangwon National Univ.)
  • 장수진 (강원대학교 산림과학연구소) ;
  • 남수연 (강원대학교 산림과학연구소) ;
  • 김석우 (강원대학교 산림과학부) ;
  • 구효빈 (강원대학교 대학원 산림환경시스템학과) ;
  • 김지현 ((주)송림) ;
  • 이윤태 (강원대학교 산림과학연구소) ;
  • 전근우 (강원대학교 산림과학부)
  • Received : 2020.05.18
  • Accepted : 2020.07.27
  • Published : 2020.08.31

Abstract

A total of 24 families, 44 species, and 658 benthic macroinvertebrates were identified, and Ecdyonurus dracon Kluge (13%) was the dominant species in forested streams within the Yeonyeopsan (Mt.). A total of four habit categories (i.e., clingers (56%), burrowers (19%), swimmers (14%), and sprawlers (56%)) were identified, and clingers were the dominant habit at all survey points except point one (UP1). Habitat characteristics were depended on the hydraulic factors (e.g., flow velocity, depth, and substrates), water quality (e.g., DO and water temperature), and the habitat characteristics were differed in the riffle, which has a faster the flow velocity, compared by in the stagnant pool. In other words, in riffles, the clingers dominated in high flow velocity with the large maximum and median grain size for substrates in the habitats regardless of depth, but the burrowers and sprawlers were dominant in low flow velocity with the small maximum and median grain size for substrates in the habitats. Moreover, DO and flow velocity were in positive correlation (y = 0.6666x - 0.659, R2 = 0.0851), and the habitat for burrowers was wider than that for sprawlers or clingers. The water depth was negatively correlated with water temperature (y = -26.397x + 283.87, R2 = 0.1802) since the water temperature is more sensitive to insolation in shallow depth. pH was positively correlated with water temperature. The investigation of the habitat characteristics by separating the relations between pH and DO in upstream and downstream showed the low pH and high DO in the upstream with a high crown density of 68%, regardless of community composition. On the other hand, high pH and low DO in the downstream with a relatively low crown density of 51%. It was considered that the riparian forest played a role in suppressing the growth of attached algae and the controlling water temperature in headwater streams. Our findings identified the habitat characteristics of benthic macroinvertebrates in a headwater stream. We expected that the finding can provide reference data for suggesting conservation and management plans in a headwater stream and increasing academic value.

연엽산 산지계류의 저서성 대형무척추동물은 총 24과 44종 658개체가 확인되었으며, 참납작하루살이(Ecdyonurus dracon Kluge)가 13%로 우점하였다. 서식습성군으로는 붙는 무리(56%), 굴파는 무리(19%), 헤엄치는 무리(14%) 및 기는 무리(56%)의 총 4군집이 확인되었고, 1개소(UP1)를 제외한 모든 조사지점에서 붙는 무리가 우점한 것으로 나타났다. 그리고 서식특성은 서식처의 유속, 수심, 계상재료 등 수리학적 요인과 용존산소, 수온 등 수질 요인에 따라 달라지며, 유수가 정체하는 소(pool)보다는 유속이 빠른 여울(riffle, step-riffle)에서 그 차이가 나타났다. 즉, 여울에서는 수심과 관계없이 계상의 유속이 빠르고 계상재료의 중앙입경과 최대입경이 클수록 서식처에서 붙는 무리가, 유속이 느리고 계상재료의 중앙입경과 최대입경이 작은 서식처에서 굴파는 무리와 기는 무리가 우점하였다. 또한, 용존산소와 유속은 정의 상관관계(y = 0.6666x - 0.659, R2 = 0.0851)에 있으며, 굴파는 무리가 기는 무리와 붙는 무리보다 더 넓은 범위에 서식하는 것으로 나타났다. 수심이 얕을수록 일사량에 대한 수온의 민감도가 크기 때문에 수심과 수온은 부의 상관관계(y = -26.397x + 283.87, R2 = 0.1802)를 보였으며, pH와 수온은 정의 상관관계가 나타났다. 한편, pH와 용존산소의 관계를 상·하류로 구분하여 서식특성을 파악한 결과, 군집과 상관없이 울페도가 68%로 높았던 상류에서는 높은 용존산소값과 낮은 pH를, 울페도가 51%로 상대적으로 낮았던 하류에서는 낮은 용존산소값과 높은 pH가 나타나, 계안림에 의한 부착조류의 증식과 수온상승을 억제하는 역할을 한 것으로 판단된다. 이 연구는 산지계류에 있어서 저서성 대형무척추동물의 서식특성을 파악함으로써, 산지계류가 청정지역으로 인식되어 연구 대상으로서의 관심도가 낮았던 부분의 자료를 보완하였다. 따라서 향후 산지계류의 보호 및 관리 측면에서의 연구 방안 마련과 학술적인 가치를 높이기 위한 기초자료로 활용될 것으로 기대된다.

Keywords

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