제천시 농업용저수지의 어류상 및 생태건강성평가
Freshwater Fish Fauna and Ecological Health Assessment of the Agricultural Reservoirs in Jecheon City, Korea
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초록
2017년 5월부터 9월까지 제천시에 위치한 2개의 저수지인 의림지(Ur)와 솔방죽(Sr)을 대상으로어류상 조사 및 호수생태건강성평가를 실시하였다. 조사기간 동안 채집된 어류는 7과 16속 21종이 출현하였다. 그 중 잉어과 어류가 11종(52.4%), 318개체(46.2%)가 출현하여 우점하는 것으로 나타났고, 검정우럭과(2종, 264개체, 38.4%)가 아우점하는 것으로 나타났다. 전체 출현종 중 참몰개(RA 22.7%, 156개체) 가 우점종으로 나타났으며, 아우점종은 파랑볼우럭(19.5%, 134개체), 큰입배스(18.9%, 130개체)로 외래종이 차지하는 것으로 나타났다. 화학적산소요구량(COD), 총인(TP)과 엽록소-a(CHL)를 이용한 부영양화지수(TSIKO) 분석결과, 두 저수지는 중영양상태를 보이는 것으로 분석되었다. 두 저수지의 수환경영향평가를 위해 LEHA(Lentic Ecosystem Health Assessment) 다변수 모델을 적용하였고, 생태 건강도 모델 값을 산정하였다. 생태건강성평가 결과, 내성종이 각각 56.8%(Ur), 98.3%(Sr)로 나타났으며, 잡식종이43.9%(Ur), 65.6%(Sr)로 나타나 섭식구조의 단순화로 인하여 내성종과 잡식종의 우점현상을 보였으며, 특히 큰입배스의 상대풍부도가 16.3%(Ur), 31.1%(Sr)로 나타나 생태계가 교란되어 생태건강성이 크게 악화된 것으로 나타났다. 상기 LEHA 다변수 모델을 이용한 의림지(Ur)와 솔방죽(Sr)의 생태건강성 지수 값은 각각 22(의림지), 12(솔방죽)으로서 환경부(2014)의 등급에 의거하였을 때 “악화상태(의림지)”, “최악상태(솔방죽)”인 것으로 평가되었다.
Abstract
Fish fauna and lentic ecosystem health assessment in freshwater were analyzed in the two reservoirs (Uirim Reservoir (Ur) and Solbangjuk Reservoir (Sr)) of the Jecheon City during May- September 2017. Total numbers of the species and genus (7 family) sampled were 21 and 16, respectively. Cyprinidae was most dominant taxa, which accounted for 11 species (52.4%) of the total species, and the relative abundance, based on the number of individuals, was 318 individuals (46.2%). Subdominant families were taxa of Centrachidae (2 species; 264 ind. (38.4%). The dominant species, based on the relative abundance, were Squalidus chankaensis tsuchigae (22.7%). Subdominant species were Lepomis macrochirus (19.5%, 134 ind.) and Micropterus salmoides (18.9%, 134 ind.). Trophic state index of Korea (TSIKO), based on chemical oxygen demand (COD), total phosphorus (TP) and chlorophyll-a (CHL), ranged mesotrophic state. The purpose of this study was to apply a multi-metric model of Lentic Ecosystem Health Assessments (LEHA) for environmental impact assessments of two reservoirs and assessed the ecological health model values. Trophic composition’s metrics showed that tolerant species (56.8%, 98.3%) and omnivore species (43.9%, 65.6%) dominated the fish fauna in the two reservoirs (Ur and Sr) of Jecheon City, indicating a biological degradation in the aquatic ecosystem. The relative proportions of Micropterus salmoides, also showed greater than 16.3% (Ur), 31.1% (Sr) of the total, indicating a ecological disturbance. The average value of LEHA model was 22 (Ur) and 12 (Sr) in the reservoirs, indicating a “poor condition (Ur)” and “very poor condition (Sr)” by the criteria of MOE (2014).
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