Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Fish Community Characteristics and the Effects of Water Quality on River Health in the Anyang Stream, Korea

안양천의 어류군집 특성 및 수질이 하천건강성에 미치는 영향

  • Received : 2024.02.06
  • Accepted : 2024.03.12
  • Published : 2024.04.30
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Abstract

This study conducted a survey two times at 20 points from April to June and from August to October 2022 to characterize the fish community and reveal the health of the Anyang stream. The survey collected 3,186 individuals belonging to 5 orders, 10 families and 34 species. The dominant species was Zacco platypus (43.4%), followed by Carassius auratus (10.1%), Cyprinus carpio (7.6%), Zacco koreanus (6.2%), Pungtungia herzi (5.2%), Oryzias sinensis (5.1%), Pseudorasbora parva (4.7%), Squalidus gracilis majimae (4.4%), Rhynchocypris oxycephalus (3.5%), Hemiculter eigenmanni (3.3%), Rhodeus ocellatus (1.4%), and Chelon haematocheilus (1.0%). Among the emerged species, 5 species (14.7%), including Rhodeus uyekii, Squalidus japonicus coreanus, and Odontobutis interrupta, were endemic to Korea, and 4 species (11.8%), including Cyprinus carpio (Israeli type), Lepomis macrochirus, Micropterus salmoides, and Poecilia reticulata, were exotic. The fish community analysis showed that the dominance was higher at the upper reaches of the Anyang stream and decreased downstream, and diversity, richness, and evenness were higher in tributary than mainstream. Stream health (fish assessment index, FAI) was generally poor, as it was rated as moderate (C) at seven sites, poor (D) at eight sites, and very poor (E) at five sites. Water quality was evaluated at eight sites, and it was rated as poor (V) at two sites, slightly poor (IV) at one site, moderate (III) at four sites, and slightly good (II) at one site, indicating that the overall water quality was poor and that the water quality had a significant impact on river health and fish habitat. Moreover, it was found that many weirs without fishways were constructed in the Anyang stream and became an obstacle to fish migration. Therefore, a systematic management plan to improve water quality and add fishways is necessary to improve the stream's health and conserve stable fish habitat.

안양천의 어류 군집 특성과 어류상에 대한 수질의 영향을 밝히기 위해 2022년 4~6월과 8~10월에 20개 지점을 2회 조사하였다. 조사 기간 동안 채집된 어류는 5목 10과 34종 3,186개체였다. 우점종은 피라미(Zacco platypus, 43.4%)였고, 아우점종은 붕어(Carassius auratus, 10.1%), 그 다음으로 잉어(Cyprinus carpio, 7.6%), 참갈겨니(Zacco koreanus, 6.2%), 돌고기(Pungtungia herzi, 5.2%), 대륙송사리(Oryzias sinensis, 5.1%), 참붕어(Pseudorasbora parva, 4.7%), 긴몰개(Squalidus gracilis majimae, 4.4%), 버들치(Rhynchocypris oxycephalus, 3.5%), 치리(Hemiculter eigenmanni, 3.3%), 흰줄납줄개(Rhodeus ocellatus, 1.4%), 가숭어(Chelon haematocheilus, 1.0%) 등의 순으로 우세하게 출현하였다. 출현종 중 한국고유종은 각시붕어(Rhodeus uyekii), 긴몰개, 몰개(Squalidus japonicus coreanus), 참갈겨니, 얼록동사리(Odontobutis interrupta) 5종(14.7%)이었고, 외래종은 이스라엘잉어(Cyprinus carpio Israeli type), 블루길(Lepomis macrochirus), 배스(Micropterus salmoides), 구피(Poecilia reticulata) 4종(11.8%)이었다. 어류 군집 분석 결과, 우점도는 상류가 높았고 하류로 가면서 낮아졌으며, 다양도와 풍부도, 균등도는 본류보다 지류에서 높게 나타나는 경향을 보였다. 하천건강성을 평가한 결과, 7개 지점에서 보통(C), 8개 지점에서 나쁨(D), 5개 지점에서 매우 나쁨(E)으로 평가되어 좋지 않았다. 수질은 8개 지점을 평가한 결과, 4개 지점은 보통(III), 2개 지점은 나쁨(V), 1개 지점은 약간 나쁨(IV), 1개 지점은 약간 좋음(II)으로 평가되어, 전체적인 수질은 나쁘게 나타났으며, 수질이 하천건강성과 어류의 서식에 큰 영향을 미치고 있는 것으로 추정되었다. 또한 안양천에 어도가 없는 보가 많이 설치되어 있어 어류의 이동에 장애물로 작용하고 있었다. 따라서 하천건강성을 높이고 안정적인 어류의 서식을 위해서는 수질을 개선할 수 있는 체계적인 관리방안이 필요하고 보에 어도 설치가 요구되었다.

Keywords

Acknowledgement

이 논문은 2022년도 국립생태원 제5차 전국자연환경조사의 연구비 지원(NIE-A-2024-01)으로 수행된 연구임

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