임진강 지류 신천의 어류군집 특성 및 수질이 하천 건강성에 미치는 영향 = Characteristics of Fish Community and the Effects of Water Quality on River Health in Sincheon, Imjin River, Korea

다국어 초록 (Multilingual Abstract)

This study investigated the characteristics of fish communities and river health in the Sincheon stream of Imgin River between April and October 2019. The survey collected 3,677 objects in 30 species belonging to 12 families from 23 survey stations. The dominant and subdominant species were Zacco platypus (28.4%) and Oryzias sinensis (13.6%), respectively, followed by Z. koreanus (11.8%), Rhynchocypris oxycephalus (11.7%), Carassius auratus (9.6%), and Pseudorasbora parva (7.9%) in that order. Among the fish species collected, 10 (33.3%) were endemic species in Korea. The exotic species were 5 (16.7%), including Micropterus salmoides, Lepomis macrochirus, Cyprinus carpio (Israeli type), Poecilia reticulata, and Xiphophorus maculatus. The land-locked species included Cottus koreanus and Rhinogobius brunneus, while C. koreanus was a climate change-sensitive species. The dominance of the fish community was low, and the diversity was high in the Sincheon mainstream, Sudongcheon and Cheongdamcheon, whereas Dongducheon and Sangpaecheon showed higher dominance and low diversity. The river health was very good and good in the uppermost and Sudongcheon areas, whereas the upper stream was normal, and the middle and lower streams were poor and very poor, respectively. The water quality was also mostly poor or very poor from the midstream to the downstream, and only Sudongcheon was very good. Therefore, the water quality had a great impact on fish habitat and eventually affected river health significantly. Although the water quality of Shincheon has improved each year, the introduction of several foreign species had a very negative effect. Improvement of river health in Shincheon requires water quality improvement and management of exotic fish species.

국문 초록 (Abstract)

신천의 어류 군집 특성과 하천의 건강성을 밝히기 위해 2019년 4월부터 10월까지 조사를 시행하였다. 조사기간동안 23개 지점에서 채집된 어류는 12과 30종 3,677개체였다. 우점종은 피라미(Zacco platypus, 28.4%), 아우점종은대륙송사리(Oryzias sinensis, 13.6%), 그 다음으로 참갈겨니(Zacco koreanus, 11.8%), 버들치(Rhynchocypris oxycephalus, 11.7%), 붕어(Carassius auratus, 9.6%), 참붕어(Pseudorasbora parva, 7.9%) 등의 순으로 우세하게출현하였다. 출현 종 중 한국고유종은 10종(33.3%)이었고, 외래종은 이스라엘잉어(Cyprinus carpio (Islaeli type), 떡붕어(Carassius cuvieri), 배스(Micropterus salmoides), 구피(Poecilia reticulata), 플래티(Xiphophorus maculatus) 5종(16.7%)이었으며, 육봉형 어류는 둑중개(Cottus koreanus)와 밀어(Rhinogobius brunneus) 2종(6.7%), 기후 변화민감종은 둑중개 1종(3.3%)이 출현하였다. 어류 군집분석 결과, 신천본류와 수동천, 청담천은 우점도는 낮고 다양도는높았으며, 동두천과 상패천은 우점도는 높고 다양도는 낮았다. 하천건강성은 최상류와 지류인 수동천이 매우 좋음, 좋음이었으나 상류부는 보통, 중·하류부는 나쁨, 매우 나쁨으로 나타났다. 수질도 중류부터 하류까지 대부분 나쁨또는 매우 나쁨이었고 지류 수동천만 매우 좋음이었다. 따라서 수질이 어류서식에 큰 영향을 미치면서 결국 하천건강성에 큰 영향을 주는 것으로 판단되었다. 연도별 신천의 수질은 점점 좋아지는 경향을 보였으며 외래종의 도입은 매우부정적인 요인이었다. 신천의 하천건강성을 향상시키기 위해서는 수질개선과 더불어 외래어종의 관리가 요구된다.

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