Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Fish Community Characteristics and Distribution Aspect of Rhodeus pseudosericeus(Cyprinidae) in the Geumdangcheon(Stream), a Tributary of the Hangang Drainage System of Korea

한강 지류 금당천의 어류군집 특징과 멸종위기종 한강납줄개의 서식양상

  • Received : 2023.02.28
  • Accepted : 2023.03.31
  • Published : 2023.04.30
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Abstract

This study investigated the characteristics of fish communities and inhabiting status of the endangered species, Rhodeus pseudosericeus, in the Geumdang Stream in Korea from March to October 2021. A total of 1,698 fish in 5 families and 25 species were collected from 7 survey stations during the survey period. The dominant species was Zacco platypus (relative abundance, 46.5%), and the subdominant species was Squalidus gracilis majimae (16.7%), followed by Rhynchocypris oxycephalus (12.0%), Z. koreanus (5.7%), Pungtungia herzi (3.2%), R. pseudosericeus (2.0%), R. notatus (1.9%), and Acheilognathus rhombeus (1.8%). Nine Korean endemic species (36.0%) were collected, including R. pseudosericeus, R. uyekii, Sarcocheilichthys variegatus wakiyae, Microphysogobio yaluensis, S. gracilis majimae, Z. koreanus, Cobitis nalbanti, Iksookimia koreensis, and Odontobutis interrupta. An exotic species, Micropterus salmoides, designated as an invasive alien species (IAS), was collected downstream. The investigation of the habitat patterns of the endangered species (class II), Rhodeus pseudosericeus, showed a habitat range of about 6 to 7 km in the middle of Geumdang Stream (RP-1 to RP-4), and this species inhabited the edge with water depths of 0.3 through 1.0 m with slow water flow and many aquatic plants. According to the community analysis results, the overall dominance and evenness indexes were low, while diversity and richness indexes were high, and the cluster structure was largely divided into upstream and middle-downstream areas. The river health (fish assessment index) evaluated using fish was assessed as good (3 stations), normal (3 stations), and bad (1 station), and water quality was evaluated as good both upstream and downstream. Compared to previous studies, the number of species was relatively similar, and among the species that appeared in the past, 13 species did not appear in this survey, while 6 species appeared for the first time in this survey. Disturbance factors included river construction, many weirs, and the appearance of the ecosystem-disturbing species, M. salmoides. Since Geumdang Strem has high conservation value because it is home to many species in the Acheilognathinae subfamily, including the endangered species R. pseudosericeus, continuous attention and systematic conservation measures are required.

금당천의 어류군집 특징과 멸종위기종 한강납줄개(Rhodeus pseudosericeus)의 서식양상을 파악하기 위해 2021년 3월부터 10월까지 조사를 실시하였다. 조사기간 동안 7개 지점에서 5과 25종 1,698개체의 어류가 채집되었다. 우점종은 피라미(Zacco platypus, 상대풍부도 46.5%), 아우점종은 긴몰개(Squalidus gracilis majimae, 16.7%) 였으며, 그 외 버들치(Rhynchocypris oxycephalus, 12.0%), 참갈겨니(Z. koreanus, 5.7%), 돌고기(Pungtungia herzi, 3.2%), 한강납줄개(2.0%), 떡납줄갱이(R. notatus, 1.9%), 납지리(Acheilognathus rhombeus, 1.8%) 등의 순으로 우세하였다. 출현종중 한국고유종은 돌마자(Microphysogobio yaluensis), 한강납줄개, 각시붕어(R. uyekii), 참중고기(Sarcocheilichthys variegatus wakiyae), 긴몰개, 참갈겨니, 점줄종개(Cobitis nalbanti), 참종개(Iksookimia koreensis), 얼록동사리(Odontobutis interrupta) 9종(고유화율 36.0%)이었고, 외래종은 생태계교란 생물로 지정된 배스(Micropterus salmoides) 1종이 하류부에서 채집되었다. 법정보호종으로 환경부지정 멸종위기 야생생물 II급인 한강납줄개의 서식양상을 조사한 결과, 서식범위는 금당천 중류부(RP-1~RP-4) 약 6~7km 구간이며, 주로 수심 0.3~1.0m의 유속이 느리고 수생식물이 많은 소의 수변부에 서식하고 있었다. 어류군집 분석 결과, 전체적으로 우점도와 균등도가 낮고 다양도와 풍부도는 높게 나타났으며, 군집구조는 크게 상류와 중하류로 구분되었다. 하천 건강성은 좋음(3지점)과 보통(3지점), 나쁨(1지점)으로 평가되었고, 수질은 상류와 하류 모두 좋음으로 평가되었다. 선행연구와 비교한 결과, 종수는 큰 차이를 보이지 않았으며, 과거에는 출현하였으나 본 조사에서 출현하지 않은 종은 13종이었고, 반면 본 조사에서 처음으로 출현한 종은 6종이었다. 교란요인은 하천공사와 많은 보, 외래어종 배스의 서식 등이 확인되었다. 금당천은 멸종위기종 한강납줄개를 비롯한 납자루아과(Acheilognathinae) 어류가 많이 서식하여 보존가치가 높은 지역이기 때문에, 지속적인 관심과 체계적인 보존방안이 요구된다.

Keywords

Acknowledgement

이 논문은 2021년도 국립생태원 제5차 전국자연환경조사의 연구비 지원으로 수행된 연구임(NIE-A-2023-01)

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