Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
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Distribution Aspects and Extinction Threat Evaluation of the Endangered Species, Rhynchocypris semotilus (Pisces: Cyprinidae)

멸종위기어류 버들가지 Rhynchocypris semotilus(Pisces: Cyprinidae)의 분포양상과 멸종위협 평가

  • Received : 2021.08.24
  • Accepted : 2021.09.17
  • Published : 2021.09.30
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Abstract

Distribution aspects and extinction threat evaluation of the endangered species, Rhynchocypris semotilus were investigated in Goseong-gun, Gangwon-do, Korea, June 2020. Among the 12 sampling sites investigated during the study period, samples of R. semotilus were collected 268 individuals at 6 sites. The streams inhabited of R. semotilus were Songhyeoncheon (3 stations), Gojindong (2 stations) and Osodong (1 station). The main habitats of R. semotilus were uppermost and upper stream (Aa type) with 3~15 m water flow width, 0.3~1.3 m depth and high ratio boulder and cobble bottoms. The estimated age of the R. semotilus (June) based on their total length distribution indicated that 0-, 1-, 2-, 3- and more than 4-year-old were 6~27 mm, 38~59 mm, 60~75 mm, 78~93 mm and 96~125 mm, respectively, and their has matured reproductive organs over two years old. R. semotilus investigation results of the threat of extinction showed no tendency to decrease in population size, but estimated to be less than 1,000 mature individuals, with a small range of extend of occurrence (39.668 km2), area of occupancy (16 km2), and number of disconnected locations (3 locations). Therefore, R. semotilus is now considered vulnerable (VU D2) based on the IUCN Red List categories and criteria.

우리나라 멸종위기어류 버들가지 Rhynchocypris semotilus의 분포양상과 멸종위협을 평가하기 위해 강원도 고성군에서 2020년 6월에 분포조사를 실시하였다. 분포조사는 모두 12개 지점을 조사하여 6개 지점에서 268개체를 채집하였는데, 하천별로는 송현천(3개 지점), 고진동(2개), 오소동(1개) 순으로 지점수가 많았다. 버들가지 서식지는 하천 최상류 또는 상류(하천형 Aa type)의 유폭 3~15 m, 수심은 0.3~1.3 m로 하상은 큰돌과 작은돌의 비율이 높은 곳이었다. 전장빈도분포도(6월)로 연령을 추정한 결과, 전장 6~27 mm는 당년생, 38~59 mm는 만 1년생, 60~75 mm 만 2년생, 78~93 mm는 만 3년생, 96~125 mm는 만 4년생 이상으로 추정되었고, 생식소가 성숙되는 연령은 만 2년생 이상이었다. 버들가지의 멸종위협 등급을 IUCN 평가기준에 따라 평가하면, 개체군 크기는 크게 감소하지 않았으나, 성숙개체수는 1,000개체 이하로 추정되고, 적은 출현범위(39.668 km2)와 점유면적(16 km2), 지소수(3지소)를 보여 멸종위협 범주인 취약(VU D2)으로 평가되었다.

Keywords

Acknowledgement

본 연구는 국립생태원의 2020년 멸종위기 야생생물 전국 분포조사 일환으로 조사되었으며, 본 조사가 진행될 수 있도록 협조해주신 군 관계자 분들게 감사드립니다.

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