Korean Journal of Ichthyology (한국어류학회지)

The Ichthyological Society of Korea (한국어류학회)
권호 표지

Species and Hybrid Identification of Genus Coreoleuciscus Species in Hwnag-ji Stream, Nakdong River Basin in Korea

낙동강 상류 황지천에 서식하는 쉬리속(genus Coreoleuciscus) 어류 집단의 종 동정 및 잡종 판별

  • Song, Ha-Yoon (Inland Fisheries Research Institute, National Institute of Fisheries Science) ;
  • Kim, Jae-Hun (Department of Life Science, Soonchunhyang University) ;
  • Seo, In-Young (Department of Life Science, Soonchunhyang University) ;
  • Bang, In-Chul (Department of Life Science, Soonchunhyang University)
  • 송하윤 (국립수산과학원 중앙내수면연구소) ;
  • 김재훈 (순천향대학교 생명시스템학과) ;
  • 서인영 (순천향대학교 생명시스템학과) ;
  • 방인철 (순천향대학교 생명시스템학과)
  • Received : 2017.02.01
  • Accepted : 2017.03.15
  • Published : 2017.03.31
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Abstract

A natural hybrid of interspecific between the Coreoleuciscus splendidus and C. aeruginos (Cypriniformes: Cyprinidae) was captured in the Hwang-ji Stream, a tributary of the Nakdong River basin in Korea. An interspecific hybrid between C. splendidus and C. aeruginos was genetically identified based on morphological characteristics and the sequence analysis of nuclear recombination activating gene 1 (RAG1) gene (1,334 bp) and mitochondrial cytochrome c oxidase subunit 1 (CO1) gene (1,551 bp). As a result of morphological variations, the natural hybrid appeared to have an intermediate character between two parental species (C. splendidus and C. aeruginos) in three variations of black array (s) on dorsal, caudal and anal fin rays. Phylogenetic analysis inferred from RAG1 and CO1 sequence data revealed that Coreoleuciscus populations from Hwang-ji stream consist of two pure Coreoleuciscus species and a hybrid individual group. The individuals were clearly identified the cross and reciprocal hybrid by CO1 gene analysis. In RAG1 gene, 13 nucleotide variation loci were detected and the hybrid individuals displayed the double peaks of sequence chromatograms at the 9 diagnostic positions. In this study, molecular data and morphological variations were clearly demonstrated that hybridization did occur between C. splendidus and C. aeruginos. However, F2 hybrid generation and reproductive capacity of F1 hybrid individuals were not demonstrated.

낙동강 상류 지류인 황지천에서 쉬리(Coreoleuciscus splendidus)와 참쉬리(C. aeruginosa)의 종 간 자연잡종 개체를 채집하였다. 쉬리와 참쉬리의 종 간 잡종 개체는 외부형태 비교와 함께 핵 DNA의 RAG1 유전자(1,334 bp)와 미토콘드리아 DNA인 CO1 유전자(1,551 bp)를 이용한 염기서열 분석을 실시하였다. 외부형태 분석결과 잡종 개체는 등지느러미, 꼬리지느러미 및 뒷지느러미 3곳에서 지느러미 반문의 형태가 쉬리와 참쉬리의 중간 형태를 나타내었다. RAG1과 CO1 유전자를 이용한 분자계통 분석결과 황치천에 분포하는 쉬리속 어류는 쉬리, 참쉬리 두 종과 두 종 간의 잡종 개체군으로 구성되어 있음을 확인하였으며, CO1 유전자의 염기서열 분석결과 순종인 정교배체와 잡종인 상반교배체가 잘 구분되었다. 또한 RAG1 유전자 분석결과 13개의 염기서열 변이를 확인하였고, 잡종 개체는 9개의 염기서열에서 double peaks가 확인되었다. 유전학적 분석과 외부형태 변이 분석에 의해 쉬리와 참쉬리 사이에 잡종화가 발생한 것을 확인하였으나 잡종 F2세대와 잡종 F1 세대의 생식적 격리 여부는 확인하지 못하였다.

Keywords

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