Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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A Study on Natural Interspecific Hybrids between Sarcocheilichthys nigripinnis morii and S. variegatus wakiya (Pisces: Cyprinidae)

중고기 Sarcocheilichthys nigripinnis morii와 참중고기 S. variegatus wakiyae (Pisces: Cyprinidae)의 자연 종간잡종에 관한 연구

  • Ji Wang Jang (Natural Environmental Restoration Institute) ;
  • Jae Goo Kim (Alpha Research Ecology Institute) ;
  • Jae Geun Ko (Natural Environmental Restoration Institute) ;
  • Bong Han Yun (Institute of Korea Eco-Network) ;
  • Mu Sung Sung (Muldeuli Research) ;
  • Yang Seop Bae (Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University)
  • 장지왕 (자연환경복원연구원) ;
  • 김재구 (알파생태연구원) ;
  • 고재근 (자연환경복원연구원) ;
  • 윤봉한 (한국생태네트워크) ;
  • 성무성 (물들이연구소) ;
  • 배양섭 (인천대학교 생명과학과)
  • Received : 2024.06.21
  • Accepted : 2024.09.13
  • Published : 2024.09.30
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Abstract

This study conducted morphological and molecular phylogenetic analyses on three presumed natural interspecific hybrids of the genus Sarcocheilichthys, collected from the main stream of the Seomjin River and its tributary, Dongbokcheon Stream, as well as their parent species, S. nigripinnis morii and S. variegatus wakiyae, to identify whether they are natural hybrids and to determine their maternal and paternal species. The results of the molecular phylogenetic analysis clearly demonstrated that the three presumed natural hybrids are indeed natural hybrids of S. nigripinnis morii and S. variegatus wakiyae, with S. nigripinnis morii identified as the maternal species and S. variegatus wakiyae as the paternal species. The three natural hybrids exhibited intermediate or unique morphological traits that were not biased towards either parent species, and distinct morphological characteristics were observed in the dorsal fin and caudal fin. In the water bodies where the natural hybrids were collected, a variety of Acheilognathinae species and spawning hosts coexisted alongside the parent species S. nigripinnis morii and S. variegatus wakiyae. It is presumed that the overlapping spawning periods and locations of S. nigripinnis morii and S. variegatus wakiyae promoted the occurrence of hybrids. The unidirectional occurrence of natural interspecific hybridization is attributed to interspecific competition and population imbalance, and the sneaker behavior of S. variegatus wakiyae males was proposed as an important mechanism.

본 연구는 섬진강 본류와 지류인 동복천에서 채집된 중고기속(genus Sarcocheilichthys) 어류의 자연 종간잡종으로 추정되는 3개체와 부모종인 중고기 S. nigripinnis morii, 참중고기 S. variegatus wakiyae를 대상으로 형태학적 및 분자계통학적 분석을 실시하여 자연잡종 여부를 동정하고, 모계종과 부계종을 판별하였다. 분자계통학적 분석 결과는 자연 종간잡종으로 추정된 3개체가 중고기와 참중고기의 자연잡종임을 명확히 입증하였으며, 모계종은 중고기, 부계종은 참중고기로 밝혀졌다. 자연잡종 3개체는 한 부모종에 편향되지 않는 중간 또는 고유한 형질이 형태적으로 우세하게 발현되었으며, 부모종과 구분되는 고유한 형태적 특성이 등지느러미와 꼬리지느러미에서 확인되었다. 자연잡종이 채집된 수역에서는 부모종인 중고기와 참중고기 외에도 다양한 납자루아과(Acheilognathinae) 어류와 산란숙주가 공존하고 있었다. 중고기와 참중고기의 산란시기와 산란장소 중복이 잡종 발생을 촉진한 것으로 추정되었다. 자연 종간 교잡이 단방향으로 발생한 이유는 동소종 간 경쟁과 개체수 불균형이 원인으로 제시되었으며, 참중고기의 sneaker 행동이 중요한 메커니즘으로 제안되었다.

Keywords

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