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.

서 론
재료 및 방 법
    1. 시료 확보
    2. 형태학적 분석
    3. Genomic DNA 추출 및 sequencing
    4. 염기서열 및 분자계통학적 분석
결 과
    1. 동소종
    2. 형태학적 분석
    3. 분자계통학적 분석
고 찰
적 요
REFERENCES

• 장지왕(자연환경복원연구원, 인천대학교 생명과학과) | Ji Wang Jang (Natural Environmental Restoration Institute, Daejeon 34410, Republic of Korea, Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 22012, Republic of Korea)
• 김재구(알파생태연구원) | Jae Goo Kim (Alpha Research Ecology Institute, Gunsan 54151, Republic of Korea)
• 고재근(자연환경복원연구원) | Jae Geun Ko (Natural Environmental Restoration Institute, Daejeon 34410, Republic of Korea)
• 윤봉한(한국생태네트워크) | Bong Han Yun (Institute of Korea Eco- Network, Daejeon 34028, Republic of Korea)
• 성무성(물들이연구소) | Mu Sung Sung (Muldeuli Research, Icheon 12607, Republic of Korea)
• 배양섭(인천대학교 생명과학과, 인천대학교 생물자원환경연구소, 매개곤충자원융복합연구센터) | Yang Seop Bae (Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University, Incheon 22012, Republic of Korea, Bio-Resource and Environmental Center, Incheon National University, Incheon 22012, Republic of Korea, Convergence Research Center for Insect Vectors, Incheon 22012, Republic of Korea) Corresponding author