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http://dx.doi.org/10.11626/KJEB.2020.38.4.650

Phylogeographic and population genetic study of a Korean endemic freshwater fish species, Zacco koreanus  

Kim, Yu Rim (Molecular Ecology and Evolution Laboratory, Department of Biological Science, College of Science & Engineering, Sangji University)
Jang, Ji Eun (Molecular Ecology and Evolution Laboratory, Department of Biological Science, College of Science & Engineering, Sangji University)
Choi, Hee-kyu (Molecular Ecology and Evolution Laboratory, Department of Biological Science, College of Science & Engineering, Sangji University)
Lee, Hyuk Je (Molecular Ecology and Evolution Laboratory, Department of Biological Science, College of Science & Engineering, Sangji University)
Publication Information
Korean Journal of Environmental Biology / v.38, no.4, 2020 , pp. 650-657 More about this Journal
Abstract
We conducted a phylogeographic analysis of Korean endemic Zacco koreanus populations inhabiting the East-flowing river (Gangneung Yeongokcheon; GY, Yangyang Namdaecheon; YN), the Han River (Seomgang; SG, Soksacheon; SS), and the Nakdong River(Gilancheon; GA) using the mitochondrial DNA cytochrome oxidase I (COI) gene (619 bp). Population genetic analysis was further performed to assess the population connectivity for the GY river where there is a large number of human-made artificial weirs with several fishways. The phylogeographic analysis revealed that while the populations of the East-flowing river and those of the Han River formed a monophyletic lineage, the Nakdong River individuals represented a distinct lineage with 3.7-4.2% (mean=4.0%) genetic distance from the other lineages. The population genetic analysis of the GY showed that a mid-stream population harbored relatively higher mitochondrial diversity relative to up- and down-stream populations, and there was no genetic differentiation between these three populations. The latter findings might suggest high genetic connectivity between the populations via genetic flow along the fishways. However, an analysis using faster-evolving genetic markers, such as microsatellites, is needed to confirm the findings of high population connectivity. Our study suggests the possibility of the presence of cryptic species in Z. koreanus in the Nakdong River basin. However, further study with more individual samples as well as additional markers or even more advanced genomic tools is required to test our hypothesis. Ecological or phenotypic analyses should be conducted to test whether the observed Nakdong River lineage represents a different or cryptic species, or simply hidden, but excessive, intraspecific diversity.
Keywords
cryptic species; ecotype; Korean endemic freshwater fish; phylogeography; river connectivity;
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