Zoological Studies

Vol. 61, 2022

(update: 2022.6.28)

Population Genetic Structures and Demographic Expansion of Exotic Jellyfish Carybdea brevipedalia in Korean Coasts Inferred from Mitochondrial COI Analysis

Buhari Lawan Muhammad1, Yoseph Seo1, Jinho Chae2, and Jang-Seu Ki1,*

1Eepartment of Biotechnology, Sangmyung University, Seoul 03016, South Korea. *Correspondence: E-mail: kijs@smu.ac.kr (Ki). Phone: +82-2-2287-5449, Fax: +82-2-2287-0070.
E-mail: buharilawan20@gmail.com (Muhammad); akdldytpq12@gmail.com (Seo)
2Marine Environmental Research and Information Laboratory, Gunpo 15850, South Korea. E-mail: jinhochae@gmail.com (Chae)

Received 28 January 2022 / Accepted 30 May 2022
Communicated by James D. Reimer

Carybdea brevipedalia Kishinouye, 1891 is a poisonous jellyfish that usually populates only in Japanese coastal regions. However, it has recently been found on the Korean coast and its known geographic range has expanded. In this study, we analyzed the population genetics and demographic histories of 113 C. brevipedalia specimens from the southern and eastern coastal regions of Korea by sequencing mitochondrial DNA cytochrome c oxidase subunit I (COI). We identified 42 C. brevipedalia COI haplotypes with high genetic diversity and a significant genetic structure. Populations were highly differentiated based on geographic location and distinctly divided into A and B clades. The results of Mantel tests indicated that geographic distance influenced the genetic distance between the two clades. Moreover, demographic analyses (neutrality tests) and the star-like profile of the Templeton, Crandall, and Sing haplotype network indicated that C. brevipedalia had recently expanded to the southern and eastern coastal regions of Korea. These findings suggested that C. brevipedalia populations along the Korean coast had significant genetic differentiation that could be influenced by geographic isolation and subsequent adaptation to regional ecological conditions.

Key words: Carybdea brevipedalia, Cytochrome c oxidase subunit I (COI), Exotic species, Genetic differentiation, Population expansion.

Citation: Muhammad BL, Seo Y, Chae J, Ki JS. 2022. Population genetic structure and demographic expansion of the exotic jellyfish Carybdea brevipedalia (Cubozoa, Cnidaria) into the Korean coast. Zool Stud 61:48.