Population genetic structure and historical demography of Saccostrea echinata in the Northern South China sea and Beibu Gulf
Li, Yafang, Wang, Lianggen, Wang, Yingmin, Tang, Quehui, Liu, Shuangshuang, Ning, Jiajia, Huang, Delian, Xu, Lei, and Du, Feiyan (2025) Population genetic structure and historical demography of Saccostrea echinata in the Northern South China sea and Beibu Gulf. Scientific Reports, 15 (1). 8261.
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Abstract
Marine invertebrates, such as oysters, were once thought to form large, panmictic populations with little genetic differentiation due to their high reproductive capacity and dual life stages. However, recent studies have shown significant genetic structuring and moderate gene flow across populations, influenced by factors like ocean currents, historical climate events, and environmental changes. The black-lip oyster (Saccostrea echinata), with its extensive dispersal potential, is ideal for population genetics studies. In current study, mitochondrial DNA (COI gene) was utilized to investigate the population structure, genetic diversity, and demographic history of S. echinata in the northern South China Sea (NSCS) and Beibu Gulf. Results revealed high genetic diversity with 82 haplotypes from 190 specimens, a star-shaped haplotype network, and significant genetic differentiation, with most variation occurring within populations. Genetic analysis identified three distinct genetic groups across the sampled regions. Historical demographic analysis indicated population expansion approximately 44–155 Kya after the Last Glacial Maximum. Genetic structure was shaped by historical climatic events causing isolation and secondary contact, as well as contemporary ocean currents influencing gene flow. The study highlights the complex interplay of genetic diversity, population structure, and historical dynamics in S. echinata, with implications for conservation and aquaculture in the Asia-Pacific region.
| Item ID: | 88473 |
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| Item Type: | Article (Research - C1) |
| ISSN: | 2045-2322 |
| Keywords: | Black-lip oyster (Saccostrea echinata), Genetic differentiation, Historical Climatic events, Marine invertebrates, Mitochondrial DNA (COI gene), Population structure |
| Copyright Information: | © The Author(s) 2025. This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/. |
| Date Deposited: | 22 Apr 2026 06:50 |
| FoR Codes: | 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100% |
| SEO Codes: | 18 ENVIRONMENTAL MANAGEMENT > 1805 Marine systems and management > 180504 Marine biodiversity @ 100% |
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