Restricted gene flow among western Indian Ocean populations of the mangrove whelk Terebralia palustris (Linnaeus, 1767) (Caenogastropoda: Potamididae)
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To investigate gene-flow patterns in the western Indian Ocean (WIO), tissue samples of Terebralia palustris were collected along the coasts of East Africa and Madagascar. A fragment of the mitochondrial cytochrome c oxidase subunit I (COI) gene was sequenced in 308 individuals from 18 sites. Based on a COI fragment of 624 base pairs, 43 haplotypes were identified. The two most abundant haplotypes were shared among all sample sites, but 20.9% of the haplotypes were restricted to the sites in southern Mozambique. Population expansion was found and confirmed by moderate haplotype diversity, low nucleotide diversity and the analysis of demographic history. Analysis of molecular variances (AMOVA) revealed significant genetic differentiation among populations (φst = 0.10, P ≤ 0.001). Pairwise φst and a hierarchical AMOVA (φct = 0.04, P = 0.01) suggest significant genetic differentiation among five regions: (1) northern Kenya, (2) Kenya, Tanzania and western Madagascar, (3) northeastern Madagascar, (4) southern Madagascar and (5) southern Mozambique. Since the analysis of isolation by distance did not show a significant correlation between geographic distance and genetic differentiation, even though the maximum distance between sites is about 3,050 km (Z = 7,513.89, r = 0.12, P = 0.08), the complex oceanography in the WIO could be the main factor that restricts gene flow.
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Molluscs, arthropods, and fishes in the region also show genetic connectivity without a clear genetic break.
“Genetic connectivity without a clear genetic break was also found in molluscs (Ratsimbazafy and Kochzius 2018;Nehemia et al. 2019), arthropods (Rumisha et al. 2017) and fishes (Huyghe and Kochzius 2018).”
From Population genetics of the brooding coral Seriatopora hystrix reveals patterns of strong genetic differentiation in the Western Indian Ocean (2021) · cites this paper as Ratsimbazafy and Kochzius 2018
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Cited by
Sorted by citations
van der Ven, R. M., Flot, J.-F., Buitrago-López, C., & Kochzius, M. (2021) · Heredity · doi:10.1038/s41437-020-00379-5 · Cited by 26 · see citing works
Self-citation
- Authors
- Ratsimbazafy, H. A., & Kochzius, M.
- Affiliations
- Vrije Universiteit Brussel (BE)
- Corresponding author
- Ratsimbazafy, Hajaniaina Andrianavalonarivo
- Venue
- Journal of Molluscan Studies
- Publisher
- Oxford University Press (OUP)
- Published
- 2018-02-08
- Volume
- 84
- Issue
- 2
- Pages
- 163-169
- ISSN
- 0260-1230 (ISSN-L)
- 1464-3766
- OpenAlex
- W2789705455
- Cited by
- 25
- References
- 51
- Citations by year
- 2026: 4 · 2025: 1 · 2024: 7 · 2023: 5 · 2022: 2 · 2021: 2 · 2020: 2 · 2019: 1 · 2018: 1
- FWCI
- 0.92
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Molluscan Studies (publishedVersion)
- Flanders Marine Institute (Flanders Marine Institute) (submittedVersion)
- VUBIR (Vrije Universiteit Brussel) (submittedVersion)
- Funders
- Fonds Wetenschappelijk Onderzoek
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine Biology and Ecology Research
- Physical Sciences › Environmental Science › Ecology › Coral and Marine Ecosystems Studies
- Keywords
- Terebralia palustris, gene flow, population structure, mitochondrial COI haplotypes, genetic differentiation, population growth, isolation by distance, oceanographic barriers, Western Indian Ocean, Madagascar, East Africa, Mozambique
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