RADseq analyses reveal concordant Indian Ocean biogeographic and phylogeographic boundaries in the reef fish Dascyllus trimaculatus

E. M. Salas, G. Bernardi, Michael L. Berumen, M. R. Gaither, L. A. Rocha

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Population genetic analysis is an important tool for estimating the degree of evolutionary connectivity in marine organisms. Here, we investigate the population structure of the three-spot damselfish Dascyllus trimaculatus in the Red Sea, Arabian Sea and Western Indian Ocean, using 1174 single nucleotide polymorphisms (SNPs). Neutral loci revealed a signature of weak genetic differentiation between the Northwestern (Red Sea and Arabian Sea) and Western Indian Ocean biogeographic provinces. Loci potentially under selection (outlier loci) revealed a similar pattern but with a much stronger signal of genetic structure between regions. The Oman population appears to be genetically distinct from all other populations included in the analysis. While we could not clearly identify the mechanisms driving these patterns (isolation, adaptation or both), the datasets indicate that population-level divergences are largely concordant with biogeographic boundaries based on species composition. Our data can be used along with genetic connectivity of other species to identify the common genetic breaks that need to be considered for the conservation of biodiversity and evolutionary processes in the poorly studied Western Indian Ocean region.
Original languageEnglish (US)
Pages (from-to)172413
JournalRoyal Society Open Science
Issue number5
StatePublished - May 29 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): CRG-1-2012-BER-002
Acknowledgements: Acknowledgements. We thank JP Hobbs, JD DiBattista, C Rocha, A Sellas, BW Bowen, M Bernal, HT Pinheiro, I FernandezSilva, SA Jones, J Copus and B Simison for their help in the laboratory and fruitful discussions and J Chadha and TA Quiros for their timely contributions. We also thank the British Indian Ocean Territory Administration, the Chagos Conservation Trust, and Charles and Anne Sheppard for obtaining permits and facilitating the expedition on which materials were collected from the Chagos Archipelago. We also thank D Wagner and SA Jones for the assistance with field collections. We thanks D Hogan, E Lassiter and anonymous reviewers for the comments that greatly
improved the manuscript.


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