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Looking for diversity in all the right places? Genetic diversity is highest in peripheral populations of the reef-building polychaete Sabellaria alveolata

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Abstract

Species distributions have been profoundly affected by past climate change, and are expected to change considerably in response to future environmental change. To better apprehend how future climate change is likely to affect genetic diversity in marine populations, it is essential to first evaluate the processes that have shaped the current distribution of genetic diversity in the sea. The honeycomb worm is a reef-building polychaete that hosts high biodiversity. Here we show that the genetic diversity in populations of S. alveolata is highest towards the edges of the current species range and lowest at its center. Pleistocene glacial cycles likely led to extirpations of S. alveolata from central populations in the Bay of Biscay, with coalescent-based estimates of post-glacial colonization dating to the beginning of the Holocene interglacial, from 10,000 to 14,000 years ago. Meanwhile, populations in the Irish Sea and English Channel likely persisted in glacial refugia since the Eemian interglacial, 120,000 years ago. Northern populations host at least two sets of divergent haplotypes, indicating that two refugia possibly existed in the north, with Ireland being a likely second refugium. Within biogeographic regions, populations were overall well-connected, but strong genetic differentiation suggests that little exchange occurs between regions. These two unexpected reservoirs of genetic diversity at the range edges deserve greater attention as warming temperatures threaten trailing edge populations, while greater climatic variability threatens leading edge populations.

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Availability of data and material

Newly generated mtDNA sequences have been deposited in GenBank (Accession Numbers: MT955994-MT956576).

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Acknowledgements

The authors would like to thank Dr. M. Panova and V. C. Seixas for their constructive comments on the manuscript. This is publication ISEM 2021-047

Funding

This project has been funded by the Programme National d’Environnement Côtier (PNEC) Site Atelier de la Baie du Mont Saint Michel (2001–2004) and the PNEC-AT (2004–2007).

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Authors

Contributions

FR, SFD and FV designed the study, FR, FV and SFD collected the specimens, FR acquired the sequence data, FLDN, FV and FR analyzed the data, FLDN led the writing of the manuscript and all authors were involved in the writing process.

Corresponding author

Correspondence to Flávia L. D. Nunes.

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The authors declare no conflicts of interest.

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Responsible Editor: O. Puebla.

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Reviewers: M. Panova and V. C. Seixas.

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Nunes, F.L.D., Rigal, F., Dubois, S.F. et al. Looking for diversity in all the right places? Genetic diversity is highest in peripheral populations of the reef-building polychaete Sabellaria alveolata. Mar Biol 168, 63 (2021). https://doi.org/10.1007/s00227-021-03861-8

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  • DOI: https://doi.org/10.1007/s00227-021-03861-8

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