Abstract
An important consideration when implementing species management is preserving genetic variation, which is fundamental to the long-term persistence of populations and adaptive potential of the species. The European water vole Arvicola amphibius is of high conservation importance in the United Kingdom due to its documented decline in both distribution and abundance. Conservation strategies for this species include protecting source populations, increasing habitat availability and connectivity, non-native predator control and reintroduction. We used mtDNA control region sequences and eight microsatellite markers from samples collected from 12 localities in southeast England, to determine how genetic variation is structured amongst regional water vole populations and to what extent population structure has been influenced by reintroductions. We found high haplotype diversity (h) across native populations in the southeast region and evidence that divergent lineages had been introduced to the region. We detected significant structure between watersheds with mtDNA from native populations and evidence of finer scale structure between populations within watersheds with both mtDNA and microsatellites. We suggest that management strategies should aim to conserve genetic diversity at a population level and that watersheds are a practicable unit for prioritising management within regions. We propose that introductions to restore or augment water voles within watersheds should consider the genetic composition of regional populations and highlight that genetic data has an important role in guiding future conservation options that secure adaptive potential in the face of future environmental change.
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Acknowledgements
We are grateful to all the landowners and volunteers for support with field work. In particular, we would like to thank Chloe Sadler and Fran Southgate from the Wildlife Trusts, Paul Stevens and Adam Salmon from the Wildfowl and Wetlands Trust, and Jane Reeves and volunteers from the Manhood Wildlife Trust and Heritage Group. We would also like to acknowledge Hampshire Biodiversity Information Centre, Hampshire Mammal Group, Kent Biodiversity Records Centre, Kent Mammal Group and Greenspace Information for Greater London for kindly providing distributional data on water voles. Lastly, we would also like to thank Inga Zeisset from the University of Brighton for her valuable comments on the manuscript. This project was part funded by the Arun & Rother Connections Heritage Lottery Fund, the Environment Agency and the Royal Geographical Society with IBS Postgraduate Research Award.
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Baker, R.J., Scott, D.M., King, P.J. et al. Genetic structure of regional water vole populations and footprints of reintroductions: a case study from southeast England. Conserv Genet 21, 531–546 (2020). https://doi.org/10.1007/s10592-020-01268-4
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DOI: https://doi.org/10.1007/s10592-020-01268-4