Abstract
Knowledge of genetic structure at the finest level is essential for the conservation of genetic resources. Despite no visible barriers limiting gene flow, significant genetic structure has been shown in marine species. The common cockle (Cerastoderma edule) is a bivalve of great commercial and ecological value inhabiting the Northeast Atlantic Ocean. Previous population genomics studies demonstrated significant structure both across the Northeast Atlantic, but also within small geographic areas, highlighting the need to investigate fine-scale structuring. Here, we analysed two geographic areas that could represent opposite models of structure for the species: (1) the SW British Isles region, highly fragmented due to biogeographic barriers, and (2) Galicia (NW Spain), a putative homogeneous region. A total of 9250 SNPs genotyped by 2b-RAD on 599 individuals from 22 natural beds were used for the analysis. The entire SNP dataset mostly confirmed previous observations related to genetic diversity and differentiation; however, neutral and divergent SNP outlier datasets enabled disentangling physical barriers from abiotic environmental factors structuring both regions. While Galicia showed a homogeneous structure, the SW British Isles region was split into four reliable genetic regions related to oceanographic features and abiotic factors, such as sea surface salinity and temperature. The information gathered supports specific management policies of cockle resources in SW British and Galician regions also considering their particular socio-economic characteristics; further, these new data will be added to those recently reported in the Northeast Atlantic to define sustainable management actions across the whole distribution range of the species.
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Data availability
Data for this study are available at Dryad Digital Repository (https://doi.org/10.5061/dryad.xpnvx0kmr) and Supplementary material.
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Acknowledgements
The authors wish to thank L. Insua, S. Sánchez-Darriba and S. Gómez from the ACUIGEN group (USC) for their technical support. Supercomputing Center of Galicia (http://www.cesga.es) provided computing facilities for genotyping. A. Casanova (ACC) was funded by a Xunta de Galicia-Campus Terra postdoctoral fellow. The authors are also indebted to COCKLES Interreg European project partners who provided samples included in this study. Finally, the authors are grateful to Prof. S. Goodacre, Dr X. Zhan and three anonymous reviewers for their helpful comments on the earlier version of this manuscript.
Funding
This study has been supported by the COCKLES project (grant number: EAPA_458/2016) of the INTERREG EUROPEAN PROGRAMME and the NERC-SHEAR project (NE/W001217/1).
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MV, AV and PM designed and supervised the study. DI, AC, KM, FO, SKM and SL performed field collections. PM, SCC, SL, PER, SKM and FO provided funding. FM, MH and AB analysed bioinformatically genomic sequences and created genotyping files. SBW and PER provided information about oceanography, environmental variables and developed geographic maps included in the figures. MV, CB, ACC, AB and PM performed the genetic analyses. MV and PM wrote the manuscript with contributions from all authors. All of them read the manuscript and gave their approval.
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Vera, M., Wilmes, S.B., Maroso, F. et al. Heterogeneous microgeographic genetic structure of the common cockle (Cerastoderma edule) in the Northeast Atlantic Ocean: biogeographic barriers and environmental factors. Heredity 131, 292–305 (2023). https://doi.org/10.1038/s41437-023-00646-1
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DOI: https://doi.org/10.1038/s41437-023-00646-1