Abstract
The coastal shrimp Crangon crangon is an ecologically and commercially important species but there is limited knowledge of its genetic population structure. We utilised amplified fragment length polymorphisms (AFLPs) to investigate population differentiation among eight sampling locations comprising paired sites from north- and south-western Britain, the eastern English Channel and the Baltic Sea. Initial AMOVA and cluster analysis suggested strong differentiation, but outlier analysis identified three loci that might be subject to selection, one of which showed significant latitudinal variation in allele frequencies. Following exclusion of these outlier loci, and also of a divergent, genetically-impoverished sample from the UK Bristol Channel, cluster analysis revealed three major groupings, corresponding to geographical regions: western Britain, the eastern English Channel and the Baltic Sea. AMOVA identified significant differentiation both within and among these regions, with similar variation explained by each hierarchical level. C. crangon shows greater genetic structuring than has been found in many decapod crustaceans studied to date, and our results are consistent with unstable population sizes and gene flow restricted by distance and probably also hydrographic features. Further investigation of temporal stability in population structure is required, but broad-scale homogeneity of fishery stocks should not be assumed.
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Acknowledgments
We are grateful to members of the CEFAS Lowestoft Shellfish team, in particular Steven Lovewell and Peter Walker, and to Hans Francke and Cattriona Clemmsen for providing samples, and to the many others, who provided samples that could not be included in the present study. Jennifer Ovenden kindly provided a copy of an unpublished report on effective population size in Penaeus. We are also grateful to Craig Wilding for supplying a protocol upon which our AFLP methodology was based. We thank David Lunt and Africa Gomez for helpful discussion. This study conformed to UK and European legislation and guidance for the use of animals in scientific research and was funded by a grant to LH and PWS from the Department for Environment, Food and Rural Affairs (Defra project code MF0226).
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Communicated by J. P. Thorpe, Port Erin.
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Weetman, D., Ruggiero, A., Mariani, S. et al. Hierarchical population genetic structure in the commercially exploited shrimp Crangon crangon identified by AFLP analysis. Mar Biol 151, 565–575 (2007). https://doi.org/10.1007/s00227-006-0497-8
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DOI: https://doi.org/10.1007/s00227-006-0497-8