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Genetic heterogeneity in natural beds of the razor clam Ensis siliqua revealed by microsatellites

Published online by Cambridge University Press:  09 June 2011

Miguel A. Varela
Affiliation:
Departamento de Bioloxía Celular e Molecular, Universidade da Coruña, A Zapateira s/n, A Coruña E-15071, Spain
Andrés Martínez-Lage
Affiliation:
Departamento de Bioloxía Celular e Molecular, Universidade da Coruña, A Zapateira s/n, A Coruña E-15071, Spain
Ana M. González-Tizón*
Affiliation:
Departamento de Bioloxía Celular e Molecular, Universidade da Coruña, A Zapateira s/n, A Coruña E-15071, Spain
*
Correspondence should be addressed to: A.M. González-Tizón, Departamento de Bioloxía Celular e Molecular, Universidade da Coruña, A Zapateira s/n, A Coruña E-15071, Spain email: hakuna@udc.es

Abstract

The aim of this study was to analyse the genetic diversity and population structure in the razor clam Ensis siliqua along the European Atlantic coast taking into account their recent history of exploitation and the ‘Prestige' oil spill. To this end we examined the genetic variability of microsatellite markers in 211 razor clams from five populations in Ireland, Portugal and Spain. Microsatellite data revealed a low genetic differentiation between the Spanish and Portuguese populations (FST = 0–0.032) and a moderate differentiation of these populations and the Irish samples (FST = 0.071–0.100). Although we observed changes in genetic diversity in accordance with the level of exploitation and the distribution of the oil spill, these changes were mild and not significant after Bonferroni correction. This could be the result of a genuine low impact, lack of statistical power and/or the capacity of this species to recolonize quickly after the impact of anthropogenic stressors. Supporting the latter argument we found a significant temporal heterogeneity of allelic frequencies in samples coming from the same sampling locality that could be attributed to the movement of adults or larvae from unaffected source populations.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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