TY - JOUR T1 - Genetic structure of the common sole (Solea solea) in the Bay of Biscay: Nurseries as units of selection? A1 - Guinand,B A1 - Rolland,Jean-Luc A1 - Bonhomme,Francois AD - Univ Montpellier 2, Inst Sci Evolut Montpellier, CNRS, UMR 5554, F-34095 Montpellier 5, France. AD - Univ Montpellier 2, IFREMER, F-34095 Montpellier, France. AD - Stn Mediterraneenne Environm Littoral, F-34200 Sete, France. UR - https://archimer.ifremer.fr/doc/00000/4299/ DO - 10.1016/j.ecss.2007.12.005 KW - Selection KW - Genetic drift KW - EPIC PCR KW - Population genetics KW - Coastal nurseries KW - Juveniles KW - Flatfish N2 - Coastal and estuarine areas in the Bay of Biscay are essential nursery habitats for sole (Solea solea). Using three intronic markers, we investigated patterns of genetic differentiation among cohorts of juveniles (0+, 1+, sub-adults) inhabiting four major nurseries in the Vilaine and Loire river estuaries, the Pertuis d' Antioche strait, and the Gironde estuary. Genetic differentiation was not significant for the age 0- and 1-groups, but was among sub-adult samples (theta(WC) = 0.017; P = 0.031). Hierarchical analyses of genotypic frequencies by nested multivariate ANOVA using redundancy analysis indicated that northern nurseries of Loire and Vilaine rivers had different patterns of genotypic variation with age than southern nurseries of the Pertuis d' Antioche and Gironde estuaries (F = 1.36; P = 0.007). Bay of Biscay nurseries appeared to be spatially structured between a southern and a northern group that exhibit different genotypic distributions. Genetic drift and gene flow explains this pattern poorly, but a statistical test (P < 0.035) suggested that the metallothionein (MT) locus may be significantly impacted by selection in southern estuaries. As metallothionein is involved in heavy-metal detoxification, and southern nurseries are known to be affected by cadmium, this indicates a possible correlation between observed genotypic distributions and some nursery habitat features in sole. Some selective patterns might also be proposed to explain patterns of linkage disequilibrium observed at amylase loci in three of the four nurseries. (C) 2008 Elsevier Ltd. All rights reserved. Y1 - 2008/06 PB - Elsevier JF - Estuarine, Coastal and Shelf Science SN - 0272-7714 VL - 78 IS - 2 SP - 316 EP - 326 ID - 4299 ER -