title: Phenotypic and genetic differentiation in young-of-the-year common sole (Solea solea) at differentially contaminated nursery grounds.
abstract: Growth-related characters, condition factor, and genetic differentiation were investigated for a single cohort of young-of-the-year (YOY) sole within and among nurseries with differing levels of heavy metals (Cd, Cu and Zn) contamination in the two Charentais Straits, Bay of Biscay, France. Analyses were performed when individuals recruited (May), then after a full summer spent in each nursery (October). Levels of phenotypic and genetic diversity were compared, together with genetic differentiation at a candidate metallothionein (MT) locus and three putatively neutral microsatellite loci. No phenotypic or genetic differentiation was detected among nurseries in May, but significant variation at each phenotypic trait and at the multilocus level in October (P < 0.001). Single locus analysis demonstrated that only the MT locus was significantly differentiated among nurseries, whether corrected for null alleles or not (θ=0.0401 and θ(corr.FreeNA)=0.0326, respectively; P < 0.001). Results indicate that phenotypic differences among YOY sole nurseries present a molecular correlate acting at identical spatio-temporal scales among nurseries, potentially reflecting differential selective pressure among nurseries in response to contamination.
authors.affiliation: Université Montpellier II, Institut des Sciences de l'Evolution de Montpellier, Evolution des Poissons, CNRS UMR 5554, place E. Bataillon, c.c. 63, 34095 Montpellier, Cedex 5, France. bruno.guinand@univ-montp2.fr
authors.forename: Bruno
authors.initials: B
authors.lastname: Guinand
authors.forename: Eric D H
authors.initials: ED
authors.lastname: Durieux
authors.forename: Célie
authors.initials: C
authors.lastname: Dupuy
authors.forename: Frédérique
authors.initials: F
authors.lastname: Cerqueira
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Bégout
mesh_terms: D000818:Animals; D005412:Flatfishes / Q000145:classification / Q000235:genetics* / Q000254:growth & development; D005602:France; D005787:Gene Frequency; D014644:Genetic Variation / Q000187:drug effects*; D005838:Genotype; D019216:Metals, Heavy / Q000633:toxicity*; D010641:Phenotype; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical