title: Selection and sex-biased dispersal in a coastal shark: the influence of philopatry on adaptive variation.
abstract: Sex-biased dispersal is expected to homogenize nuclear genetic variation relative to variation in genetic material inherited through the philopatric sex. When site fidelity occurs across a heterogeneous environment, local selective regimes may alter this pattern. We assessed spatial patterns of variation in nuclear-encoded, single nucleotide polymorphisms (SNPs) and sequences of the mitochondrial control region in bonnethead sharks (Sphyrna tiburo), a species thought to exhibit female philopatry, collected from summer habitats used for gestation. Geographic patterns of mtDNA haplotypes and putatively neutral SNPs confirmed female philopatry and male-mediated gene flow along the northeastern coast of the Gulf of Mexico. A total of 30 outlier SNP loci were identified; alleles at over half of these loci exhibited signatures of latitude-associated selection. Our results indicate that in species with sex-biased dispersal, philopatry can facilitate sorting of locally adaptive variation, with the dispersing sex facilitating movement of potentially adaptive variation among locations and environments.
authors.affiliation: Department of Life Sciences, Marine Genomics Laboratory, Harte Research Institute, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX, 78412, USA.
authors.forename: D S
authors.initials: DS
authors.lastname: Portnoy
authors.affiliation: Department of Life Sciences, Marine Genomics Laboratory, Harte Research Institute, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX, 78412, USA.
authors.forename: J B
authors.initials: JB
authors.lastname: Puritz
authors.affiliation: Department of Life Sciences, Marine Genomics Laboratory, Harte Research Institute, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX, 78412, USA.
authors.forename: C M
authors.initials: CM
authors.lastname: Hollenbeck
authors.affiliation: University of North Florida, 1 UNF Drive, Jacksonville, FL, 32224, USA.
authors.forename: J
authors.initials: J
authors.lastname: Gelsleichter
authors.affiliation: Stony Brook University, Stony Brook, NY, 11776, USA.
authors.forename: D
authors.initials: D
authors.lastname: Chapman
authors.affiliation: Department of Life Sciences, Marine Genomics Laboratory, Harte Research Institute, Texas A&M University-Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX, 78412, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Gold
mesh_terms: D000220:Adaptation, Biological / Q000235:genetics*; D063147:Animal Distribution; D000818:Animals; D004272:DNA, Mitochondrial / Q000235:genetics; D005260:Female; D051456:Gene Flow; D014644:Genetic Variation; D005828:Genetics, Population; D060851:Gulf of America; D006239:Haplotypes; D008297:Male; D020641:Polymorphism, Single Nucleotide; D012641:Selection, Genetic; D017422:Sequence Analysis, DNA; D012737:Sex Factors; D012754:Sharks / Q000235:genetics*
chemical_list: D004272:DNA, Mitochondrial
keywords: elasmobranchs; genome scan; localized adaptation; male-mediated gene flow