Selection and sex-biased dispersal in a coastal shark: The influence of philopatry on adaptive variation
Article
Portnoy, DS, Puritz, JB, Hollenbeck, CM et al. (2015). Selection and sex-biased dispersal in a coastal shark: The influence of philopatry on adaptive variation
. MOLECULAR ECOLOGY, 24(23), 5877-5885. 10.1111/mec.13441
Portnoy, DS, Puritz, JB, Hollenbeck, CM et al. (2015). Selection and sex-biased dispersal in a coastal shark: The influence of philopatry on adaptive variation
. MOLECULAR ECOLOGY, 24(23), 5877-5885. 10.1111/mec.13441
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.
