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Selection and sex‐biased dispersal in a coastal shark: the influence of philopatry on adaptive variation
Author(s) -
Portnoy D. S.,
Puritz J. B.,
Hollenbeck C. M.,
Gelsleichter J.,
Chapman D.,
Gold J. R.
Publication year - 2015
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/mec.13441
Subject(s) - philopatry , biology , biological dispersal , genetic variation , evolutionary biology , gene flow , ecology , genetics , gene , population , demography , sociology
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 ( SNP s) 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 mt DNA haplotypes and putatively neutral SNP s 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.