10.5061/DRYAD.1TQ09
Sinclair-Waters, Marion
Dalhousie University
Bradbury, Ian R.
Dalhousie University
Morris, Corey J.
Dalhousie University
Lien, Sigbjorn
Norwegian University of Life Sciences
Kent, Matthew P.
Norwegian University of Life Sciences
Bentzen, Paul
Dalhousie University
Data from: Ancient chromosomal rearrangement associated with local
adaptation of a post-glacially colonized population of Atlantic Cod in the
northwest Atlantic
Dryad
dataset
2017
single nucleotide polymorphism
Population Divergence
Atlantic cod
Chromosomal rearrangement
2017-11-16T18:37:30Z
2017-11-16T18:37:30Z
en
https://doi.org/10.1111/mec.14442
8591009 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Intraspecific diversity is central to the management and conservation of
exploited species, yet knowledge of how this diversity is distributed and
maintained in the genome of many marine species is lacking. Recent
advances in genomic analyses allow for genome-wide surveys of
intraspecific diversity and offer new opportunities for exploring genomic
patterns of divergence. Here, we analyzed genome-wide polymorphisms to
measure genetic differentiation between an offshore migratory and a
non-migratory population and to define conservation units of Atlantic Cod
(Gadus morhua) in coastal Labrador. A total of 141 individuals, collected
from offshore sites and from a coastal site within Gilbert Bay, Labrador,
were genotyped using an ~11k single nucleotide polymorphism array.
Analyses of population structure revealed strong genetic differentiation
between migratory offshore cod and non-migratory Gilbert Bay cod. Genetic
differentiation was elevated for loci within a chromosomal rearrangement
found on linkage group 1 (LG1) that coincides with a previously found
double inversion associated with migratory and non-migratory ecotype
divergence of cod in the northeast Atlantic. This inverted region includes
several genes potentially associated with adaptation to differences in
salinity and temperature, as well as influencing migratory behaviour. Our
work provides evidence that a chromosomal rearrangement on LG1 is
associated with parallel patterns of divergence between migratory and
non-migratory ecotypes on both sides of the Atlantic Ocean.
Sinclair-Waters_et_al_MEC_2017_8581_SNPsGenepop file containing SNP array
data for 141 Atlantic Cod (Gadus morhua) genotyped at 8,581 loci. All SNPs
are referred to by their database of Single Nucleotide Polymorphisms
(dbSNP) accession numbers (http://www.ncbi.nlm.nih.gov/SNP). Geographic
coordinates of sample collection sites can be found in Table 1 of the
associated publication.