A migration-associated supergene reveals loss of biocomplexity in Atlantic cod.

ABSTRACT: Chromosome structural variation may underpin ecologically important intraspecific diversity by reducing recombination within supergenes containing linked, coadapted alleles. Here, we confirm that an ancient chromosomal rearrangement is strongly associated with migratory phenotype and individual genetic structure in Atlantic cod (Gadus morhua) across the Northwest Atlantic. We reconstruct trends in effective population size over the last century and reveal declines in effective population size matching onset of industrialized harvest (after 1950). We find different demographic trajectories between individuals homozygous for the chromosomal rearrangement relative to heterozygous or homozygous individuals for the noninverted haplotype, suggesting different selective histories across the past

SUBMITTER: Kess T 

PROVIDER: S-EPMC6594766 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature