Data from: Genomic divergence between the migratory and stationary ecotypes of Atlantic cod
Atlantic cod displays a range of phenotypic and genotypic variations, which includes the differentiation into coastal stationary and offshore migratory types of cod that co-occur in several parts of its distribution range and are often sympatric on the spawning grounds. Differentiation of these ecot...
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Zusammenfassung: | Atlantic cod displays a range of phenotypic and genotypic variations,
which includes the differentiation into coastal stationary and offshore
migratory types of cod that co-occur in several parts of its distribution
range and are often sympatric on the spawning grounds. Differentiation of
these ecotypes may involve both historical separation and adaptation to
ecologically distinct environments, the genetic basis of which is now
beginning to be unravelled. Genomic analyses based on recent sequencing
advances are able to document genomic divergence in more detail and may
facilitate the exploration of causes and consequences of genome-wide
patterns. We examined genomic divergence between the stationary and
migratory types of cod in the Northeast Atlantic, using next-generation
sequencing of pooled DNA from each of two population samples. Sequence
data was mapped to the published cod genome sequence, arranged in more
than 6000 scaffolds (611 Mb). We identified 25 divergent scaffolds (26 Mb)
with a higher than average gene density, against a backdrop of overall
moderate genomic differentiation. Previous findings of localized genomic
divergence in three linkage groups were confirmed, including a large (15
Mb) genomic region, which seems to be uniquely involved in the divergence
of migratory and stationary cod. The results of the pooled sequencing
approach support and extend recent findings based on single-nucleotide
polymorphism markers and suggest a high degree of reproductive isolation
between stationary and migratory cod in the North-east Atlantic. |
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DOI: | 10.5061/dryad.b9p8v |