Intraspecific phylogeographic genomics from multiple complete mtDNA genomes in Atlantic cod (Gadus morhua): origins of the "codmother," transatlantic vicariance and midglacial population expansion.

Genetics
Steven M Carr, H Dawn Marshall

Abstract

On the basis of multiple complete mitochondrial DNA genome sequences, we describe the temporal phylogeography of Atlantic cod (Gadus morhua), a lineage that has undergone a complex pattern of vicariant evolution, postglacial demographic shifts, and historic sharp population declines due to fishing and/or environmental shifts. Each of 32 fish from four spawning aggregations from the northwest Atlantic and Norway has a unique mtDNA sequence, which differs by 6-60 substitutions. Phylogenetic analysis identifies six major haplogroups that range in age from 37 to 75 KYA. The widespread haplotype identified by previous single-locus analyses at the center of a "star phylogeny" is shown to be a paraphyletic assemblage of genome lineages. The coalescent that includes all cod occurs 162 KYA. The most basal clade comprises two fish from the western Atlantic. The most recent superclade that includes all fish examined from Norway, and which includes 84% of all fish examined, dates to 128 KYA at the Sangamon/Würm interglacial, when ocean depths on continental shelves would have favored transcontinental movement. The pairwise mismatch distribution dates population expansion of this superclade to the middle of the Wisconsinan/Weichsel glaciati...Continue Reading

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Jul 2, 2010·Proceedings. Biological Sciences·Ian R BradburyPaul Bentzen
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