Incorporating deep and shallow components of genetic structure into the management of Alaskan red king crab

Abstract Observed patterns of genetic variability among marine populations are shaped not only by contemporary levels of gene flow, but also by divergences during historical isolations. We examined variability at 15 SNP loci and in mtDNA sequences (COI, 665 bp) in red king crab from 17 localities in...

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Bibliographic Details
Published in:Evolutionary Applications
Main Authors: William Stewart Grant, Wei Cheng
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2012
Subjects:
Bering Sea
genetic population structure
marine crustacean
mitochondrial DNA
northeastern Pacific
Paralithodes camtschaticus
Evolution
QH359-425
Okhotsk
Gulf of Alaska
Pacific
Norton Sound
okhotsk sea
Red king crab
Alaska
Aleutian Islands
Online Access:https://doi.org/10.1111/j.1752-4571.2012.00260.x
https://doaj.org/article/31d1a1fee8564bbc9bb28957ba9bebfc
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Summary:Abstract Observed patterns of genetic variability among marine populations are shaped not only by contemporary levels of gene flow, but also by divergences during historical isolations. We examined variability at 15 SNP loci and in mtDNA sequences (COI, 665 bp) in red king crab from 17 localities in the North Pacific. These markers define three geographically distinct evolutionary lineages (SNPs, FCT = 0.054; mtDNA ΦCT = 0.222): (i) Okhotsk Sea–Norton Sound–Aleutian Islands, (ii) southeastern Bering Sea–western Gulf of Alaska, and (iii) Southeast Alaska. Populations in the Bering Sea and in Southeast Alaska are genetically heterogeneous, but populations in the center of the range are homogeneous. Mitochondrial DNA diversity drops from h = 0.91 in the northwestern Pacific to h = 0.24 in the Southeast Alaska. Bayesian skyline plots (BSPs) indicate postglacial population expansions, presumably from ice‐age refugia. BSPs of sequences simulated under a demographic model defined by late Pleistocene temperatures failed to detect demographic variability before the last glacial maximum. These results sound a note of caution for the interpretation of BSPs. Population fragmentation in the Bering Sea and in Southeast Alaskan waters requires population management on a small geographic scale, and deep evolutionary partitions between the three geographic groups mandate regional conservation measures.

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