What Maintains the Central North Pacific Genetic Discontinuity in Pacific Herring?

Pacific herring show an abrupt genetic discontinuity in the central North Pacific that represents secondary contact between refuge populations previously isolated during Pleistocene glaciations. Paradoxically, high levels of gene flow produce genetic homogeneity among ocean-type populations within e...

Full description

Bibliographic Details
Published in:PLoS ONE
Main Authors: Liu, Ming, Lin, Longshan, Gao, Tianxiang, Yanagimoto, Takashi, Sakurai, Yasunori, Grant, W. Stewart
Format: Text
Language:English
Published: Public Library of Science 2012
Subjects:
Research Article
Bering Sea
Pacific
Alaska
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3532504
http://www.ncbi.nlm.nih.gov/pubmed/23300525
https://doi.org/10.1371/journal.pone.0050340
Description
Summary:Pacific herring show an abrupt genetic discontinuity in the central North Pacific that represents secondary contact between refuge populations previously isolated during Pleistocene glaciations. Paradoxically, high levels of gene flow produce genetic homogeneity among ocean-type populations within each group. Here, we surveyed variability in mtDNA control-region sequences (463 bp) and nine microsatellite loci in Pacific herring from sites across the North Pacific to further explore the nature of the genetic discontinuity around the Alaska Peninsula. Consistent with previous studies, little divergence (ΦST = 0.011) was detected between ocean-type populations of Pacific herring in the North West Pacific, except for a population in the Yellow Sea (ΦST = 0.065). A moderate reduction in genetic diversity for both mtDNA and microsatellites in the Yellow Sea likely reflects founder effects during the last colonization of this sea. Reciprocal monophyly between divergent mtDNA lineages (ΦST = 0.391) across the Alaska Peninsula defines the discontinuity across the North Pacific. However, microsatellites did not show a strong break, as eastern Bering Sea (EBS) herring were more closely related to NE Pacific than to NW Pacific herring. This discordance between mtDNA and microsatellites may be due to microsatellite allelic convergence or to sex-biased dispersal across the secondary contact zone. The sharp discontinuity between Pacific herring populations may be maintained by high-density blocking, competitive exclusion or hybrid inferiority.

Similar Items