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Colonization, dispersal, and hybridization influence phylogeography of North Atlantic sea urchins (Strongylocentrotus droebachiensis).
Evolution. 2005 Mar; 59(3):532-43.E

Abstract

We used frequency-based and coalescent-based phylogeographic analysis of sea urchin (Strongylocentrotus droebachiensis) mitochondrial DNA (mtDNA) sequences and previously published microsatellite data to understand the relative influence of colonization and gene flow from older (north Pacific) and younger (northeast Atlantic) sea urchin populations on genetic variation in the northwest Atlantic. We found strong evidence of survival of northwestern Atlantic populations in local Pleistocene glacial refugia: most haplotypes were the same as or closely related to Pacific haplotypes, with deep gene genealogies that reflect divergence times within the northwestern Atlantic that are much older than the last glacial maximum. We detected gene flow across the North Atlantic in the form of haplotypes shared with or recently descended from European populations. We also found evidence of significant introgression of haplotypes from a closely related species (S. pallidus). The relative magnitude of gene flow estimated by coalescent methods (and the effective population size differences among oceanic regions) depended on the genetic marker used. In general, we found very small effective population size in the northeastern Atlantic and high trans-Arctic gene flow between the Pacific and northwestern Atlantic. Both analyses suggested significant back-migration to the Pacific. However, microsatellites more strongly reflected older Pacific migration (with similar effective population sizes across the Arctic), whereas mtDNA sequences appeared to be more sensitive to recent trans- Atlantic dispersal (with larger differences in effective population size). These differences across marker types might have several biological or methodological causes, and they suggest caution in interpretation of the results from a single locus or class of markers.

Authors+Show Affiliations

Addison JA
Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 4J1, Canada. addison@biology.ucsc.edu
Hart MW
No affiliation info available

MeSH

AnimalsAtlantic OceanCluster AnalysisDNA PrimersDNA, MitochondrialDemographyGenetic VariationGenetics, PopulationGeographyHaplotypesHybridization, GeneticLikelihood FunctionsMicrosatellite RepeatsModels, GeneticPhylogenyPopulation DensityPopulation DynamicsSequence Analysis, DNAStrongylocentrotus

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15856696

Citation

Addison, Jason A., and Michael W. Hart. "Colonization, Dispersal, and Hybridization Influence Phylogeography of North Atlantic Sea Urchins (Strongylocentrotus Droebachiensis)." Evolution; International Journal of Organic Evolution, vol. 59, no. 3, 2005, pp. 532-43.
Addison JA, Hart MW. Colonization, dispersal, and hybridization influence phylogeography of North Atlantic sea urchins (Strongylocentrotus droebachiensis). Evolution. 2005;59(3):532-43.
Addison, J. A., & Hart, M. W. (2005). Colonization, dispersal, and hybridization influence phylogeography of North Atlantic sea urchins (Strongylocentrotus droebachiensis). Evolution; International Journal of Organic Evolution, 59(3), 532-43.
Addison JA, Hart MW. Colonization, Dispersal, and Hybridization Influence Phylogeography of North Atlantic Sea Urchins (Strongylocentrotus Droebachiensis). Evolution. 2005;59(3):532-43. PubMed PMID: 15856696.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Colonization, dispersal, and hybridization influence phylogeography of North Atlantic sea urchins (Strongylocentrotus droebachiensis). AU - Addison,Jason A, AU - Hart,Michael W, PY - 2005/4/29/pubmed PY - 2005/5/27/medline PY - 2005/4/29/entrez SP - 532 EP - 43 JF - Evolution; international journal of organic evolution JO - Evolution VL - 59 IS - 3 N2 - We used frequency-based and coalescent-based phylogeographic analysis of sea urchin (Strongylocentrotus droebachiensis) mitochondrial DNA (mtDNA) sequences and previously published microsatellite data to understand the relative influence of colonization and gene flow from older (north Pacific) and younger (northeast Atlantic) sea urchin populations on genetic variation in the northwest Atlantic. We found strong evidence of survival of northwestern Atlantic populations in local Pleistocene glacial refugia: most haplotypes were the same as or closely related to Pacific haplotypes, with deep gene genealogies that reflect divergence times within the northwestern Atlantic that are much older than the last glacial maximum. We detected gene flow across the North Atlantic in the form of haplotypes shared with or recently descended from European populations. We also found evidence of significant introgression of haplotypes from a closely related species (S. pallidus). The relative magnitude of gene flow estimated by coalescent methods (and the effective population size differences among oceanic regions) depended on the genetic marker used. In general, we found very small effective population size in the northeastern Atlantic and high trans-Arctic gene flow between the Pacific and northwestern Atlantic. Both analyses suggested significant back-migration to the Pacific. However, microsatellites more strongly reflected older Pacific migration (with similar effective population sizes across the Arctic), whereas mtDNA sequences appeared to be more sensitive to recent trans- Atlantic dispersal (with larger differences in effective population size). These differences across marker types might have several biological or methodological causes, and they suggest caution in interpretation of the results from a single locus or class of markers. SN - 0014-3820 UR - https://www.unboundmedicine.com/medline/citation/15856696/Colonization_dispersal_and_hybridization_influence_phylogeography_of_North_Atlantic_sea_urchins__Strongylocentrotus_droebachiensis__ DB - PRIME DP - Unbound Medicine ER -