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PMID: 12702683 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S.

Nuclear gene genealogies reveal historical, demographic and selective factors associated with speciation in field crickets.

Genetics ·Vol. 163 ·No. 4 ·2003-04-00 ·Pages 1389-401

Broughton RE, Harrison RG

Abstract

Population genetics theory predicts that genetic drift should eliminate shared polymorphism, leading to monophyly or exclusivity of populations, when the elapsed time between lineage-splitting events is large relative to effective population size. We examined patterns of nucleotide variation in introns at four nuclear loci to relate processes affecting the history of genes to patterns of divergence among natural populations and species. Ancestral polymorphisms were shared among three recognized species, Gryllus firmus, G. pennsylvanicus, and G. ovisopis, and genealogical patterns suggest that successive speciation events occurred recently and rapidly relative to effective population size. High levels of shared polymorphism among these morphologically, behaviorally, and ecologically distinct species indicate that only a small fraction of the genome needs to become differentiated for speciation to occur. Among the four nuclear gene loci there was a 10-fold range in nucleotide diversity, and patterns of polymorphism and divergence suggest that natural selection has acted to maintain or eliminate variation at some loci. While nuclear gene genealogies may have limited applications in phylogeography or other approaches dependent on population monophyly, they provide important insights into the historical, demographic, and selective forces that shape speciation.

MeSH Terms
Animals Base Sequence Biological Evolution Calmodulin/genetics Cytochromes c/genetics Genetics, Population Glucose-6-Phosphate Isomerase/genetics Gryllidae/genetics Molecular Sequence Data Peptide Elongation Factor 1/genetics Phylogeny Polymorphism, Genetic
Chemicals
Calmodulin Peptide Elongation Factor 1 Cytochromes c Glucose-6-Phosphate Isomerase
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Broughton Richard E
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York 14853, USA. [email protected]
Harrison Richard G
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Article Info
Journal
Genetics
Abbr.
Genetics
ISSN
0016-6731
Published
2003-04-00
Pages
1389-401
Language
English
Region
United States
NLM ID
0374636
PMCID
PMC1462531
Subset
IM
Databases
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