Inferring the geographic mode of speciation by contrasting autosomal and sex-linked genetic diversity.
Mol Biol Evol
; 30(11): 2519-30, 2013 Nov.
Article
en En
| MEDLINE
| ID: mdl-23955517
ABSTRACT
When geographic isolation drives speciation, concurrent termination of gene flow among genomic regions will occur immediately after the formation of the barrier between diverging populations. Alternatively, if speciation is driven by ecologically divergent selection, gene flow of selectively neutral genomic regions may go on between diverging populations until the completion of reproductive isolation. It may also lead to an unsynchronized termination of gene flow between genomic regions with different roles in the speciation process. Here, we developed a novel Approximate Bayesian Computation pipeline to infer the geographic mode of speciation by testing for a lack of postdivergence gene flow and a concurrent termination of gene flow in autosomal and sex-linked markers jointly. We applied this approach to infer the geographic mode of speciation for two allopatric highland rosefinches, the vinaceous rosefinch Carpodacus vinaceus and the Taiwan rosefinch C. formosanus from DNA polymorphisms of both autosomal and Z-linked loci. Our results suggest that the two rosefinch species diverged allopatrically approximately 0.5 Ma. Our approach allowed us further to infer that female effective population sizes are about five times larger than those of males, an estimate potentially useful when comparing the intensity of sexual selection across species.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Cromosomas Sexuales
/
Variación Genética
/
Pinzones
/
Especiación Genética
Tipo de estudio:
Prognostic_studies
Límite:
Animals
Idioma:
En
Año:
2013
Tipo del documento:
Article