title: A hybrid zone with coincident clines for autosomal and sex-specific markers in the Sorex araneus group.
abstract: In hybrid zones, endogenous counter-selection of hybrids is usually first expressed as reduced fertility or viability in hybrids of the heterogametic sex, a mechanism known as Haldane's rule. This phenomenon often leads to a differential of gene flow between sex-linked markers. Here, we address the possibility of a differential gene flow for Y chromosome, mtDNA and autosomal markers across the hybrid zone between the genetically and chromosomally well-differentiated species Sorex antinorii and Sorex araneus race Vaud. Intermarker comparison clearly revealed coincidental centre and very abrupt clines for all three types of markers. The overall level of genetic differentiation between the two species must be strong enough to hinder asymmetric introgression. Cyto-nuclear mismatches were also observed in the centre of hybrid zone. The significantly lower number of mismatches observed in males than in females possibly results from Y chromosome-mtDNA interactions. Results are compared with those previously reported in another hybrid zone between S. antinori and S. araneus race Cordon.
authors: Department of Ecology and Evolution, Biology Building, University of Lausanne, Lausanne, Switzerland. glenn.yannic@gmail.com
authors: G
authors: G
authors: Yannic
authors: P
authors: P
authors: Basset
authors: J
authors: J
authors: Hausser
mesh_terms: D000818:Animals; D004272:DNA, Mitochondrial / Q000235:genetics; D005260:Female; D051456:Gene Flow / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics*; D049810:Genetic Speciation; D006824:Hybridization, Genetic; D007621:Karyotyping; D008297:Male; D012641:Selection, Genetic; D012727:Sex Characteristics; D012788:Shrews / Q000145:classification* / Q000235:genetics*; D014998:Y Chromosome / Q000235:genetics
chemical_list: D004272:DNA, Mitochondrial; D005819:Genetic Markers