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A hybrid zone with coincident clines for autosomal and sex‐specific markers in the Sorex araneus group
Author(s) -
YANNIC G.,
BASSET P.,
HAUSSER J.
Publication year - 2008
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1111/j.1420-9101.2008.01526.x
Subject(s) - sorex , biology , hybrid zone , heterogametic sex , araneus , introgression , hybrid , gene flow , genetics , reproductive isolation , chromosome , evolutionary biology , zoology , gene , genetic variation , population , botany , demography , sociology
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.