Postglacial recolonization of the Valais (Switzerland) by the shrew <i>Sorex antinorii: </i>is dispersal sex-biased? A preliminary study

Fivaz, Fabien; Basset, Patrick; Lugon-Moulin, Nicolas; Hausser, Jacques

doi:10.1515/mamm.2003.67.2.253

Cited by 9 publications

(8 citation statements)

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“…Contrary to Searle's study, our results, suggest that in the Massif of Śnieżnik, females disperse more than males. A similar observation was reported by Fivaz et al (2003) who studied postglacial recolonization of the Valais by the Sorex antinorii . The analysis of the Y‐chromosome microsatellite showed a nearly complete absence of male gene flow between populations from the Simplon Pass and the St. Bernard Pass.…”

Section: Discussionsupporting

confidence: 85%

Genetic structuring of the common shrew,Sorex araneus(Soricomorpha: Soricidae) in the Polish Sudetes may suggest ways of northwards colonization

et al. 2012

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An effect of geographical barriers on the level of population structuring and ways of northwards colonization in the common shrew Sorex araneus was investigated by contrasting gene flow inferred by one Y‐linked and eight autosomal microsatellites. A total of 102 shrews trapped at eight localities separated by mountain ridges of the Śnieżnik Massif (East Sudetes, Poland) were studied. The genetic structure of populations was estimated using the standard analysis of molecular variance based on F‐statistic, as well as two clustering methods implemented in Structure and Geneland. In pair‐wise population comparisons both FST and RST were estimated. A Mantel‐test was used to investigate the patterns and causes of structuring. No significant correlation between genetic differentiation and geographical distance was found for autosomal loci and for the Y‐linked locus. Significant genetic structuring was found in four out of six pairs of populations. Studying autosomal loci we found nonsignificant correlations between pair‐wise matrices of FST and RST and the presence of the barrier. On the other hand, for the Y‐linked locus these correlations were significant, both for FST and RST, suggesting reduced gene flow between populations for males. Patterns of genetic structuring in the common shrew of the Massif of Śnieżnik may suggest two possible ways of northwards colonization, which promoted genetic distinction of shrews migrating different routes.

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Section: Discussionsupporting

confidence: 85%

Genetic structuring of the common shrew,Sorex araneus(Soricomorpha: Soricidae) in the Polish Sudetes may suggest ways of northwards colonization

et al. 2012

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“…This geographical subdivision confirmed the possible presence of at least two different recolonization routes (i.e. Simplon and St‐Bernard pass) of S. antinorii from the Italian peninsula, as postulated by Lugon‐Moulin & Hausser (2002) and Fivaz et al . (2003).…”

Section: Discussionsupporting

confidence: 76%

Genetic and karyotypic structure in the shrews of the Sorex araneus group: are they independent?

Basset¹,

Yannic²,

Hausser³

2006

Molecular Ecology

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The species of the common shrew (Sorex araneus) group are morphologically very similar but exhibit high levels of karyotypic variation. Here we used genetic variation at 10 microsatellite markers in a data set of 212 individuals mostly sampled in the western Alps and composed of five karyotypic taxa (Sorex coronatus, Sorex antinorii and the S. araneus chromosome races Cordon, Bretolet and Vaud) to investigate the concordance between genetic and karyotypic structure. Bayesian analysis confirmed the taxonomic status of the three sampled species since individuals consistently grouped according to their taxonomical status. However, introgression can still be detected between S. antinorii and the race Cordon of S. araneus. This observation is consistent with the expected low karyotypic complexity of hybrids between these two taxa. Geographically based cryptic substructure was discovered within S. antinorii, a pattern consistent with the different postglaciation recolonization routes of this species. Additionally, we detected two genetic groups within S. araneus notwithstanding the presence of three chromosome races. This pattern can be explained by the probable hybrid status of the Bretolet race but also suggests a relatively low impact of chromosomal differences on genetic structure compared to historical factors. Finally, we propose that the current data set (available at http://www.unil.ch/dee/page7010_en.html#1) could be used as a reference by those wanting to identify Sorex individuals sampled in the western Alps.

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“…Our results contradict the female-biased dispersal hypothesis proposed by Fivaz et al (2003). This hypothesis was based upon preliminary observations of genetic variation at mtDNA and Y chromosome based on a partial sampling scheme that mixed individuals from the West and East clades, which indeed suggested that more divergence was to be found on Y chromosome versus mtDNA data (although this difference was not statistically tested).…”

Section: Scale-specific Sex-biased Dispersalcontrasting

confidence: 98%

“…To this end, we completed and reanalyzed data from autosomal microsatellite markers, a polymorphic Y‐linked microsatellite marker, and a highly variable mtDNA control region previously used for phylogeographic inferences (Lugon‐Moulin and Hausser 2002; Yannic et al 2008b) in a small mammal, the Valais shrew Sorex antinorii . A pattern of female‐biased dispersal (unusual among mammals, Greenwood 1980; Lawson Handley and Perrin 2007) was previously suggested for this species (Fivaz et al 2003). However, this hypothesis was based upon genetic variation for a mixture of individuals from distinct clades that were later identified (Fig.…”

supporting

confidence: 56%

Scale-Specific Sex-Biased Dispersal in the Valais Shrew Unveiled by Genetic Variation on the Y Chromosome, Autosomes, and Mitochondrial Dna

et al. 2012

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We investigated sex specificities in the evolutionary processes shaping Y chromosome, autosomes, and mitochondrial DNA patterns of genetic structure in the Valais shrew (Sorex antinorii), a mountain dwelling species with a hierarchical distribution. Both hierarchical analyses of variance and isolation-by-distance analyses revealed patterns of population structure that were not consistent across maternal, paternal, and biparentally inherited markers. Differentiation on a Y microsatellite was lower than expected from the comparison with autosomal microsatellites and mtDNA, and it was mostly due to genetic variance among populations within valleys, whereas the opposite was observed on other markers. In addition, there was no pattern of isolation by distance for the Y, whereas there was strong isolation by distance on mtDNA and autosomes. We use a hierarchical island model of coancestry dynamics to discuss the relative roles of the microevolutionary forces that may induce such patterns. We conclude that sex-biased dispersal is the most important driver of the observed genetic structure, but with an intriguing twist: it seems that dispersal is strongly male biased at large spatial scale, whereas it is mildly biased in favor of females at local scale. These results add to recent reports of scale-specific sex-biased dispersal patterns, and emphasize the usefulness of the Y chromosome in conjunction with mtDNA and autosomes to infer sex specificities.

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Postglacial recolonization of the Valais (Switzerland) by the shrew Sorex antinorii: is dispersal sex-biased? A preliminary study

Cited by 9 publications

References 0 publications

Genetic structuring of the common shrew,Sorex araneus(Soricomorpha: Soricidae) in the Polish Sudetes may suggest ways of northwards colonization

Genetic structuring of the common shrew,Sorex araneus(Soricomorpha: Soricidae) in the Polish Sudetes may suggest ways of northwards colonization

Genetic and karyotypic structure in the shrews of the Sorex araneus group: are they independent?

Scale-Specific Sex-Biased Dispersal in the Valais Shrew Unveiled by Genetic Variation on the Y Chromosome, Autosomes, and Mitochondrial Dna

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