Genetic differentiation of common shrew Sorex araneus populations among different alpine valleys revealed by microsatellites

Lugon-Moulin, Nicolas; Balloux, François; Hausser, Jacques

doi:10.4098/at.arch.00-66

Cited by 29 publications

(28 citation statements)

References 13 publications

(21 reference statements)

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“…This hypothesis is in agreement with the probable routes used by S. antinorii to recolonize the northern part of its home range from southern Italy after the last maximum glaciations (Yannic et al, 2008c). However, short-term Lugon-Moulin et al, 2000). An important difference between the Haslital and Les Houches hybrids zones is the geographical location of the zone.…”

Section: Discussionmentioning

confidence: 99%

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Chromosomal rearrangements and gene flow over time in an inter-specific hybrid zone of the Sorex araneus group

2009

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Most hybrid zones have existed for hundreds or thousands of years but have generally been observed for only a short time period. Studies extending over periods long enough to track evolutionary changes in the zones or assess the ultimate outcome of hybridization are scarce. Here, we describe the evolution over time of the level of genetic isolation between two karyotypically different species of shrews (Sorex araneus and Sorex antinorii) at a hybrid zone located in the Swiss Alps. We first evaluated hybrid zone movement by contrasting patterns of gene flow and changes in cline parameters (centre and width) using 24 microsatellite loci, between two periods separated by 10 years apart. Additionally, we tested the role of chromosomal rearrangements on gene flow by analysing microsatellite loci located on both rearranged and common chromosomes to both species. We did not detect any movement of the hybrid zone during the period analysed, suggesting that the zone is a typical tension zone. However, the gene flow was significantly lower among the rearranged than the common chromosomes for the second period, whereas the difference was only marginally significant for the first period. This further supports the role of chromosomal rearrangements on gene flow between these taxa.

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Section: Discussionmentioning

confidence: 99%

“…Polymerase chain reaction conditions are described elsewhere (Wyttenbach et al, 1997;Balloux et al, 1998;Lugon-Moulin et al, 2000;Basset et al, 2006b, c). All PCR were performed in a 20 ml total volume.…”

Section: Dna Extraction and Microsatellite Genotypingmentioning

confidence: 99%

Chromosomal rearrangements and gene flow over time in an inter-specific hybrid zone of the Sorex araneus group

2009

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“…Polymerase chain reaction (PCR) conditions are described elsewhere (Wyttenbach et al 1997;Balloux et al 1998;Lugon-Moulin et al 2000;Basset et al 2006a,b), except that all PCR amplifications were performed in a 20-l total volume. Cycling was carried out in a PE9700 (Applied Biosystems, Foster City, CA) using the following profile: 95ЊC for 5 min; 35 cycles of 30 s at 94ЊC, 30 s at annealing temperature (Basset et al 2006b), 30 s at 72ЊC; and a final extension at 72ЊC for 4 min.…”

Section: Dna Extraction and Microsatellite Typingmentioning

confidence: 99%

Restricted Gene Flow at Specific Parts of the Shrew Genome in Chromosomal Hybrid Zones

et al. 2006

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Abstract. The species and races of the shrews of the Sorex araneus group exhibit a broad range of chromosomal polymorphisms. European taxa of this group are parapatric and form contact or hybrid zones that span an extraordinary variety of situations, ranging from absolute genetic isolation to almost free gene flow. This variety seems to depend for a large part on the chromosome composition of populations, which are primarily differentiated by various Robertsonian fusions of a subset of acrocentric chromosomes. Previous studies suggested that chromosomal rearrangements play a causative role in the speciation process. In such models, gene flow should be more restricted for markers on chromosomes involved in rearrangements than on chromosomes common in both parent species. In the present study, we address the possibility of such differential gene flow in the context of two genetically very similar but karyotypically different hybrid zones between species of the S. araneus group using microsatellite loci mapped to the chromosome arm level. Interspecific genetic structure across rearranged chromosomes was in general larger than across common chromosomes. However, the difference between the two classes of chromosomes was only significant in the hybrid zone where the complexity of hybrids is expected to be larger. These differences did not distinguish populations within species. Therefore, the rearranged chromosomes appear to affect the reproductive barrier between karyotypic species, although the strength of this effect depends on the complexity of the hybrids produced.

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“…According to Jiggins and Mallet (2000), bimodality is evidence of "a route to speciation" or is a witness of inhibition of gene flow between contacting forms. Also almost all authors show that intra-racial structuring is significant, and sometimes it is greater than interracial structuring (Lugon-Mouline et al, 2000;Ratkievicz et al, 2002;Horn et al, 2012). We suppose that the paradoxical results of estimations with using various kinds of frequency markers versus chromosomal diversity could be explained by a remarkable impediment of gene flow not only between races but also between populations within races.…”

Section: Introductionmentioning

confidence: 87%

“…Also, large molecular variability within races was found in a number of studies (Lugon-Mouline et al, 2000;Ratkiewiz et al, 2002;Andersson, 2004). Both the level of complexity of hybrids and the type of chromosomes had no effect on genetic distance between races, as it was measured with using microsatellite alleles (Horn et al, 2012).…”

Section: Introductionmentioning

confidence: 93%

Intra-species structuring in the common shrew Sorex araneus (Lipotyphla: Soricidae) in European Russia: morphometric variability could give evidence of limitation of interpopulation migration

Щипанов¹,

Voyta²,

Бобрецов³

et al. 2014

Rus.J.Theriol.

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ABSTRACT. The shape of the skull, mandible, and first lower molar (m1) in 10 geographical samples from four chromosomal races of two karyotypic groups were studied using geometric morphometrics. Discriminant analysis with cross-validation was used to test the accuracy of classifications of specimens using skull shape. The percentage of correct classifications attributed to race varied from 61.8% to 89.5% and ranged from 51.6% to 82.3% for geographical samples. The structuring between races, as measured with Q st (this metric is analogous to F st , and the latter is used as a measure of genetic disparity between samples), was less than population-level structuring both within and between races. Variance between karyotypic groups in skull size, mandible, and molar shape was greater than between races. In skull shape, the variance was smaller as compared to the inter-racial level without larger "mountain" samples and greater when the entire set of samples was estimated. Interpopulation differences in all census characteristics were the most prominent. The magnitude of Q st in interpopulation estimations was similar both among populations of the same race and among populations of different races. Lack of correlation of Q st level with geographical distance between samples was found both in size and shape of the skull, mandible, and first lower molar. The significant difference between populations within a race was regarded as evidence of limitation of interpopulation migration. Each pair of geographic samples has a unique set of differentiating features. The stochastic variability of traits between the local samples, irrespective of race, is interpreted as evidence of genetic drift within partly isolated local populations. Diminishing differences between races could be a consequence of reabsorbing those stochastic morphological differences back into the metapopulations. The greater level of phenotypic differentiation between karyotypic groups compared to races is interpreted as a greater amount of time elapsed since the time of common ancestry.

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Genetic differentiation of common shrew Sorex araneus populations among different alpine valleys revealed by microsatellites

Cited by 29 publications

References 13 publications

Chromosomal rearrangements and gene flow over time in an inter-specific hybrid zone of the Sorex araneus group

Chromosomal rearrangements and gene flow over time in an inter-specific hybrid zone of the Sorex araneus group

Restricted Gene Flow at Specific Parts of the Shrew Genome in Chromosomal Hybrid Zones

Intra-species structuring in the common shrew Sorex araneus (Lipotyphla: Soricidae) in European Russia: morphometric variability could give evidence of limitation of interpopulation migration

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