Les Petits Mammiferes Terrestres Du Valais Central (Suisse)

Meylan, A

doi:10.1515/mamm.1967.31.2.225

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…Although the presence of S. araneus of the Valais chromosome race was attested in various localities in the Rhône valley (Hausser et al . 1986; Meylan 1967), its presence in the lowlands appears to be localized and rather rare, fitting our genetical analyses.…”

Section: Discussionsupporting

confidence: 84%

Phylogeographical structure, postglacial recolonization and barriers to gene flow in the distinctive Valais chromosome race of the common shrew (Sorex araneus)

Lugon-Moulin

Hausser

2002

Molecular Ecology

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Using one male-inherited and eight biparentally inherited microsatellite markers, we investigate the population genetic structure of the Valais chromosome race of the common shrew (Sorex araneus) in the Central Alps of Europe. Unexpectedly, the Y-chromosome microsatellite suggests nearly complete absence of male gene flow among populations from the St-Bernard and Simplon regions (Switzerland). Autosomal markers also show significant genetic structuring among these two geographical areas. Isolation by distance is significant and possible barriers to gene flow exist in the study area. Two different approaches are used to better understand the geographical patterns and the causes of this structuring. Using a principal component analysis for which testing procedure exists, and partial Mantel tests, we show that the St-Bernard pass does not represent a significant barrier to gene flow although it culminates at 2469 m, close to the highest altitudinal record for this species. Similar results are found for the Simplon pass, indicating that both passes represented potential postglacial recolonization routes into Switzerland from Italian refugia after the last Pleistocene glaciations. In contrast with the weak effect of these mountain passes, the Rhône valley lowlands significantly reduce gene flow in this species. Natural obstacles (the large Rhône river) and unsuitable habitats (dry slopes) are both present in the valley. Moreover, anthropogenic changes to landscape structures are likely to have strongly reduced available habitats for this shrew in the lowlands, thereby promoting genetic differentiation of populations found on opposite sides of the Rhône valley.

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Section: Discussionsupporting

confidence: 84%

Phylogeographical structure, postglacial recolonization and barriers to gene flow in the distinctive Valais chromosome race of the common shrew (Sorex araneus)

Lugon-Moulin

Hausser

2002

Molecular Ecology

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“…The dynamic event occurred in the central Valais, in which Meylan (1967) recorded exclusively C. leucodon (n = 58). In the last 25 years, the contact zone progressed in an upstream direction on the right side of the Rhone about 35 km, on the left side 18 km.…”

Section: Progression Distribution and Competitionmentioning

confidence: 99%

“…A specimen of C. russula collected by Y. Crettenand was killed by a cat at "Mayens de Riddes" at an altitude of 1280 m, showing that this species is also colonising the isolated villages on the slopes. In the Valais, C. leucodon was trapped at 1400 m (Vogel and Vogel-Gerber 1995), but in the region of lake Geneva, C. russula was even observed at 1650 m (Meylan 1967), so in the long term, altitude may not be a limiting factor of the range expansion.…”

Section: Progression Distribution and Competitionmentioning

confidence: 99%

“…Observations of geographic segregation between the resident C. leucodon in the upper Valais and C. russula in the lower Valais (Meylan 1967) led to a small study of the transition zone by our students some 25 years ago. The results suggested a parapatric contact zone situated in the region of Martigny, with an important difference between the limits on the right and left side of the Rhone.…”

Section: Introductionmentioning

confidence: 99%

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Range expansion of the greater white-toothed shrewCrocidura russula in Switzerland results in local extinction of the bicoloured white-toothed shrewC. leucodon

et al. 2002

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2002. Range expansion of the greater white-toothed shrew Crocidura russula in Switzerland results in local extinction of the bicoloured white-toothed shrew C. leucodon. Acta Theriologica 47: 15-24.The distribution limits of Crocidura russula (Hermann, 1780) and C. leucodon (Hermann, 1780) were investigated during an interval of 25 years in the bottom of the Rhone valley above Lake Geneva, Switzerland (total data set: 105 spatio-temporal occurrences, 1137 shrews). In 1975, the contact zone between the two species was situated in the region of Martigny. In 1999/2000, new sampling revealed three results:(1) The contact zone showed an upward shift of about 25 km. (2) In the expanded range of C. russula, the resident species has totally disappeared (confirmed by owl pellets analysis). (3) This demonstrates a dominance of C. russula over C. leucodon. Three hypotheses which may explain the range expansion of C. russula were evaluated:(1) habitat modification favouring linear dispersal due to the construction of a highway;(2) temporal event favoured by climate fluctuations, or (3) ongoing postglacial colonisation of Europe. Hypothesis 1 was rejected, because the progression of the shrews anticipated the construction. Hypothesis 3 received only weak support because range limits of C. russula in the region of Nice have been stable for thousands of years. Therefore hypothesis 2, admitting that ongoing climate change has facilitated range expansion, is the most probable.

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Sur la présence de Crocidura leucodon (Micromammifère) dans le département de l'Indre (France)

Indelicato¹

2018

Annales Scientifiques Du Limousin

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Les Petits Mammiferes Terrestres Du Valais Central (Suisse)

Cited by 3 publications

References 4 publications

Phylogeographical structure, postglacial recolonization and barriers to gene flow in the distinctive Valais chromosome race of the common shrew (Sorex araneus)

Phylogeographical structure, postglacial recolonization and barriers to gene flow in the distinctive Valais chromosome race of the common shrew (Sorex araneus)

Range expansion of the greater white-toothed shrewCrocidura russula in Switzerland results in local extinction of the bicoloured white-toothed shrewC. leucodon

Sur la présence de Crocidura leucodon (Micromammifère) dans le département de l'Indre (France)

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