Wyniki wyszukiwania

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Diet of Sorex coronatus in the western Pyrenees

100%

Castien E., Gosalbez J.

Acta Theriologica

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1995

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tom 40

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nr 2

The diet of Sorex coronatus (Millet, 1828) was studied by the analysis of digestive tracts from 178 individuals collected in Quinto Real Massif, western Pyrenees (north of the Iberian Peninsula). In total, 28 different types of food were determined. The most important prey species, as determined by numerical presence (N) and Simpson's dominance index (D"), were Chilopoda (%N = 12.8; D" = 21.4), Diptera larvae (%N = 22.0; D"= 17.7), Oligochaeta: Opistopora (%N = 11.3; D" = 12.2), Gastropoda (%N = 7.0; D" = 8.7), adult Coleoptera (%N = 6.9; D" = 8.0) and Hemiptera (%N = 6.0; D" = 5.3). Diets of both sexes were similar. The diet of S. coronatus in the study area was similar to the diet of S. araneus described in the literature.

2

The Sorex araneus group in the northern Iberian System Spain: a contact zone between S.coronatus and S.granarius?

100%

Lopez-Fuster M. J., Ventura J., Garcia-Perea R., Gisbert J.

Acta Theriologica

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1999

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tom 44

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nr 2

Available information on the distribution of the European species of the Sorex arañéis group in the Iberian Peninsula suggests that the Iberian System (north-central Spain might be a sympatric area between S. coronatus Millet, 1828 and S. granarius Miller, 1910. With the aim to assess this hypothesis, multivariate analyses based on 16 skull and mandible parameters were carried out on 78 shrews from the Iberian System. A preliminary specific determination was performed on 57 specimens using a discriminant function established in a previous study. Two further discriminant functions based on skull and mandible variables respectively were constructed from the sample analysed and both provided an identical classification of the specimens, although slight.y different from that of the preliminary determination. In order to summarize the n.orphometric interspecific relationships a principal components analysis was performed. Results obtained confirm the presence of S. coronatus and strongly suggest that of S. granarius and of a contact zone between both species in the Iberian System. In this area both species share the same general habitats, occupying oro- and supramedi- terrarean bioclimatic levels. Taking into account the distributional pattern reported for S. araneus and S. coronatus in sympatric areas, and considering the convergence in size observed between S. granarius and S. coronatus in the Iberian System, we suggest that in this contact zone both species might have a parapatric distribution, due most probably to microhabitat segregation.

3

A taxonomical re-evaluation of the Valais chromosome race of the common shrew Sorex araneus [Insectivora: Soricidae]

67%

Brunner H., Lugon-Moulin N., Balloux F., Fumagalli L., Hausser J.

Acta Theriologica

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2002

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tom 47

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nr 3

The common shrew Sorex araneus Linnaeus, 1758 is subject to intense chromosomal polymorphism. About 65 chromosome races are presently known. One of these chromosome races (the Valais race) is karyologically, morphologically, biochemically, and genetically clearly distinct from all other chromosome races of the species. Recent studies of hybrid zones between the Valais race and other chromosome races in the Swiss and French Alps add further strong evidence for the specific taxonomic status of the Valais race. Chromosomes and diagnostic protein markers reveal sharp frequency clines and strong heterozygote deficits. In one hybrid zone, the maintenance of the strong genetic differentiation of the hybridizing taxa was confirmed by a study with autosomal microsatellites indicating minimal gene flow. A microsatellite marker on the Y-chromosome showed complete absence of male mediated gene flow suggesting hybrid male sterility. To clarify the taxonomic status of this taxon, additional analyses were conducted. A morphometric analysis of the mandible indicated the Valais race is morphologically as distinct from neighbouring chromosome races of S. araneus as from other related Sorex species. In a phylogeny based on complete mitochondrial DNA cytochrome b gene sequences, the Valais race clearly appears as the sister taxon to all other races of S. araneus. Therefore, the chromosome race Valais of S. araneus herein is elevated to specific status and the name Sorex antinorii Bonaparte, 1840 is applied.

Ograniczanie wyników

3 Acta Theriologica

1 Balloux F.

1 Brunner H.

1 Castien E.

1 Fumagalli L.

1 Garcia-Perea R.

1 Gisbert J.

1 Gosalbez J.

1 Hausser J.

1 Lopez-Fuster M. J.

1 Lugon-Moulin N.

1 Ventura J.

1 2002

1 1999

1 1995

Diet of Sorex coronatus in the western Pyrenees

The Sorex araneus group in the northern Iberian System Spain: a contact zone between S.coronatus and S.granarius?

A taxonomical re-evaluation of the Valais chromosome race of the common shrew Sorex araneus [Insectivora: Soricidae]