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1

Karyotypic variation between wood mouse species: banded chromosomes of Apodemus alpicola and A. microps

100%
Reutter B. A., Nova P., Vogel P., Zima J.
Acta Theriologica
|
2001
|
tom 46
|
nr 4
353-362
The banding pattern (G-, C-, AgNOR-staining) was described in karyotypes of Apodemus alpicola Heinrich, 1952 and A. microps Kratochvil et Rosicky, 1952 collected from the Alps and central Europe. Distinct differences between the two species were revealed in the distribution of C-heterochromatic regions in autosomes and the sex chromosomes, and the distribution of nucleolar organizer regions (NORs). Extensive variation in the distribution pattern of C-heterochromatin and NORs obviously exists among the wood mice of the subgenus Sylvaemus, and individual species can be distinguished according to a specific variation pattern. However, it seems premature to designate individual karyotypic forms as separate species, because the extent of overall geographical interpopulation variation is still not sufficiently known.
2

Range expansion of the greater white-toothed shrew Crocidura russula in Switzerland results in local extinction of the bicoloured white-toothed shrew C.leucodon

100%
Vogel P., Jutzeler S., Rulence B., Reutter B. A.
Acta Theriologica
|
2002
|
tom 47
|
nr 1
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.
3

Discriminant analysis of skull morphometric characters in Apodemus sylvaticus, A.flavicollis, and A.alpicola [Mammalia: Rodentia] from the Alps

100%
Reutter B. A., Hausser J., Vogel P.
Acta Theriologica
|
1999
|
tom 44
|
nr 3
A total of 108 Apodemus skulls from Switzerland, Austria, Italy, France and Germany was studied to determine morphological characteristics useful in identifying individuals as Apodemus syluaticus (Linnaeus, 1758), A. flavicollis (Melchior, 1834) or A. alpicola Heinrich, 1952. The original assignment of the samples to the three species was based on molar cusp morphology, body proportions, pelage coloration, and allozyme analysis. The 24 measured crania! characters used together accurately discriminated between the three species and correctly classified 100% of the individuals to species. A stepwise discriminant function analysis showed that 6 cranial characters are sufficient to differentiate between the three species, with a correct classification above 97%. Fisher's linear discriminant function coefficients can be used directly for classification of unknown specimens.
4

New Sorex araneus karyotypes from Germany and the postglacial recolonization of Central Europe

88%
Brunner H., Turni H., Kapischke H. J., Stubbe M., Vogel P.
Acta Theriologica
|
2002
|
tom 47
|
nr 3
New G-banded karyotypes from populations of the common shrew Sorex araneus Linnaeus, 1758 provide a clearer picture of the distribution of chromosome races in central Europe. As expected according to their occurrence in neighbouring countries, the Jutland (kq, no), Laska (k/o) and Drnholec (ko, nr) races are also found in Germany. A new chromosome race "Rügen" (kq) is described from this Baltic Island. Together with the previously recorded races Ulm and Mooswald (kr), six chromosome races are now known from Germany. The resulting distribution pattern is characterized by high frequencies of different race-specific metacentrics at the periphery of the country and clines with decreasing frequencies towards the centre which is occupied by the Ulm race. This race is acrocentric for all chromosome arms involved in the observed race-specific fusions and represents a buffer between the surrounding, more metacentric races. According to the present distribution of these metacentrics, a scenario for the postglacial recolonization of central Europe by S. araneus populations on three different routes is proposed: from the east along the northern slopes of the Carpathian Arc, from the south-east along the Danube Valley and from the south-west through the Upper Rhine Valley.
5

Habitat, morphology and karyotype of the Saharan shrew Crocidura tarfayaensis [Mammalia: Soricidae]

76%
Vogel P., Mehmeti A. M., Dubey S., Vogel-Gerber C., Koyasu K., Ribi M.
Acta Theriologica
|
2006
|
tom 51
|
nr 4
353-361
The Saharan shrewCrocidura tarfayaensis Vesmanis and Vesmanis, 1980, has a limited disribution along the Atlantic coast of Sahara, south of Agadir (Morocco) through Western Sahara into Mauritania and is only known from few captures and some owl pellets. Here we report field data from the successful trapping of five specimens ofC. tarfayaensis in the Guelmim region. The habitat was characterized by sand dunes along a river, with dense shrubberies ofTamarix sp., the huge grassErianthus ravennae (Poaceae) and flat bushes of Atriplex glauca var. ifniensis (Chenopodiaceae). Morphological discrimination withC. whitakeri were examined. The chromosomes ofC. tarfayaensis revealed a karyotype of 2n = 36, similar to that of the Canary shrewC. canariensis and the Sicilian shrewC. sicula. In conclusion,C. tarfayaensis seems to be a descendant of the presumed continental ancestor of the two island species.
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