. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Geographie variation in the snow vole 135. Fig. 12: Summary of the geographic variation among 13 samples of the snow vole from Aus- tria and Yugoslavia. Distribution of colour morphotypes is designated by closed (dark mor- photype) vs. open circles (pale morphotype). Half closed circles indicate intermediate mor- photypes. Samples are connected by a Gabriel network and the phenetic distances from the plot projections of samples onto the first two pricipal components
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Geographie variation in the snow vole 135. Fig. 12: Summary of the geographic variation among 13 samples of the snow vole from Aus- tria and Yugoslavia. Distribution of colour morphotypes is designated by closed (dark mor- photype) vs. open circles (pale morphotype). Half closed circles indicate intermediate mor- photypes. Samples are connected by a Gabriel network and the phenetic distances from the plot projections of samples onto the first two pricipal components are given for the contigu- ous samples. Some characteristic dental morphotypes are denoted. There are two main causes of geographic variations in animals, namely the limita- tions of the gene ñow between spatially separated populations and the response of an organism to different environments (Lane & Marshall 1981). Thirteen geographic samples elaborated in this study are separated by habitats unsuitable for them. Since no gene flow can be expected, each population should be regarded as a separate evolutionary entity. It has been suggested that the snow vole is a petricolic ani- mal, adapted to cavernicolous habitats (Krystufek & Kovacic 1989). Such a habitat is characterized by stable, mainly stenothermal conditions. Consequently, the homeostatic stability of the morphotype would be expected in the samples studied. However, nearly all studied characters were variable in the 13 samples, and the colour and two skull dimensions showed chnal variability. In the case of colour the humidi-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
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