. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 330 M. J. López-Fuster & J. Ventura. Fig. 1: Iberian distribution areas of Sorex granarius ( ), S. coronatus (—) and S. araneus (—. —.—) according to literature. Localities of the specimens analysed as in Table 1. granarius from Sierra de Guadarrama, Sierra de Gredos and Galicia (see Gisbert et al. 1988). Discriminant analyses were carried out on mandibles and skulls from single species locations, using the SPSS-PC + programs (Norusis 1988). Results and discussi
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 330 M. J. López-Fuster & J. Ventura. Fig. 1: Iberian distribution areas of Sorex granarius ( ), S. coronatus (—) and S. araneus (—. —.—) according to literature. Localities of the specimens analysed as in Table 1. granarius from Sierra de Guadarrama, Sierra de Gredos and Galicia (see Gisbert et al. 1988). Discriminant analyses were carried out on mandibles and skulls from single species locations, using the SPSS-PC + programs (Norusis 1988). Results and discussion Basic descriptive statistics of mandible measurements of the Iberian populations of the Sorex araneus-arcticus species group are shown in table 2. Samples were subjected to distance analysis using standardized data to calculate average taxonomic distances. A phenogram of distance relationships among populations was produced by the unweighted pair-group method using arithmetic averages (UPGMA). In the phenogram (Fig. 2) there appeared two main clusters, which represented the eastern large size forms (S. coronatus from Navarra and Guipúzcoa, Huesca, French Pyrenees and Vail d'Aran, and samples of S. araneus) and the western small size forms (S. coronatus from León and Asturias, and samples of S. granarius). The results of the principal component analysis are presented in a three-dimensional diagram (Fig. 3), with the centroid for each sample and a minimum spanning tree, which shows the shortest path connecting all samples. The first three components account for %, % and % of the variation, respectively (Tab. 3). Component I is a size factor, with positive loadings for all variables, whereas component II is highly correlated with y and 8, and to a lesser extent with a and ß. Shrews with large mandibles were located on the right of the diagram, coinciding with the samples that constituted the first main cluster. Within this group, two sub-groups can
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