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Morphometric and allozyme variation in Central and Southern Greek populations of Microtus [Terricola] thomasi

100%

Tsekoura N., Fraguedakis-Tsolis S., Chondropoulos B., Markakis G.

Acta Theriologica

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2002

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tom 47

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nr 2

The endemic Balkan vole taxon Microtus (Terricola) thomasi (Barrett-Hamilton, 1903) exhibits great karyological variability in Greece. In this study, populations belonging to two different karyotypic forms ('atticus' and 'thomasi') are examined both morphometrically and electrophoretically. A total of 140 individuals of M. (T.) thomasi were collected from 6 localities of south and central Greece. For the morphometric analysis, 27 variables (external body and cranial characters) were examined and evaluated according to multivariate analyses (PCA, MANOVA, CVA and CLUS). For the electrophoretic analysis, 18 putative genetic loci were examined and the allozymic data were treated by the biostatistical package BIOSYS-1. According to the results obtained, all the populations studied show little overall morphometric variability, whereas they are characterized by high electrophoretic variability. The populations studied are not grouped according to the karyotypic form. In almost all the cases, in the two UPGMA-dendrograms plotted according to morphometric and electrophoretic distances (Mahalanobis' and Nei's distances, respectively), the populations branching together belong to different karyotypic forms. Conclusively, the morphometric and electrophoretic results of this study revealed that the two karyotypic forms should not be considered separate species or subspecies, as it has been proposed by some authors in the past, and the populations studied can be considered only as different local populations of the rather variable vole species M. (T.) thomasi.

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Allozymic variation in the European polecat Mustela putorius from western France

84%

Lode T.

Acta Theriologica

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1999

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tom 44

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nr 2

Allozymic variation was surveyed in 21 European polecats Mustela putorius Linnaeus, 1758 from western France, using starch gel electrophoresis. Fourteen loci were successfully examined and genetic variation was detected at 28.6% of the loci at the 0.05 level. Heterozygosity level averaged 0.082. European polecats from western France clearly showed significant levels of genetic variability. This result contrasts with previously reported analyses from Danish populations.

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Behavioural and physiological characteristics of standard and chromosomally divergent populations of house mice from the Orkney archipelago [Scotland]

67%

Ganem G.

Acta Theriologica

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1998

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tom 43

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nr 1

House mice Mus musculus domesticus (Schwartz and Schwartz, 1943) from Orkney are closely related on the basis of mandible morphology and allozyme variation. In three of the twenty islands where house mice occur populations have diverged from the standard 2n = 40 karyotype through fixation of Robertsonian (Rb) chromosomal mutations. Mice from Westray island carry 36 chromosomes and share one Rb fusion with those from Eday and Faray (2n = 34; 2n = 34-36). These islands are geographically very close to each other and to islands carrying standard mice. Behavioural and ecophysiological analyses were performed on the three chromosomally divergent populations of mice as well as on two nearby standard populations (Sanday and Papa-Westray). The aim of the study was to assess -whether divergences attributable to chromosomal changes occur, and to discuss whether behavioural divergences may explain the non-mixing of karyotypes. The study does not reveal any divergence between islands attributable to karyotype or habitat differences. The non-blending of the different karyotypes present in Orkney is discussed with reference to history of colonisation, human behaviour, and the consequences of site saturation. Particular characteristics displayed by the different island-populations suggest that in the near future the present pattern of karyotype variation observed in Orkney could change.

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Depauperated gene pools in Marmota m. marmota are caused by an ancient bottleneck: electrophoretic analysis of wild populations from Austria and Switzerland

67%

Preleuthner M., Pinsker W.

Acta Theriologica. Supplement

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1993

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tom 38

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nr 2

Samples from 15 populations of the Alpine marmot Marmota m. marmota (Linnaeus, 1758) were surveyed electrophoretically for allozyme variation. Only 2 out of 50 enzyme loci showed polymorphism. Average heterozygosity was found to be low with 1.2%. No rare alleles were detected among the 8430 genes examined. The geographic variation at the two polymorphic loci (Pep-1 and Sod-1) was analysed in more detail. The distribution pattern of the allele frequencies indicates genetic differentiation between autochthonous and introduced populations. No striking deviations of the genotype distributions from Hardy-Weinberg equilibrium were observed. Thus the population structure is apparently not affected by inbreeding. The obviously diminished genetic variation and the geographic pattern of the allele frequencies at the two variable loci can be best explained by assuming a severe bottleneck in the recent past.

Ograniczanie wyników

3 Acta Theriologica

1 Acta Theriologica. Supplement

1 Chondropoulos B.

1 Fraguedakis-Tsolis S.

1 Ganem G.

1 Lode T.

1 Markakis G.

1 Pinsker W.

1 Preleuthner M.

1 Tsekoura N.

1 2002

1 1999

1 1998

1 1993

Morphometric and allozyme variation in Central and Southern Greek populations of Microtus [Terricola] thomasi

Allozymic variation in the European polecat Mustela putorius from western France

Behavioural and physiological characteristics of standard and chromosomally divergent populations of house mice from the Orkney archipelago [Scotland]

Depauperated gene pools in Marmota m. marmota are caused by an ancient bottleneck: electrophoretic analysis of wild populations from Austria and Switzerland