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1

Colour variation in the common hamster Cricetus cricetus in the north-eastern foot-hills of the Harz Mountains

100%
Kayser A., Stubbe M.
Acta Theriologica
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2000
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tom 45
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nr 3
We investigated the occurrence of colour variations in the common hamster Cricetus cricetus (Linnaeus, 1758) between 1915 and 1980 in the north-eastern foot-hills of the Harz Mountains in Saxony-Anhalt. Material was collected by a professional hamster trapper. The most frequent colour variants were white hamsters followed by piebald and yellow animals. The occurrence of colour morphs was strongly male biased. Only one black hamster, probably an atypical melanistic form, was found in the entire sample of 73 657 hamsters. Overall the percentage of variant individuals was 0.0855%. The frequency decreased significantly over the observed period. Investigations during the 1990s in a neighbouring area showed no colour variation in a smaller sample set. A possible connection between the decline in hamster numbers during this period in the study area and the reduced frequency of colour morphs is discussed.
2

Identification of the barrier to gene flow between phylogeographic lineages of the common hamster Cricetus cricetus

84%
Banaszek A., Ziomek J., Jadwiszczak K. A., Kaczynska E., Mirski P.
Acta Theriologica
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2012
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tom 57
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nr 3
In anthropogenically disturbed habitats, natural barriers still exist and have to be recognized, as they are important for conservation measures. Areas of phylogeographic breaks within a species are often stabilized in inhospitable regions which act as natural barriers. An area of contact between phylogeographic lineages of the common hamster (Cricetus cricetus) was found in the Małopolska Upland in Poland. A total of 142 common hamsters were captured between 2005 and 2009. All hamsters were genotyped at 17 microsatellite loci and partial sequences of the mitochondrial (mtDNA) control region were obtained. No mixed populations with mtDNA haplotypes of both lineages were found. The distance between marginal populations was about 20 km; no hamsters were found in the area between. A principal components analysis (PCA) was performed on microsatellite data and the greatest change in PC1 scores was found between marginal samples. To define the habitat components responsible for the phylogeographic break, we compared the habitat composition of sites occupied by hamsters with those from which hamsters were absent. We found that hamsters avoided forested areas and sandy soils. The area of the potential barrier was characterized by a high proportion of woodland and unfavorable soils in comparison with neighboring areas inhabited by hamsters. They cannot settle in this area due to their high winter mortality in shallow burrows and high predation in the fields adjacent to forests.
3

Mortality factors of the common hamster Cricetus cricetus at two sites in Germany

84%
Kayser A., Weinhold U., Stubbe M.
Acta Theriologica
|
2003
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tom 48
|
nr 1
The mortality of the common hamster Cricetus cricetus (Linnaeus, 1758) was analysed in two regions of Germany. Samples of radio tagged individuals and carcasses found in the field during monitoring procedures were compared. Predation and winter mortality were the main mortality factors, followed by disease and death caused by agricultural machinery during the harvest or other management measures. The causes of mortality differed in the two regions, due to different environmental and ecological parameters, including field size, crops, presence of predators, and agricultural management. The main mortality factors were all directly or indirectly linked to agriculture. Present agricultural management exacerbates predation and increases winter mortality in this species. Crops with a prolonged vegetation cover and food supply are crucial for the survival of common hamsters on farmland with intense agricultural management.
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