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1

Garden dormouse (Eliomys quercinus, Linnaeus 1766) without fenestration in angular process

100%
Yuste C. S., Calzada J.
Acta Theriologica
|
2013
|
tom 58
|
nr 3
One of the skull traits that separates the Leithiinae subfamily from other subfamilies of Gliridae family is a prominent fenestration in the angular process of the mandible. There is no reference in the literature of dormice from Leithiinae subfamily without this fenestration. However, some garden dormice (Eliomys quercinus) have been found without this fenestration in Spain. This lack of perforation may be due to an ossification of the angular process related to bone growth. Garden dormice skulls from different parts of Spain kept in two mammal collections were revised in order to detect animals without fenestration and to take measures that differ between young and adult dormice. The measures recorded did not differ between dormice with and without fenestration, and so, the entire angular process is not the result of an ossification process. Thus, the discovery of specimens without fenestration in the angular process should be taken into account in studies which need the identification of this species and other species from Leithiinae subfamily based on skull and mandibles traits.
2

Albino and melanistic genets (Genetta genetta) in Europe

80%
Delibes M., Mezan-Muxart V., Calzada J.
Acta Theriologica
|
2013
|
tom 58
|
nr 1
While melanistic genets (Genetta spp.) are well known in a few species of the genus, albino specimens have not been described to date. Here, we report on the presence of unusual albino and melanistic common genets (Genetta genetta) in Spain, discussing their frequency of occurrence in the wild. Melanistic and albino common genets are not known in the original African range of the species, thus phenotypical variability in coat colour appears to be greater in Europe, its introduced range. Natural (e.g. a reduced risk of predation in Europe) and/or artificial (e.g. captive-rearing of the species) selection could explain this fact, but more research on the topic is needed.
3

Estimating the size of European rabbits consumed by predators: Relationship between body mass and tooth dimensions

80%
Calzada J., Haydon D. T., Palomares F.
Acta Theriologica
|
2003
|
tom 48
|
nr 1
A method for estimating body mass of European rabbitsOryctolagus cuniculus (Linnaeus, 1758) based on tooth dimensions is proposed. Regression models identified significant relationships between the body mass of 87 rabbits and individual tooth length, breadth, product of tooth length and breadth, and whether or not the individual was infected with myxomatosis. Dimensions of 10 of 14 different teeth explained over 80% of variation in body mass, and those teeth were selected as adequate predictors of rabbit body mass. Models were tested using teeth from 16 additional rabbits of known body mass. Body mass, predicted on the basis of 9 of the 10 selected teeth, was statistically indistinguishable from the observed values for all 16 individuals. When myxomatosis infection status of the rabbit was included in the model, all 10 selected teeth yielded predictions statistically indistinguishable from those observed. Prediction errors can be computed permitting statistical comparison of the average predicted value of body mass from different samples of rabbits. The model is useful in estimating rabbit body masses from teeth recovered from feces of predators and it will facilitate testing of hypotheses on size-selective predation. The method was applied to rabbit teeth found in fecal samples from the Iberian lynxLynx pardinus collected over a one-year period. Lynx preyed preferentially upon younger rabbits during the peak breeding period of this lagomorph.
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