Cranial ontogenetic variability, sex ratio and age structure of the Red fox

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Abstract

Describing the sex ratio, age structure of the population and ontogenetic variability of Red fox, Vulpes vulpes (Canidae, Carnivora) skull parameters, this study is based on 416 male and 289 female skulls collected in the Czech Republic. The skulls analysed came from feral individuals, that were shot by hunters. The male to female ratio was 1:0.69 regarding the whole population. Individuals younger than one year prevailed in the population (54% males, 48% females were in their first year of life). Four growth patterns of skull dimensions were described. The first group included mainly skull length dimensions (e.g. condylobasal length). They grew rapidly until the sixth month of life, becoming stabilised afterwards. The second group comprised parameters that were stable throughout the life (e.g. cheek tooth rows). Measurements representing the third growth pattern showed continual growth (mainly width dimensions, e.g. zygomatic breadth). Conversely, smaller dimensions of postorbital breadth were observed after the sixth month of life. Postorbital breadth represented the fourth growth pattern. It was concluded, that male and female Red foxes had similar ontogenetic skull development, even though there were some differences, e. g. in jugular breadth, which increased after the age of six months in males unlike in females. © 2010 Versita Warsaw and Springer-Verlag Wien.

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Hartová-Nentvichová, M., Anděra, M., & Hart, V. (2010). Cranial ontogenetic variability, sex ratio and age structure of the Red fox. Central European Journal of Biology, 5(6), 894–907. https://doi.org/10.2478/s11535-010-0093-2

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