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1

Reproductive and demographic parameters in two Iberian wild boar Sus scrofa populations

100%
Herrero J., Garcia-Serrano A., Garcia-Gonzales R.
Acta Theriologica
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2008
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tom 53
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nr 4
From 1990 to 2006, we studied the demographic, reproductive, and biometric characteristics of two Iberian wild boarSus scrofa (Linnaeus, 1758) populations in contrasting environments. In the Pyrenees (studied in 1990–1993), forest cover is high, hunting pressure is low, and the density of wild boar is high. In the Ebro Valley (studied in 1994–2006), there are few shelter areas for boars, hunting pressure is high, and density is very low. In the second semester of life and after two years of age, the sows in Ebro Valley were heavier than were those in the Pyrenees. Pregnancy during the first year of life was frequent in the Ebro Valley and rare in the Pyrenees. Litter sizes, ovulation rates, and intrauterine mortalities did not differ significantly between the two populations, but the foetal sex ratio in the Ebro Valley was skewed significantly towards males. Life expectancy was lower in the Ebro Valley (6 yr) than it was in the Pyrenees (10 yr). In the Ebro Valley 75% of the wild boar were >24 months old, whereas in the Pyrenees, the proportion was 59%. We suggest that shelter availability influenced the growth, productivity, hunting pressure, and life expectancy in the two Iberian populations of wild boar.
2

Evidence of non-hibernation in Cantabrian brown bears

76%
Nores C., Ballesteros F., Blanco J. C., Garcia-Serrano A., Herrero J., Palomero G.
Acta Theriologica
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2010
|
tom 55
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nr 3
203-209
Evidence of non-hibernation in brown bears Ursus arctos Linnaeus, 1758 on the Iberian Peninsula has existed since the Middle Ages. We systematically monitored brown bears in the Cantabrian Mountains (Northern Spain) by recording tracks and sightings from 1998 to 2007 to document hibernation behaviour. Our results indicate that females with yearlings and solitary yearlings were more active in winter than bears over two years old. Intensive snow tracking and direct observations of five family groups indicated that they travelled, fed and defecated in winter, which are activities not compatible with the physiological state of hibernation. Also, based on tracking data, the maximum period between two consecutive locations of active family groups in winter was less than that needed by bears to emerge from a state of hibernation (6 days). We conclude that the family groups which we monitored in winter did not hibernate.
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