Thèse de doctorat en Ecologie des populations et des Ecosystèmes
Sous la direction de Jean-François Dobremez.
Soutenue en 2005
à Chambéry .
The linked analysis of the plant trophic resources, the spatial use of the study site by ibex and their foraging behaviour have allowed us to display some of key points about the diet habitat selection. It was proved that the mountain vegetation is a very variable trop hic resource, in space and in time. The diet harvests of ibex vary according to this heterogeneity with a pronounced selectivity. Some sub-alpine herbaceous species have a definite trophic significance. Their availability could decrease because of the shrub invasion. Our experimentations of environment closing control provided positive results according to the trophic resource improvement for ibex but also for the domestic sheep. The variations of vegetation resource availability and quality according to elevation and growing season periods are approached. They have a pronounced impact on the ibex habitat use. The foraging behaviours and strategies play an important part in the ibex diet locations during the growing season but also for the resting locations. The results bring out that ibex establish a trade-off between quality and quantity of the trophic resources in preferring (location and diet intake) intermediate stage of growth vegetation (Forage Maturation Hypothesis), in following the green-up. However this strategy is thwarted by many factors according to sexes and periods
Diet habitat of alpine ibex (Capra i. Ibex) during growing season on the Belledonne - Sept laux mountains (Isère, France). Spatio-temporal variations, sexual dimorphism effects and management consequences
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