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In large mammalian herbivores, the increase of group size with habitat openness was first assumed to be an adaptive response, encoded in the individual. However, it could, alternatively, be an emergent property: if groups were nonpermanent units, often fusing and splitting up, then any increase of the distance at which animals perceive one another could(More)
The effect of experimental manipulation of population density on home-range size was investigated in two free-ranging roe deer (Capreolus capreolus) populations under contrasting environmental conditions. In these two long-term monitoring studies, one in Bogesund, Sweden (12 years) and one in Dourdan, France (10 years), deer density varied fourfold through(More)
Dispersal is a key process in metapopulation dynamics as it conditions species' spatial responses to gradients of abiotic and biotic conditions and triggers individual and gene flows. In the numerous plants that are dispersed through seed consumption by herbivores (endozoochory), the distance and effectiveness of dispersal is determined by the combined(More)
In March 2002, ten roe deer (Capreolus capreolus) were released in a partly wooded 14.2-ha enclosure to investigate the effect of high population density on vegetation cover and demographic parameters. However, in mid 2003, five animals died after rapid emaciation. Two other deer were killed to carry out further post-mortem examination. In addition to a(More)
Die Anzahl der durch den Straßenverkehr verursachten Wildverluste wurde für eine unbejagte Rehwildpopulation erhoben. Der Rehwildbestand wurde jährlich berechnet, die Tiere markiert und durch Telemetrie von 1980 bis 1985 verfolgt. 49 Verkehrsopfer konnten registriert werden. Die männlichen Tiere waren häufiger als die weiblichen derartigen Unfällen(More)
Because of the inaccuracies and biases of population estimates for large herbivores, ‘indicators of ecological change’ (IEC), which allow changes in the animals’ abundance and body condition to be monitored together with ecosystem features, represent an interesting alternative. We used a set of indicators to monitor the relationship between a roe deer(More)
We studied over 1 year the spatial organization and the spatial distribution of activities in a captive springbok (Antidorcas marsupialis) population living in an 18-ha enclosure located in southern France. Throughout the study period, the two adult males occupied fairly exclusive home ranges, in the overlapping part of which the three subadult males were(More)
We studied the ranging behaviour and spatial relationships between seven roe deer during more than 4 years in a partly wooded 14.2-ha enclosure. The animals (three young males, four adult females) were monitored with GPS telemetry collars. As expected, the surface area and overlap of the males' bimonthly ranges decreased, and the distance between their(More)
The beira (Dorcatragus megalotis) is a threatened antelope of the Horn of Africa, whose feeding habits are poorly documented. Using micro-histological analysis of faeces, we examined its wet season diet in arid hills of the Republic of Djibouti and compared it to that of sympatric domestic goats (Capra hircus). As expected, the goat was found to be an(More)
In fulfilling their daily activities, animals must expend the least amount of energy possible while feeding in order to optimise their energy balance. Food is removed by congeners as a result of exploitation competition. When a resource becomes limited, an increase in the probability of interference competition (direct competition for the resource) is(More)
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