Time filter

Source Type

Guillemain M.,Office National de la Chasse et de la Faune Sauvage
Wildlife Biology | Year: 2010

Many ringing programmes rely heavily on rings returned by hunters, yet the motivation of hunters to participate in such schemes has not so far been examined. A questionnaire survey was launched while French hunters reported hunted teal Anas crecca rings. The main aim was to quantify the proportion of rings returned by different means, to ask hunters about their previous knowledge of the ringing programme and about their motivation to report rings. Hunters reporting rings exhibited altruistic behaviour, sending their data with little knowledge of what they will be used for, and indicated their willingness to help research as their main motivation. They showed little interest in an internet-based ring return system or internet information, but relied mostly on a phone-reporting system when the phone number was indicated on nasal saddles (although the sole presence of a nasal saddle in addition to a metal ring also likely improved the reporting rate of such marked birds). Considering these sociological aspects in the advertisement of ringing programmes may help improve ring recovery rates of quarry species. © 2010 Wildlife Biology, NKV.

From 1994 to 2009, 7,816 dead birds belonging to 92 species were sampled on roads in Atlantic France mainly in the Vendée region. Barn Owl, Common Moorlien, Blackbird and House Sparrow were the most involved species. The highest mortality rate was found in June and December and the lowest In April-May and July-August. More of 50% of the corpses have been found along hedge-lined roads. The influence of weather conditions on road mortality is difficult to assess, except for a few species (Robin, Thrushes, Chaffinch) whose mortality was higher during cold spells. About 55% of birds were killed during day-time. We tried to estimate the annual road mortality in birds for the whole of France by using three approaches. Thus it is likely that at least some 30 millions of birds are killed each year by road traffic in France. Besides predation by cats, road traffic may be considered as the second most important non-natural cause of bird mortality in that country.

During the first half of February 2012 a severe and sudden cold spell occurred in France. Surveys by car and by walking (mainly in the Vendée region in West France) allowed to determine the number of dead birds found to amount 1,300-1,700 individuals/100km. These birds died either by collision with cars or by starvation or contacts with salt spread on roads. The Northern Lapwing was the main species involved (1,200-1,500 individuals/100km) followed by Common Blackbird, Song Thrush and Redwing. A very high mortality of some raptors was also observed.

Benoist S.,Center National Detudes Et Of Recherche Appliquee Sur La Faune Of Montagne | Garel M.,Center National Detudes Et Of Recherche Appliquee Sur La Faune Of Montagne | Cugnasse J.-M.,Office National de la Chasse et de la Faune Sauvage | Blanchard P.,CNRS Biological Evolution and Diversity Laboratory
PLoS ONE | Year: 2013

In prey species, vigilance is an important part of the decision making process related to predation risk effects. Therefore, understanding the mechanisms shaping vigilance behavior provides relevant insights on factors influencing individual fitness. We investigated the role of extrinsic and intrinsic factors on vigilance behavior in Mediterranean mouflon (Ovis gmelini musimon6Ovis sp.) in a study site spatially and temporally contrasted in human pressures. Both sexes were less vigilant in the wildlife reserve compared to surrounding unprotected areas, except for males during the hunting period. During this period, males tended to be less strictly restricted to the reserve than females what might lead to a pervasive effect of hunting within the protected area, resulting in an increase in male vigilance. It might also be a rutting effect that did not occur in unprotected areas because males vigilance was already maximal in response to human disturbances. In both sexes, yearlings were less vigilant than adults, probably because they traded off vigilance for learning and energy acquisition and/or because they relied on adult experience present in the group. Similarly, non-reproductive females benefited of the vigilance effort provided by reproductive females when belonging to the same group. However, in the absence of reproductive females, non-reproductive females were as vigilant as reproductive females. Increasing group size was only found to reduce vigilance in females (up to 17.5%), not in males. We also showed sex-specific responses to habitat characteristics. Females increased their vigilance when habitat visibility decreased (up to 13.8%) whereas males increased their vigilance when feeding on low quality sites, i.e., when concomitant increase in chewing time can be devoted to vigilance with limited costs. Our global approach was able to disentangle the sex-specific sources of variation in mouflon vigilance and stressed the importance of reserves in managing and conserving wild sheep populations. © 2013 Benoist et al.

Broyer J.,Office National de la Chasse et de la Faune Sauvage
Bird Study | Year: 2011

Capsule Mowing postponement in 25% of a meadow system may lead to improved but instable population dynamics in meadow birds. Aim To monitor the long-term effects of mowing postponement on the abundance and territory density of meadow passerines in 25% of a 3000-ha hay-meadow area in the Saone Valley (eastern France). Methods From 1993 to 2009, passerine abundance was measured annually in 78 plots using point counts and territory density was assessed in two study areas by Territory Mapping. Results The programme of mowing postponement led to substantially increased passerine abundance and territory density, with the highest increase detected in Whinchats Saxicola rubetra. No positive trend was observed in Corn Buntings Emberiza calandra. Immediately after the increase in abundance, bird distribution within the study area was not influenced by the timing of mowing. The hatching success, assessed by the systematic observation of food carrying, was negatively influenced by early mowing (40% recorded when 60% of the meadow area was already harvested on 1 July) or, in late mown areas, by high meadow passerine territory density (40% when territory density was 10 per 10 ha). Hatching rate was usually higher in Whinchats than in Corn Buntings. Conclusion By improving meadow passerine breeding outputs and density, mowing postponement led to instable population dynamics with dominance of certain species and density-dependent breeding success. © 2011 British Trust for Ornithology.

Discover hidden collaborations