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Devine qui vient dîner … : graines des villes et graines des champs, ou l'impact de l'agriculture péri-urbaine sur les oiseaux des jardins

Abstract : Supplementary feeding of wild birds in private backyards is a globally widespread pastime. It provides a wonderful opportunity for research and survey of winter bird populations at spatial and temporal large-scales by involving householders in citizen science programs. We used data from the French national garden birdwatch scheme, a citizen science program operated by the Ligue de Protection des Oiseaux, to study winter bird abundance variations in gardens which provided food supply, at a large spatial scale. This thesis aims to understand which factors influence the visit of gardens by birds during winter, a season traditionally pointed out to have the greatest impact on passerine survival. We highlighted that gardens with feeders located close to intensively cultivated farmland attract birds as a response of the countryside natural resource scarcity leads by intensive agricultural practices. This relationship being stronger for farmland seedeater species. Variations in the use of garden by birds also fluctuate between years and with weather conditions, but the variations were not similar among species. This being consistent with the expected influence of their ecological and biological differences. This garden bird survey in winter also reflected the global negative trends observed for some granivorous species in France or Europe during the breeding season, confirming that the use of garden bird feeders by wild bird species offers a new tool to survey the global population trends. We also suspect that variation in abundance could mirror spatial differences, and maybe mirror human activities impacts such as poaching, but this part requires further investigation. Finally, our work could be beneficial for maintaining declining seedeater species, by advising to supply birds with winter food in garden located in intensive agricultural landscape, while continuing to engage the public with nature.
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https://tel.archives-ouvertes.fr/tel-01887575
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Submitted on : Thursday, October 4, 2018 - 11:11:08 AM
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Pauline Pierret. Devine qui vient dîner … : graines des villes et graines des champs, ou l'impact de l'agriculture péri-urbaine sur les oiseaux des jardins. Ecologie, Environnement. Museum national d'histoire naturelle - MNHN PARIS, 2018. Français. ⟨NNT : 2018MNHN0003⟩. ⟨tel-01887575⟩

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