| Titre : | The influence of climate variability on the productivity of common songbirds |
| Auteurs : | Nathalie Adenot, Auteur |
| Type de document : | Mémoire |
| Editeur : | Rennes (FRA) : Université de Rennes, 2023 |
| Format : | 54 |
| Note générale : | MSc Biodiversity Ecology and Evolution |
| Langues: | Anglais |
| Mots-clés : | France ; Aves ; Reproduction ; nidification ; Sécheresse ; Canicule |
| Mots-clés: | climate change – drought – offspring productivity - songbirds |
| Résumé : | Climate change affects population dynamics through a global warming and increase of extreme climatic events in both frequency and intensity. Many studies have focused on the influence of temperature on bird reproduction, but the effects of climate variability on productivity remains poorly understood. We used a 23-year long dataset from the French constant effort site ringing scheme to investigate the overall impact of drought and heat waves on the productivity of songbirds and whether species’ traits such as migration status or habitat influenced responses to climate variability. Temperature was the main environmental driver of interannual variations in productivity, mediated by a change in breeding phenology. Warmer temperatures during the early breeding period had a positive effect on offspring production, while drought negatively affected productivity. These responses to climatic variability were more pronounced in sites with a lower local average temperature and species living in a terrestrial habitat. Long-distance migrants were more strongly impacted by an early drought because of their limited flexibility of breeding phenology. Later in the breeding period, after eggs have hatched, meteorological variability had a weaker effect on productivity and we did not find clear patterns. Nevertheless, variations in productivity associated with meteorological variability are small compared to variations driven by density-dependence. Therefore, more processes have to be considered to explain changes in population dynamics. |
| En ligne : | https://crbpo.mnhn.fr/IMG/pdf/adenot_2023_m2_thesis.pdf |



