| Titre : | Does breeding success lead meadow passerines to select late mown fields? |
| Auteurs : | Joël Broyer, Auteur ; Laurence Curtet, Auteur ; Melanie Boissenin, Auteur |
| Type de document : | Article |
| Dans : | Journal of Ornithology (153(3) JUL 2012) |
| Article en page(s) : | 817-823 |
| Langues: | Anglais |
| Résumé : | Agri-environment schemes usually assume that suitable management in patches of grassland habitat may benefit bird populations in improving the overall demographic balance. In this study, we investigate the hypothesis that nesting site fidelity after previous breeding success might lead meadow birds to select late mown fields where the risk of breeding failure is lower. It was carried out in 4 study areas of the M,zenc volcanic massif (south-east of France) within the altitude range 1,150-1,350 m. Meadow passerine territories were defined by the territory mapping method, and reproductive success in Whinchat Saxicola rubetra territories was assessed by the observation of prey carrying and juveniles just leaving nests. A comparison of models led us to consider that territorial birds selected hay fields under the influence of grass structure rather than through a theoretical successful experience of late mowing. Higher territory density was observed in fields with dense grass cover a parts per thousand yen50 cm which were usually more fertilized (> 75 kg ha (-1) nitrogen per year) and mown earlier. In 3 study sites, however, the rate of nesting failure due to mowing was lower than expected under the hypothesis of randomly distributed nesting sites, suggesting that the risk was not ignored by territorial birds. Within each study site, we also observed higher invertebrate abundance during the chick feeding period in fields with high bird territory density. |
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