| Titre : | Do migrating White-crested Elaenia, Elaenia albiceps chilensis, use stop-over sites en route to their breeding areas? Evidence from the central Monte desert, Argentina (2016) |
| Titre original: | Do migrating White-crested Elaenia, Elaenia albiceps chilensis, use stop-over sites en route to their breeding areas? |
| Auteurs : | Víctor R. Cueto, Auteur ; M. Cecilia Sagario, Auteur ; Javier Lopez de Casenave, Auteur |
| Type de document : | Article |
| Dans : | Emu - Austral Ornithologie (116(3) 2016) |
| Article en page(s) : | 301-304 |
| Résumé : | Very few bird species are able to complete a single long migratory flight. Instead, a far more common strategy is that birds rest and feed almost every day, accomplishing their journeys in a series of short flights. We evaluated if White-crested Elaenia (Elaenia albiceps chilensis) displays evidence of en route migratory disposition in the central Monte desert, Argentina. Recaptures and resights were lower for White-crested Elaenias than for Greater Wagtail-tyrants (Stigmatura budytoides; resident) and Southern Scrub-flycatchers (Sublegatus modestus; spring-summer visitor). The latter species showed site fidelity between years, but White-crested Elaenia did not. Percentage of individuals with cloacal protuberance was similar among the species, but individuals with brood patches were recorded only in Greater Wagtail-tyrants and Southern Scrub-flycatchers. White-crested Elaenias showed low, medium and high fat stores, while the other species presented no fat or low fat stores. White-crested Elaenia had a high level of fruit consumption, while the other species consumed fruits occasionally or not at all. Our results support the hypothesis that the White-crested Elaenia uses the Monte desert as a stop-over area during its spring flight, and yield novel insights to fill a gap in our knowledge about the annual cycle of migrant birds in the Neotropics. |
| En ligne : | http://dx.doi.org/10.1071/MU15078 |



