| Titre : | Evidence for longitudinal migration by a “sedentary” Brazilian flycatcher, the Ash-throated Casiornis |
| Auteurs : | Alexander C. Lees, Auteur |
| Type de document : | Article |
| Dans : | Journal of Field Ornithology (87(3) septembre 1, 2016) |
| Article en page(s) : | 251-259 |
| Langues: | Anglais |
| Mots-clés: | Pará ; WikiAves ; eBird ; precipitation ; secondary habitat ; suboscine |
| Résumé : | The digitalization of museum collections and concurrent increase in citizen-science initiatives is ushering in an era of unprecedented availability of primary biodiversity data. These changes permit a reappraisal of phenological patterns of tropical species. I examined spatio-temporal variation in the distribution patterns of an ostensibly sedentary endemic Brazilian flycatcher, the Ash-throated Casiornis (Casiornis fuscus), using both specimen data from museums and sighting records and rich media data from citizen-science initiatives. I found compelling evidence for partial intratropical longitudinal migration to Amazonia and the Cerrado biomes from the species’ core range in the semi-desert Caatinga biome and adjacent ecotones. These records from outside of the Caatinga were distributed during the height of the dry season from April to October, although the Caatinga is not entirely vacated at this time. This pattern of partial migration leads to a doubling of the distributional range of Ash-throated Casiornises and strongly suggests that the species is a breeding near-endemic of the Caatinga biome. This pattern was potentially previously not apparent because of significant biases in specimen collection between biomes, giving a false sense of abundance in the Brazilian Amazon. |
| En ligne : | http://onlinelibrary.wiley.com/doi/10.1111/jofo.12159/abstract |



