Migratory patterns of Fork-tailed Flycatchers (Tyrannus s. savana)-reference-data

Jahn AE, Cereghetti J, Cueto VR, Hallworth MT, Levey DJ, Marini MÂ, Masson D, Pizo MA, Sarasola JH, Tuero DT. 2019. Migratory patterns of Fork-tailed Flycatchers (Tyrannus s. savana)-reference-data. Movebank Data Repository. https://doi.org/10.5441/001/1.d95m633h/3
(1) Identifying the processes that determine avian migratory strategies in different environmental contexts is imperative to understanding the constraints to survival and reproduction faced by migratory birds across the planet. (2) We compared the spring migration strategies of Fork-tailed Flycatchers (Tyrannus s. savana) that breed at south-temperate latitudes (i.e., austral migrants) vs. tropical latitudes (i.e., intra-tropical migrants) in South America. We hypothesized that austral migrant flycatchers are more time-selected than intra- tropical migrants during spring migration. As such, we predicted that that austral migrants, which migrate further than intra-tropical migrants, will migrate at a faster rate and that the rate of migration for austral migrants will be positively correlated with the onset of spring migration. (3) We attached light-level geolocators to Fork-tailed Flycatchers at two tropical breeding sites in Brazil and at two south-temperate breeding sites in Argentina and tracked their movements until the following breeding season. (4) Of 286 geolocators that were deployed, 37 were recovered ~1 year later, of which 28 provided useable data. Rate of spring migration did not differ significantly between the two groups, and only at one site was there a significantly positive relationship between date of initiation of spring migration and arrival date. (5) This represents the first comparison of individual migratory strategies among conspecific passerines breeding at tropical vs. temperate latitudes and suggests that austral migrant Fork-tailed Flycatchers in South America are not more time- selected on spring migration than intra-tropical migrant conspecifics. Low sample sizes could have diminished our power to detect differences (e.g., between sexes), such that further research into the mechanisms underpinning migratory strategies in this poorly understood system is necessary.
animal movement,animal tracking,avian migration,Argentina,Brazil,Cerrado,fork-tailed flycatcher,geolocator,life history,light-level logger,Pampas,South America,Tyrannus savana,Tyrannus s. savana
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  title = {Migratory patterns of Fork-tailed Flycatchers (Tyrannus s. savana)-reference-data},
  author = {Jahn, AE and Cereghetti, J and Cueto, VR and Hallworth, MT and Levey, DJ and Marini, MÂ and Masson, D and Pizo, MA and Sarasola, JH and Tuero, DT},
  year = {2019},
  URL = {http://dx.doi.org/10.5441/001/1.d95m633h/3},
  doi = {doi:10.5441/001/1.d95m633h/3},
  publisher = {Movebank data repository}
ID  - doi:10.5441/001/1.d95m633h/3
T1  - Migratory patterns of Fork-tailed Flycatchers (Tyrannus s. savana)-reference-data
AU  - Jahn, Alex E.
AU  - Cereghetti, Joaquín
AU  - Cueto, Víctor R.
AU  - Hallworth, Michael T.
AU  - Levey, Douglas J.
AU  - Marini, Miguel Â.
AU  - Masson, Diego
AU  - Pizo, Marco A.
AU  - Sarasola, José Hernán
AU  - Tuero, Diego T.
Y1  - 2019/04/01
KW  - animal movement
KW  - animal tracking
KW  - avian migration
KW  - Argentina
KW  - Brazil
KW  - Cerrado
KW  - fork-tailed flycatcher
KW  - geolocator
KW  - life history
KW  - light-level logger
KW  - Pampas
KW  - South America
KW  - Tyrannus savana
KW  - Tyrannus s. savana
KW  - Tyrannus savana
KW  - Tyrannus s. savana
PB  - Movebank data repository
UR  - http://dx.doi.org/10.5441/001/1.d95m633h/3
DO  - doi:10.5441/001/1.d95m633h/3
ER  -