Cargando…
Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America
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...
Autores principales: | , , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6540664/ https://www.ncbi.nlm.nih.gov/pubmed/31160996 http://dx.doi.org/10.1002/ece3.5159 |
_version_ | 1783422667929419776 |
---|---|
author | Jahn, Alex E. Cereghetti, Joaquín Cueto, Víctor R. Hallworth, Michael T. Levey, Douglas J. Marini, Miguel Â. Masson, Diego Pizo, Marco A. Sarasola, José Hernán Tuero, Diego T. |
author_facet | Jahn, Alex E. Cereghetti, Joaquín Cueto, Víctor R. Hallworth, Michael T. Levey, Douglas J. Marini, Miguel Â. Masson, Diego Pizo, Marco A. Sarasola, José Hernán Tuero, Diego T. |
author_sort | Jahn, Alex E. |
collection | PubMed |
description | 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., intratropical migrants) in South America. We hypothesized that austral migrant flycatchers are more time‐selected than intratropical migrants during spring migration. As such, we predicted that austral migrants, which migrate further than intratropical 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 intratropical 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. |
format | Online Article Text |
id | pubmed-6540664 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-65406642019-06-03 Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America Jahn, Alex E. Cereghetti, Joaquín Cueto, Víctor R. Hallworth, Michael T. Levey, Douglas J. Marini, Miguel Â. Masson, Diego Pizo, Marco A. Sarasola, José Hernán Tuero, Diego T. Ecol Evol Original Research 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., intratropical migrants) in South America. We hypothesized that austral migrant flycatchers are more time‐selected than intratropical migrants during spring migration. As such, we predicted that austral migrants, which migrate further than intratropical 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 intratropical 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. John Wiley and Sons Inc. 2019-04-16 /pmc/articles/PMC6540664/ /pubmed/31160996 http://dx.doi.org/10.1002/ece3.5159 Text en © 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Research Jahn, Alex E. Cereghetti, Joaquín Cueto, Víctor R. Hallworth, Michael T. Levey, Douglas J. Marini, Miguel Â. Masson, Diego Pizo, Marco A. Sarasola, José Hernán Tuero, Diego T. Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America |
title | Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America |
title_full | Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America |
title_fullStr | Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America |
title_full_unstemmed | Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America |
title_short | Breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in South America |
title_sort | breeding latitude predicts timing but not rate of spring migration in a widespread migratory bird in south america |
topic | Original Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6540664/ https://www.ncbi.nlm.nih.gov/pubmed/31160996 http://dx.doi.org/10.1002/ece3.5159 |
work_keys_str_mv | AT jahnalexe breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT cereghettijoaquin breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT cuetovictorr breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT hallworthmichaelt breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT leveydouglasj breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT marinimiguela breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT massondiego breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT pizomarcoa breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT sarasolajosehernan breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica AT tuerodiegot breedinglatitudepredictstimingbutnotrateofspringmigrationinawidespreadmigratorybirdinsouthamerica |