Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size

Available energy stores determine stopover length, migration speed and likely survival in migrating birds. We measured energy stores by estimating fuel load in 11 species of Neotropical migrant songbirds in the Darién of Colombia over five years. We evaluated 1) whether individuals flying further fr...

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Autores principales:	Cárdenas-Ortiz Laura, Bayly Nicholas J., Hobson Keith A.
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bird migration deuterium el niño fuel load stable isotopes vulnerability Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/288df9d3a17c44d9bf094a549a8721df
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spelling	oai:doaj.org-article:288df9d3a17c44d9bf094a549a8721df2021-12-02T19:03:57ZFuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size2084-883810.1515/ami-2020-0105https://doaj.org/article/288df9d3a17c44d9bf094a549a8721df2021-06-01T00:00:00Zhttps://doi.org/10.1515/ami-2020-0105https://doaj.org/toc/2084-8838Available energy stores determine stopover length, migration speed and likely survival in migrating birds. We measured energy stores by estimating fuel load in 11 species of Neotropical migrant songbirds in the Darién of Colombia over five years. We evaluated 1) whether individuals flying further from breeding origin arrived with smaller fuel loads, 2) if the ENSO (El Niño-Southern Oscillation) cycle affected fuel load and 3) if species known to migrate mostly overwater arrived with less fuel relative to those migrating overland. Breeding origin, inferred from feather δ2H values, only had a significant positive effect on fuel load in Swainson’s Thrush (Catharus ustulatus). Veery (Catharus fuscescens) and Swainson’s thrush had higher and lower fuel loads, respectively, in El Niño years. Multi-species mixed-effects models revealed support for larger fuel loads in larger-bodied species and in species taking overwater routes, contrary to our prediction. Across species, we found no support for common effects of breeding origin or ENSO on fuel loads, in contrast to community-wide effects of migration route and body-size. In general, the variables considered here explained little of the variance in fuel loads, suggesting that inter-individual differences likely have a greater impact than broad-scale factors in our study system.Cárdenas-Ortiz LauraBayly Nicholas J.Hobson Keith A.De Gruyterarticlebird migrationdeuteriumel niñofuel loadstable isotopesvulnerabilityBiology (General)QH301-705.5ENAnimal Migration, Vol 8, Iss 1, Pp 29-39 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bird migration deuterium el niño fuel load stable isotopes vulnerability Biology (General) QH301-705.5
spellingShingle	bird migration deuterium el niño fuel load stable isotopes vulnerability Biology (General) QH301-705.5 Cárdenas-Ortiz Laura Bayly Nicholas J. Hobson Keith A. Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size
description	Available energy stores determine stopover length, migration speed and likely survival in migrating birds. We measured energy stores by estimating fuel load in 11 species of Neotropical migrant songbirds in the Darién of Colombia over five years. We evaluated 1) whether individuals flying further from breeding origin arrived with smaller fuel loads, 2) if the ENSO (El Niño-Southern Oscillation) cycle affected fuel load and 3) if species known to migrate mostly overwater arrived with less fuel relative to those migrating overland. Breeding origin, inferred from feather δ2H values, only had a significant positive effect on fuel load in Swainson’s Thrush (Catharus ustulatus). Veery (Catharus fuscescens) and Swainson’s thrush had higher and lower fuel loads, respectively, in El Niño years. Multi-species mixed-effects models revealed support for larger fuel loads in larger-bodied species and in species taking overwater routes, contrary to our prediction. Across species, we found no support for common effects of breeding origin or ENSO on fuel loads, in contrast to community-wide effects of migration route and body-size. In general, the variables considered here explained little of the variance in fuel loads, suggesting that inter-individual differences likely have a greater impact than broad-scale factors in our study system.
format	article
author	Cárdenas-Ortiz Laura Bayly Nicholas J. Hobson Keith A.
author_facet	Cárdenas-Ortiz Laura Bayly Nicholas J. Hobson Keith A.
author_sort	Cárdenas-Ortiz Laura
title	Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size
title_short	Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size
title_full	Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size
title_fullStr	Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size
title_full_unstemmed	Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size
title_sort	fuel loads of neotropical migrant songbirds on autumn passage through the darién region of colombia: influence of migratory distance, route, enso, age and body size
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/288df9d3a17c44d9bf094a549a8721df
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Fuel loads of Neotropical migrant songbirds on autumn passage through the Darién region of Colombia: Influence of migratory distance, route, ENSO, age and body size

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