A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni)

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We examined the fasting migration hypothesis for Swainson’s Hawks (Buteo swainsoni) by estimating the length, duration, and speed of the migration between North and South America and measuring changes in their body masses at various times throughout the year. We instrumented 34 adult Swainson’s Hawk...

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Autores principales: Bechard, Marc J., Sarasola, José Hernán, Woodbridge, Brian
Lenguaje:Inglés
Publicado: 2006
Materias:
AGUILUCHO LANGOSTERO
AYUNO
BUTEO SWAINSONI
MIGRACION
PESO CORPORAL
BODY MASS
FASTING
MIGRATION
SWAINSON’S HAWK
Acceso en línea:https://hdl.handle.net/20.500.12110/hornero_v021_n02_p065
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:hornero_v021_n02_p065
record_format dspace
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv Inglés
topic AGUILUCHO LANGOSTERO
AYUNO
BUTEO SWAINSONI
MIGRACION
PESO CORPORAL
BODY MASS
BUTEO SWAINSONI
FASTING
MIGRATION
SWAINSON’S HAWK
spellingShingle AGUILUCHO LANGOSTERO
AYUNO
BUTEO SWAINSONI
MIGRACION
PESO CORPORAL
BODY MASS
BUTEO SWAINSONI
FASTING
MIGRATION
SWAINSON’S HAWK
Bechard, Marc J.
Sarasola, José Hernán
Woodbridge, Brian
A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni)
topic_facet AGUILUCHO LANGOSTERO
AYUNO
BUTEO SWAINSONI
MIGRACION
PESO CORPORAL
BODY MASS
BUTEO SWAINSONI
FASTING
MIGRATION
SWAINSON’S HAWK
description We examined the fasting migration hypothesis for Swainson’s Hawks (Buteo swainsoni) by estimating the length, duration, and speed of the migration between North and South America and measuring changes in their body masses at various times throughout the year. We instrumented 34 adult Swainson’s Hawks with satellite radios on their breeding grounds in western North America to determine the duration, length, and speed of the migration. Migrating south at 188 km/day, it took Swainson’s Hawks 51 days to complete their 13504 km migration to their austral summer grounds. Averaging only 150 km/day on their return migration, it took them 60 days to complete the shorter 11952 km migration back to North America. Adult male and female Swainson’s Hawks had average body masses of 872 g and 1131 g, respectively, when they departed from North America in September and their body masses upon arrival in Argentina averaged 759 g for adult males and 933 g for adult females, indicating they lost only an average of 18% of their body masses during migration. Adult male and female Swainson’s Hawks had body masses of 792 g and 1013 g, respectively, in February prior to their departure from Argentina and they returned to the breeding grounds in North America weighing 802 g and 1087 g in April. Our results indicate that the fasting migration model does not predict the actual body masses of Swainson’s Hawks during the migration season and it should be modified to account for either lower energy expenditures during migration or the possibility that the birds use a stopover strategy during migration, feeding and regaining, or maintaining, fat stores along the migration route.
author Bechard, Marc J.
Sarasola, José Hernán
Woodbridge, Brian
author_facet Bechard, Marc J.
Sarasola, José Hernán
Woodbridge, Brian
author_sort Bechard, Marc J.
title A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni)
title_short A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni)
title_full A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni)
title_fullStr A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni)
title_full_unstemmed A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni)
title_sort re-evaluation of evidence raises questions about the fasting migration hypothesis for swainson’s hawk (buteo swainsoni)
publishDate 2006
url https://hdl.handle.net/20.500.12110/hornero_v021_n02_p065
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spelling todo:hornero_v021_n02_p0652023-10-03T13:48:45Z A re-evaluation of evidence raises questions about the fasting migration hypothesis for Swainson’s Hawk (Buteo swainsoni) Nuevas evidencias cuestionan la hipótesis del ayuno durante la migración para el aguilucho langostero (Buteo swainsoni) Bechard, Marc J. Sarasola, José Hernán Woodbridge, Brian AGUILUCHO LANGOSTERO AYUNO BUTEO SWAINSONI MIGRACION PESO CORPORAL BODY MASS BUTEO SWAINSONI FASTING MIGRATION SWAINSON’S HAWK We examined the fasting migration hypothesis for Swainson’s Hawks (Buteo swainsoni) by estimating the length, duration, and speed of the migration between North and South America and measuring changes in their body masses at various times throughout the year. We instrumented 34 adult Swainson’s Hawks with satellite radios on their breeding grounds in western North America to determine the duration, length, and speed of the migration. Migrating south at 188 km/day, it took Swainson’s Hawks 51 days to complete their 13504 km migration to their austral summer grounds. Averaging only 150 km/day on their return migration, it took them 60 days to complete the shorter 11952 km migration back to North America. Adult male and female Swainson’s Hawks had average body masses of 872 g and 1131 g, respectively, when they departed from North America in September and their body masses upon arrival in Argentina averaged 759 g for adult males and 933 g for adult females, indicating they lost only an average of 18% of their body masses during migration. Adult male and female Swainson’s Hawks had body masses of 792 g and 1013 g, respectively, in February prior to their departure from Argentina and they returned to the breeding grounds in North America weighing 802 g and 1087 g in April. Our results indicate that the fasting migration model does not predict the actual body masses of Swainson’s Hawks during the migration season and it should be modified to account for either lower energy expenditures during migration or the possibility that the birds use a stopover strategy during migration, feeding and regaining, or maintaining, fat stores along the migration route. Se examinó la hipótesis del ayuno durante la migración para el Aguilucho Langostero (Buteo swainsoni) mediante la estimación de la longitud, la duración y la velocidad de migración entre América del Norte y del Sur, y la medición de los cambios en el peso corporal en varios momentos a lo largo del año. Se colocaron transmisores satelitales a 34 aguiluchos adultos en sus áreas de cría en el oeste de América del Norte para determinar la duración, la longitud y la velocidad de la migración. En su migración al sur, a 188 km/día, el Aguilucho Langostero tarda 51 días para completar los 13504 km hasta las áreas donde permanece durante el verano austral. A un promedio de solo 150 km/día en su migración de retorno, le toma 60 días completar los 11952 km de regreso a América del Norte. Los machos y hembras adultos de Aguilucho Langostero tuvieron un peso corporal promedio de 872 g y 1131 g, respectivamente, cuando partían de América del Norte en septiembre, y su peso corporal al arribar a Argentina promedió 759 g en los machos adultos y 933 g en las hembras adultas, indicando que pierden, en promedio, solo el 18% de su peso corporal durante la migración. En febrero, antes de su partida de Argentina, los machos y hembras adultos de Aguilucho Langostero tuvieron un peso corporal de 792 g y 1013 g, respectivamente, y llegaron a sus áreas de cría en América del Norte pesando 802 g y 1087 g, en abril. Los resultados indican que el modelo de ayuno durante la migración no predice los pesos corporales reales del Aguilucho Langostero durante la estación migratoria y que debería ser modificado para dar cuenta de menores gastos energéticos durante la migración o la posibilidad de que las aves usen una estrategia de paradas durante la migración, alimentándose e incorporando (o manteniendo) grasa a lo largo de la ruta migratoria. 2006-12 PDF Inglés info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar https://hdl.handle.net/20.500.12110/hornero_v021_n02_p065

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