Roosts and migrations of swallows

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Swallows of the north temperate zone display a wide variety of territorial behaviour during the breeding season, but as soon as breeding is over, they all appear to adopt a pattern of independent diurnal foraging interleaved with aggregation every night in dense roosts. Swallows generally migrate du...

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Detalles Bibliográficos
Autor principal: Winkler, David W.
Lenguaje:Inglés
Publicado: 2006
Materias:
DIURNAL
HIRUNDINIDAE
MARTINS
MIGRATION
NOCTURNAL
ROOST
SWALLOWS
DIURNO
DORMIDERO
GOLONDRINAS
MIGRACION
NOCTURNO
Acceso en línea:https://hdl.handle.net/20.500.12110/hornero_v021_n02_p085
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:hornero_v021_n02_p085
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 DIURNAL
HIRUNDINIDAE
MARTINS
MIGRATION
NOCTURNAL
ROOST
SWALLOWS
DIURNO
DORMIDERO
GOLONDRINAS
HIRUNDINIDAE
MIGRACION
NOCTURNO
spellingShingle DIURNAL
HIRUNDINIDAE
MARTINS
MIGRATION
NOCTURNAL
ROOST
SWALLOWS
DIURNO
DORMIDERO
GOLONDRINAS
HIRUNDINIDAE
MIGRACION
NOCTURNO
Winkler, David W.
Roosts and migrations of swallows
topic_facet DIURNAL
HIRUNDINIDAE
MARTINS
MIGRATION
NOCTURNAL
ROOST
SWALLOWS
DIURNO
DORMIDERO
GOLONDRINAS
HIRUNDINIDAE
MIGRACION
NOCTURNO
description Swallows of the north temperate zone display a wide variety of territorial behaviour during the breeding season, but as soon as breeding is over, they all appear to adopt a pattern of independent diurnal foraging interleaved with aggregation every night in dense roosts. Swallows generally migrate during the day, feeding on the wing. On many stretches of their annual journeys, their migrations can thus be seen as the simple spatial translation of nocturnal roost sites with foraging routes straightening out to connect them. However, swallows that must make long journeys over ecological barriers clearly fly at night as well as in the day, and many suggestions indicate that there is considerable complexity in the altitude and bearing of flights even during the day. There are especially intriguing indications that much swallow migration may take place high out of sight of ground observers with movements near the ground often associated with foraging in passage. Provided that roost sites can be reliably found, swallow migration can be extremely flexible, and there are interesting contrasts in the biogeography and phenological flexibility of swallows compared to other passerine birds. Even within the swallows, there is considerable interspecific and intraspecifc variability in the distances of their annual migrations, and we are only just beginning to understand the biological causes and consequences of this variation. The profusion of Doppler weather radar stations in the eastern United States has allowed the characterization in considerable detail of the North American distributions of Tree Swallows (Tachycineta bicolor) and Purple Martins (Progne subis) throughout the non-breeding season. Evaluating the relative roles of movements and mortality in creating these patterns remains an important challenge for further research.
author Winkler, David W.
author_facet Winkler, David W.
author_sort Winkler, David W.
title Roosts and migrations of swallows
title_short Roosts and migrations of swallows
title_full Roosts and migrations of swallows
title_fullStr Roosts and migrations of swallows
title_full_unstemmed Roosts and migrations of swallows
title_sort roosts and migrations of swallows
publishDate 2006
url https://hdl.handle.net/20.500.12110/hornero_v021_n02_p085
work_keys_str_mv AT winklerdavidw roostsandmigrationsofswallows
AT winklerdavidw dormiderosymigracionesdegolondrinas
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spelling todo:hornero_v021_n02_p0852023-10-03T13:48:47Z Roosts and migrations of swallows Dormideros y migraciones de golondrinas Winkler, David W. DIURNAL HIRUNDINIDAE MARTINS MIGRATION NOCTURNAL ROOST SWALLOWS DIURNO DORMIDERO GOLONDRINAS HIRUNDINIDAE MIGRACION NOCTURNO Swallows of the north temperate zone display a wide variety of territorial behaviour during the breeding season, but as soon as breeding is over, they all appear to adopt a pattern of independent diurnal foraging interleaved with aggregation every night in dense roosts. Swallows generally migrate during the day, feeding on the wing. On many stretches of their annual journeys, their migrations can thus be seen as the simple spatial translation of nocturnal roost sites with foraging routes straightening out to connect them. However, swallows that must make long journeys over ecological barriers clearly fly at night as well as in the day, and many suggestions indicate that there is considerable complexity in the altitude and bearing of flights even during the day. There are especially intriguing indications that much swallow migration may take place high out of sight of ground observers with movements near the ground often associated with foraging in passage. Provided that roost sites can be reliably found, swallow migration can be extremely flexible, and there are interesting contrasts in the biogeography and phenological flexibility of swallows compared to other passerine birds. Even within the swallows, there is considerable interspecific and intraspecifc variability in the distances of their annual migrations, and we are only just beginning to understand the biological causes and consequences of this variation. The profusion of Doppler weather radar stations in the eastern United States has allowed the characterization in considerable detail of the North American distributions of Tree Swallows (Tachycineta bicolor) and Purple Martins (Progne subis) throughout the non-breeding season. Evaluating the relative roles of movements and mortality in creating these patterns remains an important challenge for further research. Las golondrinas de la zona templada de América del Norte poseen una amplia variedad de comportamientos territoriales durante la estación de cría, pero ni bien culmina la reproducción todas parecen adoptar un patrón común, alternando la alimentación diurna independiente con el agrupamiento en populosos dormideros durante la noche. Las golondrinas generalmente migran durante el día, alimentándose en vuelo; sus migraciones, entonces, pueden ser vistas como si fuesen un simple traslado entre distintos sitios que poseen dormideros nocturnos, con las rutas de alimentación conectándolos directamente. Sin embargo, las golondrinas que deben realizar largos viajes cruzando barreras ecológicas vuelan tanto de noche como de día, y hay evidencias que indican que hay una considerable complejidad en la altitud y en las características de los vuelos aún durante el día. Hay evidencias especialmente interesantes de que la mayor parte de la migración de las golondrinas puede tener lugar a una altura tal que no es advertida por los observadores en tierra, pero con movimientos cercanos al suelo a menudo asociados con la alimentación. Si los sitios con dormideros pueden ser encontrados con certeza, la migración de las golondrinas sería extremadamente flexible, y existen interesantes contrastes en la biogeografía y la flexibilidad de la fenología de las golondrinas en comparación con otros paseriformes. Entre las golondrinas mismas hay una considerable variabilidad inter e intraespecífica en la distancia de migración anual, y estamos aún empezando a entender las causas y las consecuencias biológicas de esta variación. La creciente disponibilidad de estaciones con radares climatológicos Doppler en el este de Estados Unidos ha permitido la caracterización, con un considerable detalle, de las distribuciones norteamericanas de la Golondrina Bicolor (Tachycineta bicolor) y la Golondrina Purpúrea (Progne subis) durante la estación no reproductiva. La evaluación del papel relativo que juegan los movimientos y la mortalidad en la conformación de esos patrones es un importante desafío para futuras investigaciones. 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_p085

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