Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay

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Ecological conditions in breeding and non-breeding areas of migrant birds have been linked to their annual survival and production of young, but the role of stopover sites is under-appreciated. Through banding studies and censuses along the flyway from Tierra del Fuego to the Canadian Arctic, the dr...

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Detalles Bibliográficos
Autores principales: González, Patricia M., Baker, Allan J., Echave, María Eugenia
Lenguaje:Inglés
Publicado: 2006
Materias:
CALIDRIS CANUTUS
DOMINO EFFECTS
MIGRATION
POPULATION DECLINE
RED KNOT
STOPOVER ECOLOGY
DECLINACION POBLACIONAL
ECOLOGIA DE ESCALA MIGRATORIA
EFECTO DOMINO
MIGRACION
PLAYERO ROJIZO
Acceso en línea:https://hdl.handle.net/20.500.12110/hornero_v021_n02_p109
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:hornero_v021_n02_p109
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 CALIDRIS CANUTUS
DOMINO EFFECTS
MIGRATION
POPULATION DECLINE
RED KNOT
STOPOVER ECOLOGY
CALIDRIS CANUTUS
DECLINACION POBLACIONAL
ECOLOGIA DE ESCALA MIGRATORIA
EFECTO DOMINO
MIGRACION
PLAYERO ROJIZO
spellingShingle CALIDRIS CANUTUS
DOMINO EFFECTS
MIGRATION
POPULATION DECLINE
RED KNOT
STOPOVER ECOLOGY
CALIDRIS CANUTUS
DECLINACION POBLACIONAL
ECOLOGIA DE ESCALA MIGRATORIA
EFECTO DOMINO
MIGRACION
PLAYERO ROJIZO
González, Patricia M.
Baker, Allan J.
Echave, María Eugenia
Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay
topic_facet CALIDRIS CANUTUS
DOMINO EFFECTS
MIGRATION
POPULATION DECLINE
RED KNOT
STOPOVER ECOLOGY
CALIDRIS CANUTUS
DECLINACION POBLACIONAL
ECOLOGIA DE ESCALA MIGRATORIA
EFECTO DOMINO
MIGRACION
PLAYERO ROJIZO
description Ecological conditions in breeding and non-breeding areas of migrant birds have been linked to their annual survival and production of young, but the role of stopover sites is under-appreciated. Through banding studies and censuses along the flyway from Tierra del Fuego to the Canadian Arctic, the drastic decline in 2000–2001 of Red Knots (Calidris canutus rufa) population summering in southern South America in the northern winter was shown to be related to the overharvesting of horseshoe crabs (Limulus polyphemus) in Delaware Bay, USA, their last stopover site before reaching their breeding grounds, and to the late arrival of the birds at this site. In San Antonio Oeste, Argentina, where 25–50% of the Tierra del Fuego Red Knots population congregates every northward migration season, annual survival of the cohort of experienced birds banded in March 1998 was impacted a year later than the general decline. Knots marked at San Antonio Oeste earlier in March arrived in Delaware Bay on average before those marked 15 days later. Additionally, early migrating knots with active body moult in San Antonio Oeste exhibited a higher return rate in the following years than late and non-moulting birds. Since the decline, birds arriving late in Delaware Bay have been at increased risk of not being able to refuel properly or on time because food is no longer superabundant at that stopover site. These domino effects indicate that there are fitness consequences to individual migration strategies adopted by birds at austral summering and stopover sites, which can be amplified by compressed timing in Delaware Bay when food is depleted at this final stopover site.
author González, Patricia M.
Baker, Allan J.
Echave, María Eugenia
author_facet González, Patricia M.
Baker, Allan J.
Echave, María Eugenia
author_sort González, Patricia M.
title Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay
title_short Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay
title_full Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay
title_fullStr Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay
title_full_unstemmed Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay
title_sort annual survival of red knots (calidris canutus rufa) using the san antonio oeste stopover site is reduced by domino effects involving late arrival and food depletion in delaware bay
publishDate 2006
url https://hdl.handle.net/20.500.12110/hornero_v021_n02_p109
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spelling todo:hornero_v021_n02_p1092023-10-03T13:48:48Z Annual survival of Red Knots (Calidris canutus rufa) using the San Antonio Oeste stopover site is reduced by domino effects involving late arrival and food depletion in Delaware Bay Reducción de la supervivencia anual del playero rojizo (Calidris canutus rufa) en su escala migratoria de San Antonio Oeste, Argentina, por efectos dominó de llegada tardía y depresión del recurso trófico en Bahía Delaware González, Patricia M. Baker, Allan J. Echave, María Eugenia CALIDRIS CANUTUS DOMINO EFFECTS MIGRATION POPULATION DECLINE RED KNOT STOPOVER ECOLOGY CALIDRIS CANUTUS DECLINACION POBLACIONAL ECOLOGIA DE ESCALA MIGRATORIA EFECTO DOMINO MIGRACION PLAYERO ROJIZO Ecological conditions in breeding and non-breeding areas of migrant birds have been linked to their annual survival and production of young, but the role of stopover sites is under-appreciated. Through banding studies and censuses along the flyway from Tierra del Fuego to the Canadian Arctic, the drastic decline in 2000–2001 of Red Knots (Calidris canutus rufa) population summering in southern South America in the northern winter was shown to be related to the overharvesting of horseshoe crabs (Limulus polyphemus) in Delaware Bay, USA, their last stopover site before reaching their breeding grounds, and to the late arrival of the birds at this site. In San Antonio Oeste, Argentina, where 25–50% of the Tierra del Fuego Red Knots population congregates every northward migration season, annual survival of the cohort of experienced birds banded in March 1998 was impacted a year later than the general decline. Knots marked at San Antonio Oeste earlier in March arrived in Delaware Bay on average before those marked 15 days later. Additionally, early migrating knots with active body moult in San Antonio Oeste exhibited a higher return rate in the following years than late and non-moulting birds. Since the decline, birds arriving late in Delaware Bay have been at increased risk of not being able to refuel properly or on time because food is no longer superabundant at that stopover site. These domino effects indicate that there are fitness consequences to individual migration strategies adopted by birds at austral summering and stopover sites, which can be amplified by compressed timing in Delaware Bay when food is depleted at this final stopover site. Si bien se ha relacionado la condición de las áreas de estadía no reproductiva y reproductiva de las aves migratorias con su supervivencia y producción de crías, el papel de los sitios de escala como limitante del tamaño poblacional es escasamente conocido. Mediante estudios de anillado y censos a lo largo de la ruta de vuelo desde Tierra del Fuego hasta el Ártico de Canadá, hemos relacionado la drástica declinación de la población de Playero Rojizo (Calidris canutus rufa) ocurrida durante 2000–2001 con la sobrepesca del cangrejo herradura (Limulus polyphemus) en su última escala en la migración hacia el norte (Bahía Delaware, EEUU) y la llegada tardía de las aves. En San Antonio Oeste, Argentina, donde se congrega el 25–50% de la población de Tierra del Fuego durante la migración al norte, el seguimiento de aves experimentadas de la cohorte anillada en marzo de 1998 permitió estimar que su supervivencia fue afectada un año más tarde que la declinación general. Las aves marcadas más temprano en marzo llegaron antes a Bahía Delaware, en promedio, que las marcadas 15 días después. Además, las aves tempranas con presencia de muda activa de plumaje corporal mostraron una tasa de retorno significativamente mayor en años posteriores que las aves sin muda activa. Desde la declinación, las aves tardías incrementaron el riesgo de no acumular reservas apropiadamente o a tiempo, debido a que el recurso trófico dejó de ser superabundante en Bahía Delaware. Estos efectos dominó indican que las estrategias de migración individuales originadas en las áreas de estadía austral y en los sitios de escala migratoria tienen consecuencias sobre la adecuación biológica y que éstas pueden ser amplificadas por la reducción en el tiempo de estadía en Bahía Delaware cuando el recurso trófico es escaso en este sitio. 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_p109

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