High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)

[EN]: Isolated bird populations on oceanic islands may be good study models for the investigation of the interrelationships between social fractions of populations, especially due to their lack of long-range dispersal as a major mechanism influencing the dynamics and persistence of populations. We e...

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Detalhes bibliográficos
Autores: Blanco, Guillermo, Pais, Jorge L., Fargallo, Juan A., Potti, Jaime, Lemus, Jesús Angel, Dávila, José A.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2009
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/282702
Acesso em linha:http://hdl.handle.net/10261/282702
Access Level:acceso abierto
Palavra-chave:Aislamiento poblacional
Dispersión
Canary Islands
Floaters
La Palma
Pyrrhocorax pyrrhocorax
id ES_dbd0cb8cef9fd517c0b634caae6a668f
oai_identifier_str oai:digital.csic.es:10261/282702
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
Elevada proporción de no reproductores en una población insular de Chova Piquirroja (Las Palmas, Islas Canarias)
title High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
spellingShingle High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
Blanco, Guillermo
Aislamiento poblacional
Dispersión
Canary Islands
Floaters
La Palma
Pyrrhocorax pyrrhocorax
title_short High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
title_full High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
title_fullStr High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
title_full_unstemmed High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
title_sort High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)
dc.creator.none.fl_str_mv Blanco, Guillermo
Pais, Jorge L.
Fargallo, Juan A.
Potti, Jaime
Lemus, Jesús Angel
Dávila, José A.
author Blanco, Guillermo
author_facet Blanco, Guillermo
Pais, Jorge L.
Fargallo, Juan A.
Potti, Jaime
Lemus, Jesús Angel
Dávila, José A.
author_role author
author2 Pais, Jorge L.
Fargallo, Juan A.
Potti, Jaime
Lemus, Jesús Angel
Dávila, José A.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Educación y Ciencia (España)
Ministerio de Medio Ambiente (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Aislamiento poblacional
Dispersión
Canary Islands
Floaters
La Palma
Pyrrhocorax pyrrhocorax
topic Aislamiento poblacional
Dispersión
Canary Islands
Floaters
La Palma
Pyrrhocorax pyrrhocorax
description [EN]: Isolated bird populations on oceanic islands may be good study models for the investigation of the interrelationships between social fractions of populations, especially due to their lack of long-range dispersal as a major mechanism influencing the dynamics and persistence of populations. We examined whether the ratio of breeders to non-breeders varies in a completely isolated red-billed chough (Pyrrhocorax pyrrhocorax) population on an oceanic island (La Palma, Canary Islands) as compared to continental and other island populations, and assessed whether limited breeding opportunities may influence population crowding with non-breeding birds. The chough population in La Palma was composed of a proportion of non-breeders (about 60 %) representing twice the values reported in other populations. Most communal roosts were used during the breeding season by floaters sufficient in numbers to replace any loss among breeders. The average number of pairs nesting at several roosts did not differ between consecutive years despite much higher numbers of floaters using these sites throughout the year. The high proportion of non-breeding choughs suggests that nesting areas were saturated with non-breeding floaters due to some kind of limitation on breeding opportunities. Under conditions of isolation, limited breeding opportunities of floaters can not be eased by dispersing to other nuclei or vacant geographical areas outside the island, leading to a crowded non-breeding fraction. The dense chough population mostly composed of gregarious floaters in La Palma may be considered a guarantee of persistence and even future numerical increase. However, a low contribution of floaters to the effective population size compared with their contribution to the total population density may enhave repercussions in conservation by reducing the availability of essential resources for breeding pairs, which requires further research.
publishDate 2009
dc.date.none.fl_str_mv 2009
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/282702
url http://hdl.handle.net/10261/282702
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Sociedad Española de Ornitología
publisher.none.fl_str_mv Sociedad Española de Ornitología
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling High proportion of non breeding individuals inan isolated red-billed chough population on an Oceanic Island (La Palma, Canary Islands)Elevada proporción de no reproductores en una población insular de Chova Piquirroja (Las Palmas, Islas Canarias)Blanco, GuillermoPais, Jorge L.Fargallo, Juan A.Potti, JaimeLemus, Jesús AngelDávila, José A.Aislamiento poblacionalDispersiónCanary IslandsFloatersLa PalmaPyrrhocorax pyrrhocorax[EN]: Isolated bird populations on oceanic islands may be good study models for the investigation of the interrelationships between social fractions of populations, especially due to their lack of long-range dispersal as a major mechanism influencing the dynamics and persistence of populations. We examined whether the ratio of breeders to non-breeders varies in a completely isolated red-billed chough (Pyrrhocorax pyrrhocorax) population on an oceanic island (La Palma, Canary Islands) as compared to continental and other island populations, and assessed whether limited breeding opportunities may influence population crowding with non-breeding birds. The chough population in La Palma was composed of a proportion of non-breeders (about 60 %) representing twice the values reported in other populations. Most communal roosts were used during the breeding season by floaters sufficient in numbers to replace any loss among breeders. The average number of pairs nesting at several roosts did not differ between consecutive years despite much higher numbers of floaters using these sites throughout the year. The high proportion of non-breeding choughs suggests that nesting areas were saturated with non-breeding floaters due to some kind of limitation on breeding opportunities. Under conditions of isolation, limited breeding opportunities of floaters can not be eased by dispersing to other nuclei or vacant geographical areas outside the island, leading to a crowded non-breeding fraction. The dense chough population mostly composed of gregarious floaters in La Palma may be considered a guarantee of persistence and even future numerical increase. However, a low contribution of floaters to the effective population size compared with their contribution to the total population density may enhave repercussions in conservation by reducing the availability of essential resources for breeding pairs, which requires further research.[ES]: Las poblaciones de aves aisladas en islas oceánicas pueden ser buenos modelos de estudio para investigar las interrelaciones entre las distintas fracciones sociales, debido a la ausencia de dispersión de larga distancia como mecanismo influyente en la dinámica y persistencia de las poblaciones. Examinamos la razón de reproductores/no reproductores en una población completamente aislada de chova piquirroja (Pyrrhocorax pyrrhocorax) en una isla oceánica (La Palma, islas Canarias) en comparación con poblaciones continentales y otras poblaciones insulares, valorando cómo las posibles limitaciones en las oportunidades de reproducción pueden influir en la superpoblación de aves no reproductoras. La población de chovas de La Palma está compuesta por una proporción de individuos no reproductores (60 %) que representa el doble de los valores registrados en otras poblaciones. La mayoría de los dormideros comunales fueron utilizados durante la época de cría por un número de individuos no reproductores suficiente para reemplazar cualquier pérdida entre los individuos reproductores. El número promedio de parejas reproductoras en varios dormideros comunales no difirió entre años consecutivos a pesar de la abundancia mucho mayor de individuos no reproductores que utilizaron esos lugares a lo largo del año. Los resultados sugieren que las áreas de nidificación estuvieron saturadas debido a algún tipo de limitación en las oportunidades de reproducción. En condiciones de aislamiento poblacional, la limitación en las oportunidades de reproducción no puede solventarse mediante la dispersión a otros núcleos poblacionales o áreas geográficas vacantes, dando lugar a una fracción no reproductora superpoblada. La densa población de chovas no reproductoras de La Palma puede considerarse una garantía de persistencia e incluso futuro crecimiento poblacional. Sin embargo, la reducida contribución de la población flotante a la población efectiva comparada con su contribución a la densidad poblacional total podría tener repercusiones negativas en su conservación mediante la reducción de los recursos esenciales para las parejas reproductoras, lo que requiere mayor investigación.The study was funded by projects 082/2002 and BOS2003-05066 from the Spanish Ministerios de Medio Ambiente and Educación y Ciencia.Peer reviewedSociedad Española de OrnitologíaMinisterio de Educación y Ciencia (España)Ministerio de Medio Ambiente (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222009info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/282702reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2827022026-05-22T06:33:51Z
score 15.812455

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