Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo

Little quantitative information on the development and behaviour of chicks and young is available for many species, despite the crucial importance of such data and the sensitivity of this stage in a bird's life. For Eagle Owls Bubo bubo, despite the large amount of scientific literature on this...

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Autores: Penteriani, Vincenzo, Delgado Sánchez, María del Mar, Maggio, C., Aradis, A., Sergio, Fabrizio
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/59646
Acceso en línea:http://hdl.handle.net/10261/59646
Access Level:acceso abierto
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spelling Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo buboPenteriani, VincenzoDelgado Sánchez, María del MarMaggio, C.Aradis, A.Sergio, FabrizioLittle quantitative information on the development and behaviour of chicks and young is available for many species, despite the crucial importance of such data and the sensitivity of this stage in a bird's life. For Eagle Owls Bubo bubo, despite the large amount of scientific literature on this species, much basic information is lacking. This study provides a photographic and morphometric guide for age estimation of nestlings and fledglings, as well as data on the call behaviour of young, and patterns of movements during the post-fledging dependence period. The most remarkable event in chick development is the rapid increase in mass, and size gain, during the first 30 and 40-45 days, respectively. Because after this time morphometric differences become less evident, young-feather development is more useful for ageing. Patterns of chick call behaviour showed that the time spent calling increased with age and, from 110 days of age, chick vocalizations were usually uniformly distributed through the whole night and most synchronized at sunset and sunrise (the maximum recorded number of vocalizations per chick and per night was 1106 calls). During the post-fledging dependence period, radiotagged Owls moved widely, up to 1500 m from the nest after the age of 80-90 days. During such movements, the mean distance among siblings increased with age, from 168 m on average for juveniles less than 100 days old, to 489 m for those older than 100 days. Definitive dispersal started when young were about 150-160 days old. Information on chick call behaviour and movements is crucial for unbiased census and nest checking, as well as for the definition of young post-fledging areas. Knowledge of the latter is very important in terms of conservation and management (especially for those species that move largely around their nest before dispersal) owing to the high mortality that can occur during this period.Peer ReviewedBlackwell Publishing2012201220052012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/59646reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/596462026-05-22T06:33:51Z
dc.title.none.fl_str_mv Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
title Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
spellingShingle Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
Penteriani, Vincenzo
title_short Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
title_full Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
title_fullStr Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
title_full_unstemmed Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
title_sort Development of chicks and predispersal behaviour of young in the Eagle Owl Bubo bubo
dc.creator.none.fl_str_mv Penteriani, Vincenzo
Delgado Sánchez, María del Mar
Maggio, C.
Aradis, A.
Sergio, Fabrizio
author Penteriani, Vincenzo
author_facet Penteriani, Vincenzo
Delgado Sánchez, María del Mar
Maggio, C.
Aradis, A.
Sergio, Fabrizio
author_role author
author2 Delgado Sánchez, María del Mar
Maggio, C.
Aradis, A.
Sergio, Fabrizio
author2_role author
author
author
author
description Little quantitative information on the development and behaviour of chicks and young is available for many species, despite the crucial importance of such data and the sensitivity of this stage in a bird's life. For Eagle Owls Bubo bubo, despite the large amount of scientific literature on this species, much basic information is lacking. This study provides a photographic and morphometric guide for age estimation of nestlings and fledglings, as well as data on the call behaviour of young, and patterns of movements during the post-fledging dependence period. The most remarkable event in chick development is the rapid increase in mass, and size gain, during the first 30 and 40-45 days, respectively. Because after this time morphometric differences become less evident, young-feather development is more useful for ageing. Patterns of chick call behaviour showed that the time spent calling increased with age and, from 110 days of age, chick vocalizations were usually uniformly distributed through the whole night and most synchronized at sunset and sunrise (the maximum recorded number of vocalizations per chick and per night was 1106 calls). During the post-fledging dependence period, radiotagged Owls moved widely, up to 1500 m from the nest after the age of 80-90 days. During such movements, the mean distance among siblings increased with age, from 168 m on average for juveniles less than 100 days old, to 489 m for those older than 100 days. Definitive dispersal started when young were about 150-160 days old. Information on chick call behaviour and movements is crucial for unbiased census and nest checking, as well as for the definition of young post-fledging areas. Knowledge of the latter is very important in terms of conservation and management (especially for those species that move largely around their nest before dispersal) owing to the high mortality that can occur during this period.
publishDate 2005
dc.date.none.fl_str_mv 2005
2012
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/59646
url http://hdl.handle.net/10261/59646
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Blackwell Publishing
publisher.none.fl_str_mv Blackwell Publishing
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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score 15,811543

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