Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species

Sexual size dimorphism (SSD) may favour physiological peculiarities in diet, behaviour and home-range size both across species and within species. Sex-specific differences in diet and behaviour have been reported in several bird species but there are fewer studies of foraging area size in sexually d...

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Autores: Bautista-Sopelana, Luis M., Bravo, Carolina, Ponce, Carlos, Unzué-Belmonte, Dácil, Alonso, Juan Carlos
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/145769
Acceso en línea:http://hdl.handle.net/10261/145769
Access Level:acceso abierto
Palabra clave:alimentación óptima
Área de campeo
dimorfismo sexual en tamaño
Movimiento animal
distribución de los tiempos
tamaño corporal
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oai_identifier_str oai:digital.csic.es:10261/145769
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repository_id_str
spelling Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird speciesBautista-Sopelana, Luis M.Bravo, CarolinaPonce, CarlosUnzué-Belmonte, DácilAlonso, Juan Carlosalimentación óptimaÁrea de campeodimorfismo sexual en tamañoMovimiento animaldistribución de los tiempostamaño corporalSexual size dimorphism (SSD) may favour physiological peculiarities in diet, behaviour and home-range size both across species and within species. Sex-specific differences in diet and behaviour have been reported in several bird species but there are fewer studies of foraging area size in sexually dimorphic bird species. Foraging area size should be greater in the bigger sex according to home-range size predictions based on body mass. We tested this prediction in a winter study of foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species, which forages in unisexual flocks. In this species the temporal pattern of a flock's feeding intensity; the proportion of birds actively feeding (FI) and the size of the morning foraging area (MFA) of each sex are unknown. We recorded the behaviour and movements of unisexual flocks of Great Bustards during winter mornings and sampled food availability to take into account its effect on FI and MFA. FI increased and then decreased through the morning in both sexes, and was lower in males than in females. This sexual difference was greater where legume availability was smaller. Legumes were the most preferred substrate type. Consequently, MFA sizes were smaller in sites with more legume availability. We did not find sexual differences either in the size of MFA or in the selection of the two preferred substrate types: legumes and stubble fields. MFA and FI were determined to a greater extent by ecological factors such as food availability than by metabolic requirements derived from body size differences. These results obtained from a short-term study do not preclude an effect of sexual size dimorphism on MFA size and FI of Great Bustards over longer periods but show that the body size effect on foraging behaviour may be smaller than predicted only by SSD.This study was funded by projects CGL2005-04893, CGL2008-02567 and CGL2012-36345. CB and CP were supported by a HENARSA-CSIC contract awarded to JCA.Peer reviewedSociedad Española de OrnitologíaMinisterio de Economía y Competitividad (España)Ministerio de Ciencia e Innovación (España)Ministerio de Educación y Cultura (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201720172017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/145769reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.13157/arla.64.2.2017.ra1Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1457692026-05-22T06:33:51Z
dc.title.none.fl_str_mv Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
title Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
spellingShingle Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
Bautista-Sopelana, Luis M.
alimentación óptima
Área de campeo
dimorfismo sexual en tamaño
Movimiento animal
distribución de los tiempos
tamaño corporal
title_short Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
title_full Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
title_fullStr Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
title_full_unstemmed Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
title_sort Food availability but not sex determines morning foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species
dc.creator.none.fl_str_mv Bautista-Sopelana, Luis M.
Bravo, Carolina
Ponce, Carlos
Unzué-Belmonte, Dácil
Alonso, Juan Carlos
author Bautista-Sopelana, Luis M.
author_facet Bautista-Sopelana, Luis M.
Bravo, Carolina
Ponce, Carlos
Unzué-Belmonte, Dácil
Alonso, Juan Carlos
author_role author
author2 Bravo, Carolina
Ponce, Carlos
Unzué-Belmonte, Dácil
Alonso, Juan Carlos
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Ministerio de Ciencia e Innovación (España)
Ministerio de Educación y Cultura (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv alimentación óptima
Área de campeo
dimorfismo sexual en tamaño
Movimiento animal
distribución de los tiempos
tamaño corporal
topic alimentación óptima
Área de campeo
dimorfismo sexual en tamaño
Movimiento animal
distribución de los tiempos
tamaño corporal
description Sexual size dimorphism (SSD) may favour physiological peculiarities in diet, behaviour and home-range size both across species and within species. Sex-specific differences in diet and behaviour have been reported in several bird species but there are fewer studies of foraging area size in sexually dimorphic bird species. Foraging area size should be greater in the bigger sex according to home-range size predictions based on body mass. We tested this prediction in a winter study of foraging area size in the Great Bustard Otis tarda, the most sexually size-dimorphic bird species, which forages in unisexual flocks. In this species the temporal pattern of a flock's feeding intensity; the proportion of birds actively feeding (FI) and the size of the morning foraging area (MFA) of each sex are unknown. We recorded the behaviour and movements of unisexual flocks of Great Bustards during winter mornings and sampled food availability to take into account its effect on FI and MFA. FI increased and then decreased through the morning in both sexes, and was lower in males than in females. This sexual difference was greater where legume availability was smaller. Legumes were the most preferred substrate type. Consequently, MFA sizes were smaller in sites with more legume availability. We did not find sexual differences either in the size of MFA or in the selection of the two preferred substrate types: legumes and stubble fields. MFA and FI were determined to a greater extent by ecological factors such as food availability than by metabolic requirements derived from body size differences. These results obtained from a short-term study do not preclude an effect of sexual size dimorphism on MFA size and FI of Great Bustards over longer periods but show that the body size effect on foraging behaviour may be smaller than predicted only by SSD.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017
2017
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/10261/145769
url http://hdl.handle.net/10261/145769
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.13157/arla.64.2.2017.ra1
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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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score 15,812429

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