Food subsidies shape age structure in a top avian scavenger

Human activities and recent changes in sanitary regulations are currently shaping the availability of carrion resources across ecosystems. How changes in regulations influence demographic parameters in avian scavengers is still poorly known. We combine photographic observations gathered by citizens...

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Detalles Bibliográficos
Autores: Fernández Gómez, Lola, Cortés Avizanda, Ainara, Tiago, Patricia, Byrne, Fiach, Donázar, José Antonio
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/141936
Acceso en línea:https://hdl.handle.net/11441/141936
https://doi.org/10.5751/ACE-02104-170123
Access Level:acceso abierto
Palabra clave:Demography
Farms, landfills
Griffon Vulture
Gyps fulvus
Resource predictability
Sanitary regulations
Supplementary feeding stations
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oai_identifier_str oai:idus.us.es:11441/141936
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Food subsidies shape age structure in a top avian scavenger
Les apports alimentaires déterminent la structure d'âge chez un charognard aviaire au sommet de la chaîne alimentaire
title Food subsidies shape age structure in a top avian scavenger
spellingShingle Food subsidies shape age structure in a top avian scavenger
Fernández Gómez, Lola
Demography
Farms, landfills
Griffon Vulture
Gyps fulvus
Resource predictability
Sanitary regulations
Supplementary feeding stations
title_short Food subsidies shape age structure in a top avian scavenger
title_full Food subsidies shape age structure in a top avian scavenger
title_fullStr Food subsidies shape age structure in a top avian scavenger
title_full_unstemmed Food subsidies shape age structure in a top avian scavenger
title_sort Food subsidies shape age structure in a top avian scavenger
dc.creator.none.fl_str_mv Fernández Gómez, Lola
Cortés Avizanda, Ainara
Tiago, Patricia
Byrne, Fiach
Donázar, José Antonio
author Fernández Gómez, Lola
author_facet Fernández Gómez, Lola
Cortés Avizanda, Ainara
Tiago, Patricia
Byrne, Fiach
Donázar, José Antonio
author_role author
author2 Cortés Avizanda, Ainara
Tiago, Patricia
Byrne, Fiach
Donázar, José Antonio
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Biología Vegetal y Ecología
Ministerio de Economía y Competitividad (MINECO). España
Govern de las Illes Balears
dc.subject.none.fl_str_mv Demography
Farms, landfills
Griffon Vulture
Gyps fulvus
Resource predictability
Sanitary regulations
Supplementary feeding stations
topic Demography
Farms, landfills
Griffon Vulture
Gyps fulvus
Resource predictability
Sanitary regulations
Supplementary feeding stations
description Human activities and recent changes in sanitary regulations are currently shaping the availability of carrion resources across ecosystems. How changes in regulations influence demographic parameters in avian scavengers is still poorly known. We combine photographic observations gathered by citizens and observational data from research projects in northern Spain to examine if the age structure of Eurasian Griffon Vulture (Gyps fulvus) populations at different trophic resources (natural randomly-distributed carcasses, predictable resources [supplementary feeding sites and farms], and landfills) varied in relation to modifications of sanitary regulations from 2004 onwards. We found that the proportion of immature birds increased significantly after the introduction of new European sanitary regulations allowing farmers to dispose of livestock carcasses in the field, rather than incinerating them. Also, we found that the age structure varied significantly between food resources, such that we detected a higher fraction of immatures at landfills, as well as in sites where carrion was highly clumped. These findings reveal that loss of natural randomness in carrion availability may elicit age-dependent effects on the spatial distribution of the vultures at the mesoscale which may ultimately affect population structure. Our findings shed light on challenges on how to manage food subsidies to preserve avian scavenger populations in an increasingly anthropized world.
publishDate 2022
dc.date.none.fl_str_mv 2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/141936
https://doi.org/10.5751/ACE-02104-170123
url https://hdl.handle.net/11441/141936
https://doi.org/10.5751/ACE-02104-170123
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Avian Conservation and Ecology, 17 (1), 23.
RTI2018-099609-BC21
AAEE123/2017
https://doi.org/10.5751/ACE-02104-170123
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv The Resilience Alliance
publisher.none.fl_str_mv The Resilience Alliance
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Food subsidies shape age structure in a top avian scavengerLes apports alimentaires déterminent la structure d'âge chez un charognard aviaire au sommet de la chaîne alimentaireFernández Gómez, LolaCortés Avizanda, AinaraTiago, PatriciaByrne, FiachDonázar, José AntonioDemographyFarms, landfillsGriffon VultureGyps fulvusResource predictabilitySanitary regulationsSupplementary feeding stationsHuman activities and recent changes in sanitary regulations are currently shaping the availability of carrion resources across ecosystems. How changes in regulations influence demographic parameters in avian scavengers is still poorly known. We combine photographic observations gathered by citizens and observational data from research projects in northern Spain to examine if the age structure of Eurasian Griffon Vulture (Gyps fulvus) populations at different trophic resources (natural randomly-distributed carcasses, predictable resources [supplementary feeding sites and farms], and landfills) varied in relation to modifications of sanitary regulations from 2004 onwards. We found that the proportion of immature birds increased significantly after the introduction of new European sanitary regulations allowing farmers to dispose of livestock carcasses in the field, rather than incinerating them. Also, we found that the age structure varied significantly between food resources, such that we detected a higher fraction of immatures at landfills, as well as in sites where carrion was highly clumped. These findings reveal that loss of natural randomness in carrion availability may elicit age-dependent effects on the spatial distribution of the vultures at the mesoscale which may ultimately affect population structure. Our findings shed light on challenges on how to manage food subsidies to preserve avian scavenger populations in an increasingly anthropized world.Les activités humaines et les récents changements dans la réglementation sanitaire façonnent actuellement la disponibilité des ressources en charognes dans les écosystèmes. La manière dont ces changements de réglementation influent sur les paramètres démographiques des charognards aviaires est encore mal connue. Nous avons combiné des observations photographiques recueillies par des citoyens et des données d'observation provenant de projets de recherche dans le nord de l'Espagne pour examiner si la structure d'âge des populations de Vautours fauves (Gyps fulvus) se nourrissant de ressources différentes (carcasses naturelles réparties de façon aléatoire, ressources prévisibles [sites d'alimentation supplémentaires et fermes] et décharges) a varié en fonction des modifications de la réglementation sanitaire à partir de 2004. Nous avons constaté que la proportion d'oiseaux immatures a augmenté de manière significative après l'introduction de nouveaux règlements sanitaires européens permettant aux agriculteurs d'éliminer les carcasses de bétail en les laissant dans les champs plutôt que de les incinérer. Nous avons également constaté que la structure d'âge variait de manière importante selon les ressources alimentaires : une fraction plus élevée d'immatures a été détectée dans les décharges, ainsi que dans les sites où les charognes étaient fortement concentrées. Ces résultats révèlent que la perte du caractère aléatoire naturel de la disponibilité de la charogne peut entraîner des effets dépendants de l'âge sur la répartition spatiale des vautours à l'échelle méso, ce qui peut affecter la structure de la population en fin de compte. Nos résultats mettent en lumière les défis à relever pour gérer les apports alimentaires afin de préserver les populations de charognards aviaires dans un monde de plus en plus anthropisé.Ministerio de Economía y Competitividad RTI2018-099609-BC21Govern de las Illes Balears AAEE123/2017The Resilience AllianceBiología Vegetal y EcologíaMinisterio de Economía y Competitividad (MINECO). EspañaGovern de las Illes Balears2022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/141936https://doi.org/10.5751/ACE-02104-170123reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésAvian Conservation and Ecology, 17 (1), 23.RTI2018-099609-BC21AAEE123/2017https://doi.org/10.5751/ACE-02104-170123info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1419362026-06-17T12:51:07Z
score 15,300719

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