Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities

Adult sex ratios (ASRs) have proved to correlate with population trends, which make them potential useful indicators of a species’ population trajectory and conservation status. We analysed ASRs and proportion of juveniles in flocks of an endangered steppe bird, the Little Bustard Tetrax tetrax, usi...

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Autores: Serrano-Davies, Eva, Traba, Juan, Arroyo, Beatriz, Mougeot, François, Cuscó, Francesc, Mañosa, Santi, Bota, Gerard, Faria, Nuno, Villers, Alexandre, Casas, Fabián, Attie, Carole, Devoucoux, Pierrick, Bretagnolle, Vincent, Morales, Manuel B.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Universitat de Lleida (UdL)
Repositorio:Repositori Obert UdL
OAI Identifier:oai:repositori.udl.cat:10459.1/84293
Acceso en línea:http://hdl.handle.net/10459.1/84293
Access Level:acceso abierto
Palabra clave:Female mortality
Conservation
Endangered species
Steppe birds
Western Europe
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spelling Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalitiesSerrano-Davies, EvaTraba, JuanArroyo, BeatrizMougeot, FrançoisCuscó, FrancescMañosa, SantiBota, GerardFaria, NunoVillers, AlexandreCasas, FabiánAttie, CaroleDevoucoux, PierrickBretagnolle, VincentMorales, Manuel B.Female mortalityConservationEndangered speciesSteppe birdsWestern EuropeAdult sex ratios (ASRs) have proved to correlate with population trends, which make them potential useful indicators of a species’ population trajectory and conservation status. We analysed ASRs and proportion of juveniles in flocks of an endangered steppe bird, the Little Bustard Tetrax tetrax, using surveys made during the non-breeding period in seven areas within its Western European range (one in Portugal, four in Spain, and two in France). We found overall male-biased ASRs, as all the seven surveyed areas showed a male-biased ASR mean value. Five areas were below the threshold median value (female sex ratio = 0.4) considered to be consistent with an increased probability of extinction, according to earlier population viability analyses for the species. We also found a significant positive correlation between female ratio and the proportion of young individuals in the non-breeding flocks surveyed. Our results (strongly male-biased ASRs) support the hypothesis that the viability of Little Bustard populations in Western Europe is threatened by an excess of female mortality, something that should be quantified in the future, and emphasise the value of monitoring sex ratio as a population viability indicator in species where monitoring survival is difficult to achieve.This paper is a contribution to the REMEDINAL 3 (S2013/MAE-2719) network which funded a post-doc contract for ESD. It also contributes to the Excellence Network REMEDINAL 3CM (S2013/ MAE2719), supported by Comunidad de Madrid. We thank all the field workers that collaborated in this study. Thanks to Ricardo Montero from Extremadura Birding who provided us with a Little Bustard winter flock video record. We are grateful to Julia Gómez-Catasús for her help with the bootstrapping analysis. This study was carried out with no funds from the Spanish Ministry of Science and Innovation.Cambridge University Press2022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10459.1/84293reponame:Repositori Obert UdL instname:Universitat de Lleida (UdL)InglésReproducció del document publicat a https://doi.org/10.1017/S0959270922000430Bird Conservation International, 2022, p. 1-8cc-by, (c) Serrano-Davies et al., 2022info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/oai:repositori.udl.cat:10459.1/842932026-06-24T12:42:17Z
dc.title.none.fl_str_mv Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
title Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
spellingShingle Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
Serrano-Davies, Eva
Female mortality
Conservation
Endangered species
Steppe birds
Western Europe
title_short Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
title_full Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
title_fullStr Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
title_full_unstemmed Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
title_sort Biased sex ratios in Western Europe populations of little bustard (Tetrax tetrax) as a potential warning signal of unbalanced mortalities
dc.creator.none.fl_str_mv Serrano-Davies, Eva
Traba, Juan
Arroyo, Beatriz
Mougeot, François
Cuscó, Francesc
Mañosa, Santi
Bota, Gerard
Faria, Nuno
Villers, Alexandre
Casas, Fabián
Attie, Carole
Devoucoux, Pierrick
Bretagnolle, Vincent
Morales, Manuel B.
author Serrano-Davies, Eva
author_facet Serrano-Davies, Eva
Traba, Juan
Arroyo, Beatriz
Mougeot, François
Cuscó, Francesc
Mañosa, Santi
Bota, Gerard
Faria, Nuno
Villers, Alexandre
Casas, Fabián
Attie, Carole
Devoucoux, Pierrick
Bretagnolle, Vincent
Morales, Manuel B.
author_role author
author2 Traba, Juan
Arroyo, Beatriz
Mougeot, François
Cuscó, Francesc
Mañosa, Santi
Bota, Gerard
Faria, Nuno
Villers, Alexandre
Casas, Fabián
Attie, Carole
Devoucoux, Pierrick
Bretagnolle, Vincent
Morales, Manuel B.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Female mortality
Conservation
Endangered species
Steppe birds
Western Europe
topic Female mortality
Conservation
Endangered species
Steppe birds
Western Europe
description Adult sex ratios (ASRs) have proved to correlate with population trends, which make them potential useful indicators of a species’ population trajectory and conservation status. We analysed ASRs and proportion of juveniles in flocks of an endangered steppe bird, the Little Bustard Tetrax tetrax, using surveys made during the non-breeding period in seven areas within its Western European range (one in Portugal, four in Spain, and two in France). We found overall male-biased ASRs, as all the seven surveyed areas showed a male-biased ASR mean value. Five areas were below the threshold median value (female sex ratio = 0.4) considered to be consistent with an increased probability of extinction, according to earlier population viability analyses for the species. We also found a significant positive correlation between female ratio and the proportion of young individuals in the non-breeding flocks surveyed. Our results (strongly male-biased ASRs) support the hypothesis that the viability of Little Bustard populations in Western Europe is threatened by an excess of female mortality, something that should be quantified in the future, and emphasise the value of monitoring sex ratio as a population viability indicator in species where monitoring survival is difficult to achieve.
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 http://hdl.handle.net/10459.1/84293
url http://hdl.handle.net/10459.1/84293
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a https://doi.org/10.1017/S0959270922000430
Bird Conservation International, 2022, p. 1-8
dc.rights.none.fl_str_mv cc-by, (c) Serrano-Davies et al., 2022
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
rights_invalid_str_mv cc-by, (c) Serrano-Davies et al., 2022
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Cambridge University Press
publisher.none.fl_str_mv Cambridge University Press
dc.source.none.fl_str_mv reponame:Repositori Obert UdL
instname:Universitat de Lleida (UdL)
instname_str Universitat de Lleida (UdL)
reponame_str Repositori Obert UdL
collection Repositori Obert UdL
repository.name.fl_str_mv
repository.mail.fl_str_mv
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