Inter-Annual Variability of Fledgling Sex Ratio in King Penguins
As the number of breeding pairs depends on the adult sex ratio in a monogamous species with biparental care, investigating sex-ratio variability in natural populations is essential to understand population dynamics. Using 10 years of data (20002009) in a seasonally monogamous seabird, the king pengu...
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ftarchimer:oai:archimer.ifremer.fr:35916 2023-05-15T17:03:56+02:00 Inter-Annual Variability of Fledgling Sex Ratio in King Penguins Bordier, Celia Saraux, Claire Viblanc, Vincent A. Gachot-neveu, Helene Beaugey, Magali Le Maho, Yvon Le Bohec, Céline 2014-12-10 application/pdf https://archimer.ifremer.fr/doc/00248/35916/34452.pdf https://doi.org/10.1371/journal.pone.0114052 https://archimer.ifremer.fr/doc/00248/35916/ eng eng Public Library of Science info:eu-repo/grantAgreement/EC/FP7/235962/EU//EVOLBIRD https://archimer.ifremer.fr/doc/00248/35916/34452.pdf doi:10.1371/journal.pone.0114052 https://archimer.ifremer.fr/doc/00248/35916/ 2014 Bordier et al. This is an openaccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. info:eu-repo/semantics/openAccess restricted use CC-BY Plos One (1932-6203) (Public Library of Science), 2014-12-10 , Vol. 9 , N. 12 , P. 1-17 text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1371/journal.pone.0114052 2021-09-23T20:25:44Z As the number of breeding pairs depends on the adult sex ratio in a monogamous species with biparental care, investigating sex-ratio variability in natural populations is essential to understand population dynamics. Using 10 years of data (20002009) in a seasonally monogamous seabird, the king penguin (Aptenodytes patagonicus), we investigated the annual sex ratio at fledging, and the potential environmental causes for its variation. Over more than 4000 birds, the annual sex ratio at fledging was highly variable (ranging from 44.4% to 58.3% of males), and on average slightly biased towards males (51.6%). Yearly variation in sex-ratio bias was neither related to density within the colony, nor to global or local oceanographic conditions known to affect both the productivity and accessibility of penguin foraging areas. However, rising sea surface temperature coincided with an increase in fledging sex-ratio variability. Fledging sex ratio was also correlated with difference in body condition between male and female fledglings. When more males were produced in a given year, their body condition was higher (and reciprocally), suggesting that parents might adopt a sex-biased allocation strategy depending on yearly environmental conditions and/or that the effect of environmental parameters on chick condition and survival may be sex-dependent. The initial bias in sex ratio observed at the juvenile stage tended to return to 1:1 equilibrium upon first breeding attempts, as would be expected from Fisher's classic theory of offspring sex-ratio variation. Article in Journal/Newspaper King Penguins Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) PLoS ONE 9 12 e114052 |
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Open Polar |
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Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
As the number of breeding pairs depends on the adult sex ratio in a monogamous species with biparental care, investigating sex-ratio variability in natural populations is essential to understand population dynamics. Using 10 years of data (20002009) in a seasonally monogamous seabird, the king penguin (Aptenodytes patagonicus), we investigated the annual sex ratio at fledging, and the potential environmental causes for its variation. Over more than 4000 birds, the annual sex ratio at fledging was highly variable (ranging from 44.4% to 58.3% of males), and on average slightly biased towards males (51.6%). Yearly variation in sex-ratio bias was neither related to density within the colony, nor to global or local oceanographic conditions known to affect both the productivity and accessibility of penguin foraging areas. However, rising sea surface temperature coincided with an increase in fledging sex-ratio variability. Fledging sex ratio was also correlated with difference in body condition between male and female fledglings. When more males were produced in a given year, their body condition was higher (and reciprocally), suggesting that parents might adopt a sex-biased allocation strategy depending on yearly environmental conditions and/or that the effect of environmental parameters on chick condition and survival may be sex-dependent. The initial bias in sex ratio observed at the juvenile stage tended to return to 1:1 equilibrium upon first breeding attempts, as would be expected from Fisher's classic theory of offspring sex-ratio variation. |
format |
Article in Journal/Newspaper |
author |
Bordier, Celia Saraux, Claire Viblanc, Vincent A. Gachot-neveu, Helene Beaugey, Magali Le Maho, Yvon Le Bohec, Céline |
spellingShingle |
Bordier, Celia Saraux, Claire Viblanc, Vincent A. Gachot-neveu, Helene Beaugey, Magali Le Maho, Yvon Le Bohec, Céline Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
author_facet |
Bordier, Celia Saraux, Claire Viblanc, Vincent A. Gachot-neveu, Helene Beaugey, Magali Le Maho, Yvon Le Bohec, Céline |
author_sort |
Bordier, Celia |
title |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
title_short |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
title_full |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
title_fullStr |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
title_full_unstemmed |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
title_sort |
inter-annual variability of fledgling sex ratio in king penguins |
publisher |
Public Library of Science |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00248/35916/34452.pdf https://doi.org/10.1371/journal.pone.0114052 https://archimer.ifremer.fr/doc/00248/35916/ |
genre |
King Penguins |
genre_facet |
King Penguins |
op_source |
Plos One (1932-6203) (Public Library of Science), 2014-12-10 , Vol. 9 , N. 12 , P. 1-17 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/235962/EU//EVOLBIRD https://archimer.ifremer.fr/doc/00248/35916/34452.pdf doi:10.1371/journal.pone.0114052 https://archimer.ifremer.fr/doc/00248/35916/ |
op_rights |
2014 Bordier et al. This is an openaccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. info:eu-repo/semantics/openAccess restricted use |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0114052 |
container_title |
PLoS ONE |
container_volume |
9 |
container_issue |
12 |
container_start_page |
e114052 |
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