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 (2000-2009) in a seasonally monogamous seabird, the king peng...
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ftdoajarticles:oai:doaj.org/article:e2a344482f734aafac5006fb95720288 2023-05-15T17:03:56+02:00 Inter-Annual Variability of Fledgling Sex Ratio in King Penguins. Célia Bordier Claire Saraux Vincent A Viblanc Hélène Gachot-Neveu Magali Beaugey Yvon Le Maho Céline Le Bohec 2014-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0114052 https://doaj.org/article/e2a344482f734aafac5006fb95720288 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4262204?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0114052 https://doaj.org/article/e2a344482f734aafac5006fb95720288 PLoS ONE, Vol 9, Iss 12, p e114052 (2014) Medicine R Science Q article 2014 ftdoajarticles https://doi.org/10.1371/journal.pone.0114052 2022-12-30T23:20:01Z 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 (2000-2009) 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 Directory of Open Access Journals: DOAJ Articles PLoS ONE 9 12 e114052 |
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Medicine R Science Q Célia Bordier Claire Saraux Vincent A Viblanc Hélène Gachot-Neveu Magali Beaugey Yvon Le Maho Céline Le Bohec Inter-Annual Variability of Fledgling Sex Ratio in King Penguins. |
topic_facet |
Medicine R Science Q |
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 (2000-2009) 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 |
Célia Bordier Claire Saraux Vincent A Viblanc Hélène Gachot-Neveu Magali Beaugey Yvon Le Maho Céline Le Bohec |
author_facet |
Célia Bordier Claire Saraux Vincent A Viblanc Hélène Gachot-Neveu Magali Beaugey Yvon Le Maho Céline Le Bohec |
author_sort |
Célia Bordier |
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 (PLoS) |
publishDate |
2014 |
url |
https://doi.org/10.1371/journal.pone.0114052 https://doaj.org/article/e2a344482f734aafac5006fb95720288 |
genre |
King Penguins |
genre_facet |
King Penguins |
op_source |
PLoS ONE, Vol 9, Iss 12, p e114052 (2014) |
op_relation |
http://europepmc.org/articles/PMC4262204?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0114052 https://doaj.org/article/e2a344482f734aafac5006fb95720288 |
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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