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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ftpubmed:oai:pubmedcentral.nih.gov:4262204 2023-05-15T17:03:56+02:00 Inter-Annual Variability of Fledgling Sex Ratio in King Penguins Bordier, Célia Saraux, Claire Viblanc, Vincent A. Gachot-Neveu, Hélène Beaugey, Magali Le Maho, Yvon Le Bohec, Céline 2014-12-10 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262204 http://www.ncbi.nlm.nih.gov/pubmed/25493708 https://doi.org/10.1371/journal.pone.0114052 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/25493708 http://dx.doi.org/10.1371/journal.pone.0114052 This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2014 ftpubmed https://doi.org/10.1371/journal.pone.0114052 2014-12-21T01:00:29Z 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. Text King Penguins PubMed Central (PMC) PLoS ONE 9 12 e114052 |
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Research Article Bordier, Célia Saraux, Claire Viblanc, Vincent A. Gachot-Neveu, Hélène Beaugey, Magali Le Maho, Yvon Le Bohec, Céline Inter-Annual Variability of Fledgling Sex Ratio in King Penguins |
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Research Article |
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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 |
Text |
author |
Bordier, Célia Saraux, Claire Viblanc, Vincent A. Gachot-Neveu, Hélène Beaugey, Magali Le Maho, Yvon Le Bohec, Céline |
author_facet |
Bordier, Célia Saraux, Claire Viblanc, Vincent A. Gachot-Neveu, Hélène Beaugey, Magali Le Maho, Yvon Le Bohec, Céline |
author_sort |
Bordier, Célia |
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 |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4262204 http://www.ncbi.nlm.nih.gov/pubmed/25493708 https://doi.org/10.1371/journal.pone.0114052 |
genre |
King Penguins |
genre_facet |
King Penguins |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC http://www.ncbi.nlm.nih.gov/pubmed/25493708 http://dx.doi.org/10.1371/journal.pone.0114052 |
op_rights |
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0114052 |
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PLoS ONE |
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9 |
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12 |
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e114052 |
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