| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Inter-Annual Variability of Fledgling Sex Ratio in King Penguins
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| Autores: |
Bordier, Celia
Saraux, Claire
Viblanc, Vincent A.
Gachot-neveu, Helene
Beaugey, Magali
Le Maho, Yvon
Le Bohec, Céline
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| Data: |
2014-12-10
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| Ano: |
2014
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| Resumo: |
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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/00248/35916/34452.pdf
DOI:10.1371/journal.pone.0114052
http://archimer.ifremer.fr/doc/00248/35916/
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| Editor: |
Public Library of Science
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| Relação: |
info:eu-repo/grantAgreement/EC/FP7/235962/EU//EVOLBIRD
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| Formato: |
application/pdf
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| Fonte: |
Plos One (1932-6203) (Public Library of Science), 2014-12-10 , Vol. 9 , N. 12 , P. 1-17
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| Direitos: |
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
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