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Author |
Stier Antoine, Viblanc Vincent A, Massemin-Challet Sylvie, Handrich Yves, Zahn Sandrine, Rojas Emilio R, Saraux Claire, Le Vaillant Maryline, Prud'homme Onésime, Grosbellet Edith, Robin Jean-Patrice, Bize Pierre, Criscuolo Francois, |
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Title |
Starting with a handicap: phenotypic differences between early- and late-born king penguin chicks and their survival correlates
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Type |
Journal Article |
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Year  |
2014 |
Publication |
Functional Ecology |
Abbreviated Journal |
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Volume |
28 |
Issue |
3 |
Pages |
601-611 |
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Keywords |
corticosterone, early-life conditions, growth, individual quality, oxidative stress, phenotypic plasticity, reproductive timing, telomere, |
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Abstract |
1. The exceptionally long (c. 11 months) growth period of king penguin chicks (Aptenodytes
patagonicus) is interrupted by the Austral winter. As a consequence, penguin chicks born late
in the breeding season have little time to build-up their energy reserves before the drastic
energy bottleneck they experience during winter and face greater risks of mortality than earlyborn
chicks.
2. Whereas it is well known that breeding adults alternate between early- and late-breeding
attempts, little is known on the phenotype of early- and late-chicks, and on the potential
existence of specific adaptive phenotypic responses in late-born individuals.
3. We investigated phenotypic differences between early- and late-chicks and tested their survival
correlates both before the winter and at fledgling. Chicks were sampled 10 days after
hatching to measure body mass, plasma corticosterone levels, oxidative stress parameters and
telomere length.
4. Late-chicks were heavier than early-chicks at day 10. Late-chicks also had higher corticosterone
and oxidative stress levels, shorter telomere lengths and suffered from higher mortality
rates than early-chicks. For both early- and late-chicks, high body mass close to hatching was
a strong predictor of survival up to, and over, the winter period.
5. In late but not early-chicks, high corticosterone levels and long telomeres were significant
predictors of survival up to winter and fledging, respectively.
6. Our study provides evidence that late- and early-king penguin chicks showed marked phenotypic
differences 10 days after hatching. We provide an integrative discussion on whether
these differences may be adaptive or not, and to what extent they may be driven by active
maternal effects, indirectly induced by environmental effects, or stem from individual
differences in parental quality. |
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119 |
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ISSN |
1365-2435 |
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Notes |
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Approved |
yes |
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Call Number |
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Serial |
5667 |
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