Penguin chicks benefit from elevated yolk androgen levels under sibling competition.

Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) hatching after the second-laid egg (B-egg) and chicks from A-eggs typically having a much lower survival probability. Maternal yolk androgens have been suggested to contribute to the competitive super...

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Autores principales:	Maud Poisbleau, Wendt Müller, David Carslake, Laurent Demongin, Ton G G Groothuis, Jeff Van Camp, Marcel Eens
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9a52b32b17d24032abd675e8ce90b46c
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spelling	oai:doaj.org-article:9a52b32b17d24032abd675e8ce90b46c2021-11-18T07:10:22ZPenguin chicks benefit from elevated yolk androgen levels under sibling competition.1932-620310.1371/journal.pone.0042174https://doaj.org/article/9a52b32b17d24032abd675e8ce90b46c2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22860073/?tool=EBIhttps://doaj.org/toc/1932-6203Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) hatching after the second-laid egg (B-egg) and chicks from A-eggs typically having a much lower survival probability. Maternal yolk androgens have been suggested to contribute to the competitive superiority of the B-chick in southern rockhopper penguins Eudyptes chrysocome, given their important role in mediating sibling competition in other species. We therefore increased the yolk androgen levels in freshly-laid eggs and examined the consequences for sibling competition--via effects on embryonic developmental times, chick growth and early survival. We placed one androgen-treated egg and one control egg into each foster nest, matching them for mass, laying date and laying order. The androgen treatment did not significantly affect embryonic developmental times or chick measurements at hatching. However, elevated yolk androgen levels benefitted chick growth in interaction with the number of siblings in a brood. Chicks from androgen-treated eggs had faster growth in the presence of a sibling than chicks from control eggs. Under these circumstances they also had a higher survival probability. Thus maternal androgens appear to reinforce the observed hatching pattern, facilitating brood reduction. This contrasts to most previous studies in other species where yolk androgens have been shown to compensate for the negative consequences of delayed hatching within the brood hierarchy.Maud PoisbleauWendt MüllerDavid CarslakeLaurent DemonginTon G G GroothuisJeff Van CampMarcel EensPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 7, p e42174 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Maud Poisbleau Wendt Müller David Carslake Laurent Demongin Ton G G Groothuis Jeff Van Camp Marcel Eens Penguin chicks benefit from elevated yolk androgen levels under sibling competition.
description	Crested penguins (genus Eudyptes) have a peculiar hatching pattern, with the first-laid egg (A-egg) hatching after the second-laid egg (B-egg) and chicks from A-eggs typically having a much lower survival probability. Maternal yolk androgens have been suggested to contribute to the competitive superiority of the B-chick in southern rockhopper penguins Eudyptes chrysocome, given their important role in mediating sibling competition in other species. We therefore increased the yolk androgen levels in freshly-laid eggs and examined the consequences for sibling competition--via effects on embryonic developmental times, chick growth and early survival. We placed one androgen-treated egg and one control egg into each foster nest, matching them for mass, laying date and laying order. The androgen treatment did not significantly affect embryonic developmental times or chick measurements at hatching. However, elevated yolk androgen levels benefitted chick growth in interaction with the number of siblings in a brood. Chicks from androgen-treated eggs had faster growth in the presence of a sibling than chicks from control eggs. Under these circumstances they also had a higher survival probability. Thus maternal androgens appear to reinforce the observed hatching pattern, facilitating brood reduction. This contrasts to most previous studies in other species where yolk androgens have been shown to compensate for the negative consequences of delayed hatching within the brood hierarchy.
format	article
author	Maud Poisbleau Wendt Müller David Carslake Laurent Demongin Ton G G Groothuis Jeff Van Camp Marcel Eens
author_facet	Maud Poisbleau Wendt Müller David Carslake Laurent Demongin Ton G G Groothuis Jeff Van Camp Marcel Eens
author_sort	Maud Poisbleau
title	Penguin chicks benefit from elevated yolk androgen levels under sibling competition.
title_short	Penguin chicks benefit from elevated yolk androgen levels under sibling competition.
title_full	Penguin chicks benefit from elevated yolk androgen levels under sibling competition.
title_fullStr	Penguin chicks benefit from elevated yolk androgen levels under sibling competition.
title_full_unstemmed	Penguin chicks benefit from elevated yolk androgen levels under sibling competition.
title_sort	penguin chicks benefit from elevated yolk androgen levels under sibling competition.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/9a52b32b17d24032abd675e8ce90b46c
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Penguin chicks benefit from elevated yolk androgen levels under sibling competition.

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