scholarly journals Avian yolk androgens are metabolized rather than taken up by the embryo during the first days of incubation

2019 ◽  
Vol 222 (7) ◽  
pp. jeb193961 ◽  
Author(s):  
Neeraj Kumar ◽  
Annie van Dam ◽  
Hjalmar Permentier ◽  
Martijn van Faassen ◽  
Ido Kema ◽  
...  
Keyword(s):  
Yolk Androgens

scholarly journals Maternal yolk androgens stimulate territorial behaviour in black-headed gull chicks

2009 ◽  
Vol 5 (5) ◽  
pp. 586-588 ◽  
Author(s):  
Wendt Müller ◽  
Cor Dijkstra ◽  
Ton G. G. Groothuis
Keyword(s):  
Social Interactions ◽  
Territorial Behaviour ◽  
Social Competition ◽  
Maternal Environment ◽  
Yolk Androgens ◽  
The Social ◽  
Food Conditions ◽  
High Concentrations ◽  
Colonial Breeding ◽  
Parasite Exposure

Avian eggs contain substantial amounts of maternal androgens. The concentrations of these yolk androgens are affected by the maternal environment, such as the level of social competition, parasite exposure or food conditions. Since yolk androgens have been shown to affect a wide array of offspring traits, they may adjust the chicks to the expected post-hatching environment, but experimental evidence is still scarce. We investigate in colonial breeding black-headed gulls whether high concentrations of yolk androgens, such as those found in environments with high numbers of social interactions, facilitate aggressiveness and territorial behaviour of the chicks. Black-headed gulls are highly suitable for this, as the semi-precocial chicks defend the natal territory and food against intruders. We manipulated yolk androgen concentrations and investigated their role in both within-nest and between-nest aggression. We found that chicks hatching from androgen-treated eggs defended the natal territory more often than their nest mates from control eggs, without increasing sibling aggression. This suggests that variation in yolk androgen concentrations in relation to the social environment of the mother may indeed allow adjustment of the offspring's behaviour to the expected frequency of territorial interactions with conspecifics post-hatching.

scholarly journals The multivariate egg: quantifying within- and among-clutch correlations between maternally derived yolk immunoglobulins and yolk androgens using multivariate mixed models

Oecologia ◽  
2013 ◽  
Vol 174 (3) ◽  
pp. 631-638 ◽  
Author(s):  
Erik Postma ◽  
Heli Siitari ◽  
Hubert Schwabl ◽  
Heinz Richner ◽  
Barbara Tschirren
Keyword(s):  
Mixed Models ◽  
Yolk Androgens

scholarly journals Lesser double-collared sunbirdsNectarinia chalybeado not compensate for hatching asynchrony by adjusting egg mass or yolk androgens

2009 ◽  
Vol 40 (6) ◽  
pp. 635-639 ◽  
Author(s):  
Corine M. Eising ◽  
Raquel Robles ◽  
Maarten Lasthuizen ◽  
Ton G. G. Groothuis
Keyword(s):  
Hatching Asynchrony ◽  
Egg Mass ◽  
Yolk Androgens

Are yolk androgens adjusted to environmental conditions? A test in two seabirds that lay single-egg clutches

2008 ◽  
Vol 158 (1) ◽  
pp. 5-9 ◽  
Author(s):  
BriAnne Addison ◽  
Z. Morgan Benowitz-Fredericks ◽  
J. Mark Hipfner ◽  
Alexander S. Kitaysky
Keyword(s):  
Environmental Conditions ◽  
Yolk Androgens

scholarly journals Yolk androgens reduce offspring survival

2000 ◽  
Vol 267 (1451) ◽  
pp. 1451-1456 ◽  
Author(s):  
Keith W. Sockman ◽  
Hubert Schwabl
Keyword(s):  
Offspring Survival ◽  
Yolk Androgens

Sex-specific effects of yolk-androgens on growth of nestling American kestrels

2007 ◽  
Vol 62 (4) ◽  
pp. 617-625 ◽  
Author(s):  
Keith W. Sockman ◽  
Jack Weiss ◽  
Michael S. Webster ◽  
Vanessa Talbott ◽  
Hubert Schwabl
Keyword(s):  
Yolk Androgens ◽  
Specific Effects ◽  
American Kestrels

The effects of experimentally manipulated yolk androgens on growth and immune function of male and female nestling collared flycatchers Ficedula albicollis

2009 ◽  
Vol 40 (2) ◽  
pp. 225-230 ◽  
Author(s):  
Natalia Pitala ◽  
Suvi Ruuskanen ◽  
Toni Laaksonen ◽  
Blandine Doligez ◽  
Barbara Tschirren ◽  
...  
Keyword(s):  
Immune Function ◽  
Ficedula Albicollis ◽  
Male And Female ◽  
Yolk Androgens

Evolution of Yolk Androgens in Birds: Development, Coloniality, and Sexual Dichromatism

2007 ◽  
Vol 169 (6) ◽  
pp. 802-819 ◽  
Author(s):  
Diego Gil ◽  
Clotilde Biard ◽  
André Lacroix ◽  
Claire N. Spottiswoode ◽  
Nicola Saino ◽  
...  
Keyword(s):  
Sexual Dichromatism ◽  
Yolk Androgens

scholarly journals Yolk androgens and the development of avian immunity: an experiment in jackdaws (Corvus monedula)

2009 ◽  
Vol 212 (6) ◽  
pp. 815-822 ◽  
Author(s):  
M. I. Sandell ◽  
M. Tobler ◽  
D. Hasselquist
Keyword(s):  
Yolk Androgens ◽  
Corvus Monedula
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