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Sex-specific developmental plasticity in response to yolk corticosterone in an oviparous lizard.

Artikel i vetenskaplig tidskrift
Författare Tobias Uller
Johan Hollander
Lee Astheimer
Mats Olsson
Publicerad i The Journal of experimental biology
Volym 212
Nummer/häfte Pt 8
Sidor 1087-91
ISSN 0022-0949
Publiceringsår 2009
Publicerad vid Zoologiska institutionen, ekologisk zoologi
Sidor 1087-91
Språk en
Länkar dx.doi.org/10.1242/jeb.024257
Ämnesord Animals, Body Size, Corticosterone, metabolism, pharmacology, physiology, Egg Yolk, metabolism, Embryonic Development, drug effects, Female, Lizards, anatomy & histology, embryology, metabolism, Male, Oviparity, Sex Characteristics, Sex Ratio
Ämneskategorier Terrestrisk ekologi

Sammanfattning

Corticosterone exposure during prenatal development as a result of maternal upregulation of circulating hormone levels has been shown to have effects on offspring development in mammals. Corticosterone has also been documented in egg yolk in oviparous vertebrates, but the extent to which this influences phenotypic development is less studied. We show that maternal corticosterone is transferred to egg yolk in an oviparous lizard (the mallee dragon, Ctenophorus fordi Storr), with significant variation among clutches in hormone levels. Experimental elevation of yolk corticosterone did not affect hatching success, incubation period or offspring sex ratio. However, corticosterone did have a sex-specific effect on skeletal growth during embryonic development. Male embryos exposed to relatively high levels of corticosterone were smaller on average than control males at hatching whereas females from hormone-treated eggs were larger on average than control females. The data thus suggest that males are not just more sensitive to the detrimental effects of corticosterone but rather that the sexes may have opposite responses to corticosterone during development. Positive selection on body size at hatching for both sexes in this species further suggests that increased corticosterone in egg yolk may have sex-specific fitness consequences, with potential implications for sex allocation and the evolution of hormone-mediated maternal effects.

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