Hormone-mediated maternal effects generate variation in offspring phenotype. In birds, maternal egg testosterone (T) exerts differential effects on offspring traits after hatching, suggesting that mothers experience a trade-off between contrasting T effects. However, there is very little information on T pre-natal effects. In the yellow-legged gull (Larus michahellis), we increased yolk T concentration within physiological limits and measured the effects on development and oxidative status of late-stage embryos. T-treated embryos had a larger body size but a smaller brain than controls. Males had a larger brain than females, controlling for overall size. T treatment differentially affected brain mass and total amount of pro-oxidants in the brain depending on laying order. T-treatment effects were not sex dependent. For the first time in the wild, we show contrasting T prenatal effects on body mass and brain size. Hence, T may enforce trade-offs between different embryonic traits, but also within the same trait during different developmental periods.
Contrasting effects of increased yolk testosterone content on development and oxidative status in gull embryos / M. Parolini, A. Romano, C.D. Possenti, M. Caprioli, D. Rubolini, N. Saino. - In: JOURNAL OF EXPERIMENTAL BIOLOGY. - ISSN 0022-0949. - 220:4(2017), pp. 625-633.
|Titolo:||Contrasting effects of increased yolk testosterone content on development and oxidative status in gull embryos|
PAROLINI, MARCO (Corresponding)
ROMANO, ANDREA (Secondo)
RUBOLINI, DIEGO (Penultimo)
SAINO, NICOLA MICHELE FRANCESCO (Ultimo)
|Parole Chiave:||Brain mass; Embryo; Growth; Larus michahellis; Oxidative status; Sexual dimorphism; Testosterone; Medicine (all); Physiology; Ecology, Evolution, Behavior and Systematics; Aquatic Science; Molecular Biology; Animal Science and Zoology; Insect Science|
|Settore Scientifico Disciplinare:||Settore BIO/07 - Ecologia|
|Data di pubblicazione:||2017|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1242/jeb.145235|
|Appare nelle tipologie:||01 - Articolo su periodico|