La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Insulin-like growth factor 1 relieves the constraints on the growth of young wild passerines (2018)
Auteurs :	Jaanis Lodjak, Auteur ; Marko Magi, Auteur
Type de document :	Article
Dans :	Ibis (160(3) June, 2018)
Article en page(s) :	688-692
Langues:	Anglais
Mots-clés:	exogenous insulin-like growth factor 1 ; life-history ; phenotypic plasticity ; physiology ; trade-off
Résumé :	To gain a selective advantage for survival in stochastic environments, the growth of different body parameters of juvenile animals should be constantly adjusted according to prevailing conditions. Hormones, especially insulin-like growth factor 1 (IGF-1), are an important part of physiological mechanisms mediating life-history variability in free-living animals when connecting available resources (e.g. food) with pathways of somatic growth. We used an IGF-1 injection treatment in free-living European Pied Flycatcher Ficedula hypoleuca nestlings to mimic experimentally the differentiation of growth conditions for chicks with a similar genetic background. We showed that there is probably a physiological trade-off for young animals between the growth rates of structural size and body mass, where IGF-1 could be part of the physiological modulatory system of this trade-off. By weakening internal constraints that limit growth, IGF-1 could help to relieve the trade-off between these competing body size parameters.
En ligne :	https://onlinelibrary.wiley.com/doi/abs/10.1111/ibi.12608

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