Conférences et séminaires » Séminaire présenté par A.M. THIERRY

Séminaire présenté par A.M. THIERRY

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Endocrine status and reproductive effort in a long-lived seabird, the Adélie penguin

Par : Anne-Mathilde THIERRY (Doctorante DEPE - Equipe Ecophysiologie fonctionnelle)
Date : Jeudi 15 septembre 2011 à 13h30
Lieu : amphithéâtre Matthias Grünewald - Bât. 25

Résumé :

nimals live in changing environments in which morphology, physiology and behaviour are regulated to maximize fitness. In particular, hormones play an important role in allowing animals to adjust their physiology and behaviour to both predictable and unpredictable changes of the environment. For example, glucocorticoids are released under life-threatening situations, such as food shortage, severe weather or predation risk, and can trigger the adoption of an emergency life-history stage. There has been much interest in understanding how long-lived seabirds optimize energy investment between reproduction and self-maintenance. Among various exogenous or endogenous factors, corticosterone (the main avian glucocorticoid) and prolactin (parental care hormone) are described as mediating resource allocation. My PhD project aims to investigate physiological mechanisms underlying breeding decisions, and determine how different hormones affect reproductive effort in a long-lived seabird species, the Adélie penguin Pygoscelis adeliae. I am particularly interested in trying to integrate the effects of hormone levels, environmental condition and body condition on behaviour and parental investment. Circulating levels of either corticosterone or prolactin of male Adélie penguins were experimentally manipulated and birds monitored throughout the breeding season. Birds’ behaviour was recorded using dummy eggs that measured egg temperature and rotation rates (during incubation) and video camera (during chick-rearing). In this clubbing, I wish to present some preliminary results, showing how elevated corticosterone or decreased prolactin levels affect penguins’ behaviour and parental investment during incubation, and how elevated corticosterone levels affect penguins’ behaviour and parental investment during the chick-rearing period.

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