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Source : DANS

Pairs of extreme avian personalities have highest reproductive success

Both, C et al. (juil. 2005)

1. Intraspecific variation in reproductive decisions is generally considered as a reaction to environmental circumstances. We show that variation in reproductive parameters also covaries with intraspecific variation in personality. 2. During 4 years, we studied reproductive parameters in a natural ...

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Source : DANS

The influence of testosterone on the development and fixation of the form of displays in two age classes of young black-headed gulls

Groothuis, Ton et al. (1992)

Young black-headed gulls, Larus ridibundus, first perform incomplete forms of display before they show the adult-like stereotyped complete form. Two hypotheses concerning the mechanism involved in the development of display were tested. (1) Experience with the performance of incomplete display is a ...

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Source : DANS

A recipe for postfledging survival in great tits Parus major: be large and be early (but not too much)

Rodríguez, Samuel et al. (2016)

Survival of juveniles during the postfledging period can be markedly low, which may have major consequences on avian population dynamics. Knowing which factors operating during the nesting phase affect postfledging survival is crucial to understand avian breeding strategies. We aimed to obtain a ...

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Source : Bib. UdeM

Rôle d'un ajout de vitamine E alimentaire dans la prévention de la myopathie du poulet de chair

Guetchom, Boniface (mars 2011)

Des études précédentes ont montré qu’une carence en vitamine E prédispose à la myopathie du poulet de chair. L’effet d’un ajout de vitamine E dans la diète commerciale sur la dégénérescence des fibres musculaires de la poitrine et de la cuisse a été étudié chez les poulets de ...

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Source : DANS

The relation among gonadal steroids, immunocompetence, body mass, and behavior in young black-headed gulls (Larus ridibundus)

Ros, AFH et al. (août 1997)

We experimentally examined the effect of testosterone on the antibody response to a single immunization with sheep red blood cells in young black-headed gulls. This species performs a number of testosterone-mediated elaborate postural displays in social interactions and breeds in dense colonies in ...

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Source : DANS

Being at the right time at the right place: interpreting the annual life cycle of Afro-Siberian red knots

Leyrer, J. (2011)

This thesis describes the possible selection pressures acting on survival and, indirectly, on reproduction of Afro-Siberian red knots Calidris canutus canutus while wintering and migrating. Afro-Siberian red knots are long-distance migrants. They travel between the West African wintering areas and ...

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Source : DANS

Foraging and its consequences in the breeding season of the Blue Tit (Parus caeruleus)

Grieco, F. (5 oct. 2001)

This dissertation deals with the direct and indirect effects of food availability in different phases of breeding in a small insectivorous bird, the Blue Tit (Parus caeruleus). Previous studies have emphasised the dual nature of food influencing reproductive decisions in birds. On the one hand, food ...

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Source : DANS

Effect of rapid modulation of circulating plasma testosterone concentration on begging, aggressive behavior and competition for food in black-headed gull (Larus ridibundus) chicks

Boncoraglio, Giuseppe et al. (août 2013)

Sibling competition mediated by begging behavior is extremely common in avian species and recent studies have highlighted the role of endogenous testosterone in regulating such phenomenon. However, current literature depicts an inconsistent pattern in altricial vs. semi-precocial species, with ...

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Source : DANS

Lesser double-collared sunbirds Nectarinia chalybea do not compensate for hatching asynchrony by adjusting egg mass or yolk androgens

Eising, Corine M. et al. (nov. 2009)

Substantial amounts of maternal androgens are found in birds' eggs and have been shown to benefit offspring development. Within-clutch patterns of increasing androgen concentrations over the laying sequence are often hypothesized to compensate for the negative effects of hatching asynchrony. However ...

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