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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Diel variations in plasma glucose concentrations of Malachite Sunbirds Nectarinia famosa
Auteurs :	Colleen T. Downs, Auteur ; Andrea E. Wellmann, Auteur ; Mark Brown, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (151(1) JAN 2010)
Article en page(s) :	235-239
Langues:	Anglais
Résumé :	Plasma glucose concentrations in birds are much higher than those in mammals of similar body mass, and they are thought to be kept more or less constant. We investigated plasma glucose concentrations of Malachite Sunbirds (Nectarinia famosa) to determine whether there was a circadian rhythm in plasma glucose and whether plasma glucose concentrations rose at lower temperatures. We explored the possibility that glycogenolysis and gluconeogenesis might be used by birds before daylight to generate body heat during arousal from torpor or from overnight adaptive heterothermy. Plasma glucose concentration of Malachite Sunbirds were relatively high, between 13.6 and 21.4 mmol/L. Plasma glucose concentrations were higher at 5A degrees C than at 25A degrees C, and generally lower during the scotophase, particularly in the early hours of the morning. Therefore, it appears that Malachite Sunbirds are not increasing plasma glucose concentrations during arousal from torpor or to increase scotophase body temperature levels to photophase levels. It is apparent that these nectarivorous birds have a circadian variation in plasma glucose concentrations that is affected by ambient temperature and feeding patterns.

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