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X

CHAPITRE IV------------------------------------------------------93

Comment la flexibilite de la composition corporelle reflete-t-elle les variations de la performance metabolique chez un petit passereau hivernant sous les hautes latitudes ?    93

4.1    Rćsumć.....................................................................................................................96

4.2    Abstract....................................................................................................................97

4.3    Introduction..............................................................................................................98

4.4    Materials and methods............................................................................................100

4.4.1    Capture and handling.....................................................................................100

4.4.2    Respirometry.................................................................................................100

4.4.3    Organ mass...................................................................................................102

4.4.4    Statistical analysis.........................................................................................103

4.5    Results....................................................................................................................106

4.5.1    Seasonal variation in body mass and metabolic performance.........................106

4.5.2    Seasonal variation in lean dry organ mass.......................................................109

4.6    Discussion..............................................................................................................113

4.6.1    Seasonal variation in body mass and metabolic performance............................114

4.6.2    Variation in organ mass between sexes............................................................115

4.6.3    Variation in organ mass and relationships with BMR.......................................115

4.6.4    Variation in organ mass and relationships with Msum......................................117

CHAPITRE V--------------------------------------------------121

L’augmentation hirernale de la capacitć thermogeniąue favorise la survie intra-hivernale des oiseaux de petite taille    121

5.1    Rćsumć...................................................................................................................124

5.2    Abstract..................................................................................................................125

5.3    Introduction............................................................................................................126

5.4    Materials and methods............................................................................................127

5.4.1    Capture and handling.....................................................................................127

5.4.2    Respirometry.................................................................................................128

5.4.3    Capture-Mark-Recapture (CMR) method.......................................................130