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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Intestine length and mass relative to fat in migrating Redwings Turdus iliacus
Auteurs :	C. P. F. Redfern, Auteur ; G. W. Douglas, Auteur ; T. A. Halliday, Auteur
Type de document :	Article
Dans :	Ardea (90(2) FAL 2002)
Article en page(s) :	285-292
Résumé :	Redwings which died by flying into a lighthouse off North Wales, UK, while on migration were used to examine the relationship between fat levels and intestine size. The weight of claviculo-coracoid fat was used as a measure of relative fat levels. Both intestine length and claviculo-coracoid fat mass correlated with wing length, a measure of body size. Lipid-extracted dry mass of the intestine did not correlate with wing length or with intestine length; dry mass and length were therefore independent measures of intestine size. Claviculo-coracoid fat mass correlated with intestinal length in first-year females which, for this group, explained 25% of the variance in fat mass independently of body size. For all birds, claviculo-coracoid fat mass also correlated with intestine lipid-extracted dry mass, explaining 10% of variance in claviculo-coracoid fat mass independently of body size. Intestine dry mass may be a factor determining the extent of fat accumulation in individual birds, or may be correlated with fat losses during flight. However, since claviculo-coracoid fat mass correlated with intestine length in first-year female Redwings, we speculate that diet may vary according to experience and dominance interactions within feeding flocks.

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