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Intestine length and mass relative to fat in migrating Redwings Turdus iliacus

Lookup NU author(s): Dr Chris Redfern

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Abstract

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.


Publication metadata

Author(s): Redfern, C.P.F., Douglas, G., Halliday, T.

Publication type: Article

Publication status: Published

Journal: Ardea

Year: 2002

Volume: 90

Issue: 2

Pages: 285-292

Print publication date: 01/01/2002

ISSN (print): 0373-2266

ISSN (electronic):


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