Abstract
Daily field metabolic rates (FMR) during mid winter of two species of coniferous forest tits, Siberian Tit Parus cinctus and Willow Tit Parus montanus were measured with the doublylabeled water (DLW) technique north of the Arctic circle in Sweden. The Siberian Tit is approximately 10% larger than the Willow Tit. Despite this difference in body mass no significant differences in field metabolic rates between the two species were found in our sample. Both species expended 10-20% less energy than predicted by recently derived allometric equations. Northern populations of Willow Tits had significantly higher FMR
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