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Fig. 1. Changes in (A) ambient temperature, (B) rate of oxygen consumption (O2) and (C) respiratory exchange ratio (RER) of adult ruff sandpipers. Treatment temperatures are indicated as follows: 22°C control (red triangles), 15°C (open blue diamonds), 10°C (blue circles) and 5°C (open inverted triangles). RER values were pooled (open circles) because they were not significantly different between treatments. Values are means ± S.E.M. (N=6).