Fig. 3. Year-round average weekly masses for 14 barnacle geese (grey circles) with rates of oxygen uptake measurements (N=6 ± s.e.m.) at six points of the year. Triangles represent night resting values and squares day resting values. X error bars represent duration of sampling period. Both day and night resting rates varied significantly throughout the year (repeated-measures ANOVA, P<0.001 and P<0.004, respectively) and followed a similar pattern. Black bar indicates the wing moult period.