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Fig. 1. Seasonal changes in physiological parameters and behaviour (daily means;
measures of variation reflect differences between individuals). Data are
double plotted to ease visualization of the annual pattern. Labels on the
x-axis indicate the first month of a two-month interval. Only
complete data sets, i.e. those with information about all parameters are
plotted. (A) Daily means of heart rate (means ± s.e.m.). (B) Daily
means of locomotor activity (means ± s.e.m.). (C) Top: daily means and
range of subcutaneous temperature; bottom: daily means of air temperature.