Sugar content of nectar brought back to the hives by returning foragers.

<p>Median sugar content is highest in May, September, and October and is lowest in March, April, and June to August. The third quartile is higher in spring than summer. Letters display post-hoc results, where months that share letters do not significantly differ. Statistics were done on transformed data, but the Figure displays the untransformed data. Box lines report medians and lower and upper quartiles, and whiskers extend to either maximum and minimum data points or to 1.5 times the interquartile range. Breaks in the x axis indicate winter, when there is little or no foraging. Colours per month are consistent between figures, with the exception of <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0093495#pone-0093495-g004" target="_blank">Figure 4</a> heatmap.