Figure 2.

Sampling method affected the proportions of amino acids found in samples from Calluna vulgaris. (a) The mean percentage contribution of the essential amino acids (EAA) to nectar samples collected by five methods (excluding tryptophan). (b) The mean non‐essential amino acids (non‐EAAs). (c) The mean percentage of proline and glutamic acid. These amino acids were plotted separately because they were orders of magnitude greater in concentration than all the others. MC, microcapillary; FP, filter paper; MR, micro‐rinse; R, rinse 2 ml and W, wash 2 ml