Fig 3. Relative pollen cell emptying rate (RPCER) of different-aged stored pollen cells from colony frames during the last observation interval.

For each pollen-age class, the observed numbers of emptied and unemptied cells was compared against the numbers expected by pollen-age class abundance and overall emptying rate alone. Pollen-age classes sharing the same superscript did not significantly differ in their relative proportions of emptied and unemptied pollen cells as determined by post-hoc pairwise comparisons (chi-square test of independence, Χ²_total>9.323, df = 1, p < 0.00238 (Bonferroni-corrected significance level)).