Flower-visitor species richness and abundance data

<p>Flower-visitor species richness and abundance during <i>R</i>. <i>ponticum</i> flowering (round 1, light grey bars) and after the cessation of flowering of the invasive (round 2, dark grey bars). Comparison between round 1 and 2 of a.) total insect, bumblebee, and hoverfly species richness and b.) number of visits of total insects, bumblebees, and hoverflies, c.) insect species richness to non-<i>Rhododendron</i> plants, and d.) number of visits to non-<i>Rhododendron</i> plants. Plots show mean values per round, averaged across the sites, and vertical bars show the standard error of each mean. Number of visits represents the number of floral units visited by insects, however insect abundance (number of individuals, not shown) followed the same patterns. Significant differences in the above parameters when comparing the two rounds of sampling are indicated by * (paired t-test, p < 0.05).