Flower visitation
Addition of sugar-water increased flower visitation rate (est=0.36,
se=0.11, p=0.01) and the proportion of legitimate visits (est=10.4,
se=2.6, p<0.01) as expected. Despite a low flower visitation
rate (mean=0.03, sd=0.08, min=0, max=0.66 visits per flower per 10 min)
and no effect of herbivory on visitation rate (est=- 0.05, se=0.04,
p=0.31), there was a negative effect of herbivory on proportion of
legitimate flower visits by B. terrestris (mean±se=0.006±0.005%,
est=-2.03, se=0.89, p=0.022,
R2m=0.05), due to higher proportions
of EFN visits (mean±se=84±4.3%, est=1.34, se=0.53, p=0.011,
R2m=0.11) but not robbing
(mean±se=4.2±1.6%, est=-1.47, se=0.81, p=0.07) (Fig. 3). While nectar
robbing increased with the number of open flowers per
m2 (est=0.02, se=0.01, p=0.03, Fig. S6), visitation
rate and proportion of legitimate visitation were negatively affected by
the number of open flowers per m2 but primarily after
sugar-water was added (interaction term: visitation rate est=-0.004,
se=0.002, p=0.073, R2m=0.10;
proportion of legitimate visits est=-0.09, se=0.04, p=0.039,
R2m=0.42) (Fig. S6). However, there
was no effect of herbivory on number of open flowers per
m2 (est=- 4.69, se=5.55, p=0.43,
R2m=0.01).