Do robbing levels vary spatially and/or temporally within and among species?
To examine how robbing levels varied spatially and temporally for D. nuttallianum, I. aggregata, and L. vulgaris, we used a repeated measures ANOVA with site (random effect) and year as main factors and bloom week as the repeated term. Robbing level (arcsine-square root transformed) was used as the response variable here, as well as for all analyses below. Year was not included in the model for D. nuttallianum because weekly robbing levels were only measured in one season, and site was not included in the model for L. vulgaris because weekly robbing levels were only measured in one site. For L. vulgaris robbing data collected in 2000, we measured robbing in multiple sites at one point in the season; in this case we used an ANOVA with site (random effect) as the main factor. Finally, for C. caseana, we used an ANOVA to compare levels of nectar robbing among sites (random effect) and years. To compare how robbing levels varied among species, we calculated the mean peak robbing level for
