Influence of spatial resolution and taxonomic level on model performance
The contribution of the interacting species to the models was ranked highest at 500 m resolution (cleptoparasitic bees) and 1 km (oligolectic and polylectic bees) and at both taxonomic levels (fig. 2A; Appendix S4). The optimal resolution of 500 m for the cleptoparasitic and 1 km for the polylectic bees was significantly higher (p<0.05) compared to the other resolutions except for the difference between 500 m and 1 km, which was not significant at both taxonomic levels (Appendix S4). The oligolectic bees only showed a statistically significant difference between the optimal resolution of 1 km and the extremes (100 m and 10 km).
In general, the contribution of the interacting species to the models was higher when added at the species level for coarser resolutions and at the genus level at finer resolutions. The contribution of the interacting species was higher at the species level at a coarser resolution from 5 km to 10 km and higher at the genus level from 100 m to 1 km (fig. 2B; Appendix S4). This general trend was also shown at a resolution from 100 m to 1 km for the cleptoparasitic bees, oligolectic bees and the polylectic bees and at 5 km to 10 km resolution for the models of the cleptoparasitic bees.
The percentage contribution of the interacting species was higher for the cleptoparasitic bees compared to the oligolectic and polylectic bees. This difference was statistically different for all resolutions of the interacting species (Appendix S4). The oligolectic and polylectic bees only showed a statistically significant difference at a 10 km resolution with a higher contribution of the interacting species for the oligolectic bees.