Network Centrality as an Indicator for Pollinator Parasite Transmission via Flowers.

Parasites are important actors within ecosystems. However, a key aspect to unraveling parasite epidemiology is understanding transmission. The bee pollinator community harbors several multihost parasites, which have been shown to be able to spread between species via flowers. Hence the plant-pollinator network can provide valuable information on the transmission of these parasites between species. Although several controlled experiments have shown that flowers function as a transmission hub for parasites, the link with the plant-pollinator network has rarely been addressed in the field. Here, one can hypothesize that the most central flowers in the network are more likely to enable parasite transmission between species. In this study, we test this hypothesis in three local plant-pollinator networks and show that the centrality of a plant in a weighted plant-pollinator network is a good predictor of the presence of multihost pollinator parasites on the plant's flowers.