Data from: The forgotten flies: the importance of non-syrphid Diptera as pollinators

Bees, hoverflies and butterflies are taxa frequently studied as
pollinators in agricultural and conservation contexts. Although there are
many records of non-syrphid Diptera visiting flowers, they are generally
not regarded as important pollinators. We use data from 30
pollen-transport networks and 71 pollinator-visitation networks to compare
the importance of various flower-visiting taxa as pollen-vectors. We
specifically compare non-syrphid Diptera and Syrphidae to determine
whether neglect of the former in the literature is justified. We found no
significant difference in pollen-loads between the syrphid and non-syrphid
Diptera. Moreover, there was no significant difference in the level of
specialization between the two groups in the pollen-transport networks,
though the Syrphidae had significantly greater visitation evenness. Flower
visitation data from 33 farms showed that non-syrphid Diptera made up the
majority of the flower-visiting Diptera in the agricultural studies (on
average 82% abundance and 73% species richness), and we estimate that
non-syrphid Diptera carry 84% of total pollen carried by farmland Diptera.
As important pollinators, such as bees, have suffered serious declines, it
would be prudent to improve our understanding of the role of non-syrphid
Diptera as pollinators.