S. coronata nuts are the favored food of Lear's macaw, whose bill size and shape are particularly adapted to crack them.(del
Syagrus species are used as food plants by the larvae of some Lepidoptera species including Batrachedra nuciferae (recorded on S. coronae), Hypercompe cunigunda (feeds exclusively on S. romanzoffiana) and Paysandisia archon (recorded on S. romanzoffiana).