Formica-Euphorbia: ambiguous interactions

ant-euphorbiaI photographed this ant hanging on a Euphorbia flower in Bellwald, Switzerland. The ant probably belongs to the genus Formica, and the plant seems E. cyparissias.
Since my time in Madagascar I pay much more attention to flowers and pollinators than I used to do. I guessed that the ant was probably foraging on the flowers, but the pollen grains on its head and abdomen suggested that it could also act as a pollinator: what was it then, herbivore or pollinator? “Good” interactor or “bad” interactor? Continue reading