Pollenivory in larval and adult flower flies: pollen availability and visitation rate by Toxomerus politus Say (Diptera: Syrphidae) on sorghum Sorghum bicolor (L.) Moench (Poaceae).

摘要: The larvae and adults of both sexes Toxomerus politus SAY, 1823, were observed visiting the flowers Sorghum bicolor (L.) MOENCH (Poaceae) in Brazil, where female flies also seen ovipositing. relationship between sorghum pollen availability visitation rates was examined, as well diurnal changes sex ratio adult flowers. feeding behaviours studied. Highest occurred early morning, before 09:00, when adhering to anthers relatively small amounts air. for indicates that more females than males visit This suggests need do males, a protein source develop their reproductive organs eggs. T. found feed on pollen, records pollen-feeding syrphid are exceptionally rare. other species insectivorous. It seems from these results uses at least some Poaceae its entire life cycle.