Seasonality and Seasonal Changes in Preferences for Scent Baits in Euplusia violacea in Rio Grande do Sul/Brazil (Hymenoptera: Apidae: Euglossini)
Wittmann, Dieter; Radtke, Rainer; Hoffmann, Magali; Blochtein, Betina
In Rio Grande do Sui, at the S'distributional limit of euglossine bees in Brazil, Euplusia violacea (Blanchard 1840) is the most abundant species. During a census at 3 study sites in the Atlantic rain forest and 3 sites in the subtropical rain forest males of this species occurred at scent baits (vanillin, cineole and scatole) for a single period of about 90 days. At all study sites, with aereal distances of up to 500 km inbetween them, these bees showed no significant local differences in their preferences for the baits. However, repeated monitoring during 2 seasons at one study site revealed that the initial preference for vanillin shifted towards cineole throughout each season. The possible significance of these changes in preferences for chemical fragrances is discussed.