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Varzea floodplain forests are important ecosystems of the Amazon basin. Our goal was to verify whether orchid bee males have stratum preference in a forest with a dynamic understory. Traps were placed at 25 m and 1.5 m with aromatic scents to lure the bees. Data loggers were used to register temperature and relative humidity in both heights. Of 835 sampled males belonging to 28 species, 645 males from 23 species were collected at the understory. Temperature was 1.4o C higher at the canopy and relative humidity was 11.58% higher at the understory. Temperature, relative humidity, wind and tidal levels were the most important abiotic variables influencing mainly the canopy assemblage. The understory is a more stable environment, presenting good conditions to survival of the males. The species Euglossa cognata Moure, Eulaema meriana Olivier and Euglossa ignita Smith were closely related to strata and seasons.

sociobiology

Male Orchid Bees (Hymenoptera: Apidae: Euglossini) in Canopy and Understory of Amazon Várzea Floodplain Forest. I. Microclimatic, Seasonal and Faunal Aspects