An aggregation of the oil-collecting bee Epicharis dejeanii Lepeletier was studied at Ilha das Flores, southern Brazil. Data on seasonality, types of floral resources collected, and nesting biology were registered. The nesting area occupied 120 m 2 with density of up to 8 nests/m 2. The tunnel entrances remained always open and surrounded by a tumulus. Adult activity lasted approximately 70 days. The females built the nest, provisioned food, and layed the egg in 4 days. The nest's architecture was very diverse, and they were between 40 and 140 cm in depth with one or two brood cells at the end of the tunnel. Diapause occurred in the postdefecating larval stage, and there was no cocoon. Immature stages and nest architecture are described and illustrated.

A comunidade de abelhas nativas em uma área de mata atlântica no sul do Brasil foi estudada no período 2001-2003, utilizando-se rede entomológica em plantas floridas. Foram amostrados 1.519 indivíduos de 80 espécies e 4 subfamílias de abelhas. Houve predomínio de espécies de Apinae não corbiculadas e Halictinae e de indivíduos de Apinae corbiculados e Halictinae. As plantas associadas totalizaram 124 espécies de 46 famílias, das quais as mais visitadas foram Asteraceae, Fabaceae, Lamiaceae e Melastomataceae. Foram amostradas 11 espécies de abelhas não assinaladas para Santa Catarina. As abelhas mais amostradas foram Apis mellifera, Trigona spinipes, Bombus morio, Dialictus sp., Augochloropsis sp. 07, Trigona braueri, Augochlora (Oxystoglossella) sp. 05 e Tetragonisca angustula. A quantidade de indivíduos amostrados por mês, ao longo do período de coleta, evidencia um padrão bivoltino (maio e setembro-novembro). Algumas espécies de plantas foram visitadas apenas por Apis mellifera. Os índices de diversidade e equabilidade ficaram em 2,315 e 0,528, respectivamente. A curva de acumulação mostrou-se crescente. Os estimadores de riqueza apontam mais espécies. A riqueza e a abundância evidenciam um padrão de atividade de clima temperado. A composição da apifauna demonstrou maior similaridade com formação de floresta ombrófila densa de terras baixas.

RESUMORealizou-se um levantamento da apifauna do Parque Ecológico Prefeito Rolf Colin, utilizando pratos-armadilha, iscas aromáticas e redes entomológicas, de janeiro a dezembro de 2012. Foram amostradas 557 abelhas de 49 espécies, sendo 85 nos pratos-armadilha, 71 com iscas aromáticas, 223 com redes entomológicas e 178 apenas registradas. Capturaram-se as subfamílias Apinae (68,22% de abundância), Halictinae (29,44%) e Megachilinae (2,34%), com 18, 24 e seis espécies, respectivamente. Para Euglossina, o eugenol atraiu todas as espécies coletadas, vanilina apenas duas, eucaliptol uma e as demais nenhuma (cinamato de metila, salicilato de metila e acetato de benzila ABSTRACTAiming to know the bee species assembly, a survey was carried out at Rolf Colin Ecologic Park, using pan traps (pt), aromatic baits (ab) and entomological nets (en), from January to December 2012. We sampled 49 species and 557 individuals (85 pt, 71 ab, 223 en, 178 only registered). Subfamilies of Apidae sampled were, in order of abundance: Apinae (68.22 %), Halictinae (29.44 %) and Megachilinae (2.34 %) (18, 24 and 6 species, respectively). Euglossina trap baits with eugenol attracted all species collected, vanillin two, eucalyptol one and the others, none (methyl cinnamate, methyl salicylate and benzyl acetate

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Male flowers of the wind-pollinated, dioecious shrub Boehmeria caudata Sw. release pollen explosively, possibly stimulated by anther dehydration in response to temporarily dry conditions coupled with hydrostatic pressure in the filament. In the Brazilian Atlantic rain forest, the daily frequency of male flower anthesis peaked between 1000–1200 h (GMT −3) and was positively correlated with rising temperature, wind currents, and direct insolation, but negatively correlated with relative humidity. A generalized linear mixed model predicts the probability of pollen release under different conditions of relative humidity and wind. Receptive stigmas on female flowers were found at any time of day: individual stigmas were receptive (H2O2 test) for at least two days. Beetles and halictid bees were observed feeding on pollen from staminate flowers, but probably did not affect pollination because they did not seem to visit pistillate flowers. Individual plants of this apparently ruderal species grow along road edges and show aggregated (clumped) spatial dispersion. The overall sex ratio we found was 29 females to 43 males, with one monoecious plant in a total transect distance of 6319 m. Pollen traps were placed on the female plants to measure pollen arrival. Pollen capture was higher on the more exposed road-facing side and positively related to male plant density.