-This work aimed at describing and analyzing structural and temporal parameters of communities of Euglossina in remnants of lowland forest on tertiary tabuleiro in the north Rio de Janeiro state in areas with different conservation status and anthropic infl uences. Chemical bait traps were installed from November/04 to November/05, from 8 am to 3 pm, in two sub-areas (burned and preserved) of Mata do Carvão (1053 ha) and Mata do Funil (135 ha). We collected 2,060 individuals of 11 species distributed in three genera in the burned sub-area, 894 individuals of nine species and three genera in the preserved sub-area and 1,115 individuals of 10 species distributed in four genera in Mata do Funil. The composition of species did not differ among the areas (MRPP, A = -0.015; P = 0.71). The diversity (H') obtained in the sub-area burned (H' = 1.14) and preserved (H' = 1.12) was signifi cantly higher than that described for Mata do Funil (H' = 0.98). Two peaks of abundance were observed, the larger one in the dry season. Great dominance of Euglosssa cordata (L.) (d = 0, 54) was observed in the sub-area burned and of Eulaema nigrita Lepeletier (d = 0, 55) in Mata do Funil; both species were favored for open or disturbed environments. The smaller fragment presented the lowest value of diversity, suggesting the effect of the lost of area on the community of Euglossina. Moreover, disturbed areas (burned) can be benefi ted if in connection with areas in better preservation condition.KEY WORDS: Semidecidual forest, chemical bait, forest fragmentation, Euglossine RESUMO -O objetivo deste trabalho foi descrever e analisar os parâmetros estruturais e temporais de comunidades de abelhas Euglossina em fragmentos de mata de tabuleiro terciário no norte fl uminense, sob diferentes estados de conservação e interferência antrópica. Foram instaladas armadilhas com iscas-aromáticas, de novembro/04 a novembro/05, das 8:00h às 15:00h, em duas subáreas (queimada e preservada) na Mata do Carvão (1.053 ha) e na Mata do Funil (135 ha). Foram amostrados 2.060 espécimes de três gêneros e 11 espécies na subárea queimada, 894 espécimes de três gêneros e nove espécies na subárea preservada e 1.115 espécimes de quatro gêneros e 10 espécies na Mata do Funil. A composição das espécies não diferiu signifi cativamente entre as áreas (MRPP, A = -0,015; P = 0,71). A diversidade (H') obtida nas subáreas queimada (H' = 1,14) e preservada (H' = 1,12) foi signifi cativamente maior do que a encontrada na Mata do Funil (H' = 0,98). Dois picos de abundância foram observados, sendo o maior na estação seca. Houve grande dominância de Euglossa cordata (L.) (d = 0,54) na subárea queimada e de Eulaema nigrita Lepeletier (d = 0,55) na Mata do Funil, espécies favorecidas por ambientes perturbados. O menor fragmento apresentou o menor valor de diversidade, sugerindo o efeito da perda de área sobre a comunidade de Euglossina. Além disso, áreas fortemente perturbadas (como a subárea queimada) podem ser benefi ciadas se em conexão com áreas de melhor estado de pre...

Deforestation has dramatically reduced the extent of Atlantic Forest cover in Brazil. Orchid bees are key pollinators in neotropical forest, and many species are sensitive to anthropogenic interference. In this sense understanding the matrix permeability for these bees is important for maintaining genetic diversity and pollination services. Our main objective was to assess whether the composition, abundance, and diversity of orchid bees in matrices differed from those in Atlantic forest. To do this we sampled orchid bees at 4-mo intervals from 2007 to 2009 in remnants of Atlantic Forest, and in the surrounding pasture and eucalyptus matrices. The abundance, richness, and diversity of orchid bees diminished significantly from the forest fragment toward the matrix points in the eucalyptus and pasture. Some common or intermediate species in the forest areas, such as Eulaema cingulata (F.) and Euglossa fimbriata Moure, respectively, become rare species in the matrices. Our results show that the orchid bee community is affected by the matrices surrounding the forest fragments. They also suggest that connections between forest fragments need to be improved using friendly matrices that can provide more favorable conditions for bees and increase their dispersal between fragments.

No abstract