Navegando por Autor "Campos, Lúcio Antonio de Oliveira"

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Abelhas Euglossini (Apidae) de áreas de Mata Atlântica: abundância, riqueza e aspectos biológicos
(Revista Brasileira de Zoologia, 1999) Peruquetti, Rui Carlos; Campos, Lúcio Antonio de Oliveira; Coelho, Claudia Diniz Pinto; Abrantes, Célio Vicente Machado; Lisboa, Luciane Cristina de Oliveira
Collection data of Euglossinae males from Parque Estadual do Rio Doce (PERD) and Viçosa, both areas with remnants of Atlantic Rain Forest (Mata Atlântica) in Minas Gerais state, Brazil are presented. Comparisons made among three fragments with different sizes and states of disturbance from Viçosa showed differences in abundance of most common species and apparently, Eulaema nigrita Lepeletir, 1841 can be an useful indicator of disturbed sites. Some populations of euglossine bees seems to be restrict to a forest fragment, there being few or no flow of individuals or species of one fragment to another, even when they are only 1 km apart. 15 species of euglossines were sampled in PERD, and the most abundant was Eulaema cingulata (Fabricius, 1804). At Viçosa, 10 species were sampled, E. nigrita was the predominant one. Methyl salicylate attracted no males at both sites, in spite of large numbers of species and individuals sampled using this bait in other regions. The majority of species and individuals were collected in the rainy season. Only 0,58% of sampled males carried orchid pollinia (Catasetum Richard, Cycnoches Lindley and Coryanthes Hook) on their bodies. Emergence data of four species of Euglossa Latreille, 1802 reared from trap nests suggest that sex ratio in Euglossini is not a constant within the tribe. A list of 57 euglossine species now known to occur in Mata Atlântica are offered.
Influencia da distancia de fragmentos florestais na polinização da goiabeira
(Revista Ceres, 2005-07-08) Boti, Jacimar Berti; Campos, Lúcio Antonio de Oliveira; Marco Júnior, Paulo de; Vieira, Milene Faria
O objetivo deste estudo foi verificar se o efeito da distância de fragmentos florestais é conseqüência de maior número de polinizadores nos pomares de goiabeira (Psidium guajava L., Myrtaceae), localizados próximos dos fragmentos florestais de que naqueles distantes de mata natural. Para verificar a interferência dos insetos na polinização da goiabeira foram realizados os seguintes tratamentos: autopolinização espontânea (AE), ensacamento de 100 flores pré-antese até a queda da flor ou frutificação; e polinização aberta (PA), isto é, exposição de 100 flores etiquetadas aos visitantes florais. Foram escolhidos quatro pomares: dois próximos de fragmentos de mata e dois distantes. Os insetos que visitavam as flores foram coletados e analisados em estereomicroscópio, e anotado as observações sobre seu comportamentos na flor. As médias de frutificação obtidas nos quatro pomares (64% na AE e 90% na PA) foram significativamente diferentes a I %. Os pomares próximos aos fragmentos florestais apresentaram maior riqueza e abundância de insetos polinizadores. As abelhas mais abundantes e potenciais polinizadores foram: Apis mellifera, Trigona spinipes, Epicharis flava, Eulaema nigrita, Euglossa sp. Centris tarsata, Augochloropsis pawns e Xylocopa frontalis. Acredita-se que os fragmentos florestais sirvam de refúgio e abrigo aos insetos polinizadores.
Melittophily and ornithochory in Tilesia baccata (L.f.) Pruski: an asteraceae of the Atlantic Forest understory with fleshy fruits
(Flora - Morphology, Distribution, Functional Ecology of Plants, 2013-06-13) Fonseca, Rúbia Santos; Campos, Lúcio Antonio de Oliveira; Vieira, Milene Faria
Many Asteraceae species inhabit open vegetation areas and, as a rule, members of this family have dry, wind-dispersed fruits. Tilesia baccata, on the other hand, occurs in forested areas and, differently from all neotropical Asteraceae, has fleshy fruits with ornithochorous characteristics. However, no studies have confirmed the dispersion by birds or any other aspect of the reproductive biology of this unique Asteraceae. The present study aims to investigate the reproductive phenology, floral biology and breeding system and to identify the pollinators and seed dispersers of T. baccata. The study was carried out in a natural population located in a semideciduous forest (Viçosa, Minas Gerais State), southeastern Brazil. The reproductive cycle of T. baccata is annual and seasonal, related to precipitation, temperature and day length. The longevity of flowers and capitula depends on the performance of pollinators and dispersers. Hand pollination tests showed that the species is self-incompatible and therefore dependent on synchronous flowering and pollinator availability. Pollination occurred in the morning, in the period of pollen availability, and social bees were the major pollinator group. Seeds are dispersed by frugivorous birds, that swallow the ripe fruits and defecate viable seeds later. Our study confirmed the bird dispersal of Tilesia baccata seeds and also demonstrates that pollinator activity and fruit removal by birds influence the magnitude of activity and the intensity of flowering and fruiting.
Notes On the Structure of Silk Glands in Sphecid Wasps, Microstigmus and Psenulus (Hymenoptera, Sphecidae, Pemphredoninae)
(Netherlands Journal of Zoology, 2000) José, Eduardo Serrã; Campos, Lúcio Antonio de Oliveira
The silk glands of adult sphecid wasps, Microstigmus and Psenulus were examined by light and scanning electron microscopy to describe their structure. Silk glands in both genera were classi ed as epidermal glands of the type 3, that is they are formed by one ultinuclear terminal cell. From the terminal cell, one conducting canal runs along the body cuticle. The canals open to the exterior by means of spinnerets. These cuticular structures have different positions and forms in Microstigmus and Psenulus. The similarities in the structure of silk glands and the differences in spinnerets between these two genera con rm previous reports that silk glands evolved independently in Sphecid wasps.