Entity

Time filter

Source Type


Rabelo L.S.,Federal University of Uberlandia | Vilhena A.M.G.F.,Federal University of Uberlandia | Bastos E.M.A.F.,Laboratorio Of Recursos Vegetais E Opoterapicos | Aguiar C.M.L.,State University of Feira de Santana | Augusto S.C.,Federal University of Uberlandia
Apidologie | Year: 2015

Pollination is an ecosystem service sustained by a differentiated use of resources among sympatric species. The bee size can influence the similarity in the use of resources, and poricidal anthers limit the access to pollen. Therefore, we evaluated the influence of body size and the anther type of pollen sources in Centridini–flower interaction network. We expected that the low niche overlap, promoted by these morphological parameters, would result in the formation of subgroups and lead to greater network resilience. We studied 15 bee species (n = 73 females) and identified their pollen sources. The bee size and anther type influenced the formation of subgroups in the community, and the larger bees used a higher proportion of flowers with poricidal anthers. Only the anther type influenced the robustness of the network. We conclude that the parameters analyzed influence both the use of resources by oil-collecting bees and their food niche breadth. © 2014, INRA, DIB and Springer-Verlag France. Source


Rabelo L.S.,Federal University of Uberlandia | Vilhena A.M.G.F.,Federal University of Uberlandia | Bastos E.M.A.F.,Laboratorio Of Recursos Vegetais E Opoterapicos | Augusto S.C.,Federal University of Uberlandia
Journal of Natural History | Year: 2014

We identified the food niche breadth of two sympatric species of oil-collecting bees, Centris (Heterocentris) analis (Fabricius, 1804) and Centris (Hemisiella) tarsata Smith, 1874, based on pollen analyses of larval food. We tested differences in the use of pollen sources considering the anther type and pollen size of the flowers. The species presented a low similarity in the use of pollen sources and C. analis had a wider niche breadth than C. tarsata. Centris analis mainly used Heteropterys spp. and other flowers with non-poricidal anthers. In contrast, C. tarsata commonly used Solanum lycocarpum A. St.-Hil., as well as other flowers with poricidal anthers. Despite the differences in pollen composition of larval food, both species predominantly used medium-sized pollen grains. Although C. analis and C. tarsata are sympatric species, belonging to the same functional group and presenting an overlap in nesting periods, they used different pollen sources, which suggests the occurrence of food niche partitioning. © 2014 Taylor & Francis. Source


Rabelo L.S.,Federal University of Uberlandia | Bastos E.M.A.F.,Laboratorio Of Recursos Vegetais E Opoterapicos | Augusto S.C.,Federal University of Uberlandia
Journal of Natural History | Year: 2016

Exomalopsis are ground-nesting species, and their food-niche breadth is little known due the difficulty in locating the nests and finding efficient bait plants to attract these bees. Some species of Exomalopsis were recorded as tomato, hot pepper and eggplant pollinators. Information about the food niche could be useful to increase Exomalopsis populations, providing consistent and comparable data for the enrichment of natural and crop areas with adequate plant sources. This study aimed to determine the food niche and the role of pollen size in the diet of E. fulvofasciata. We analysed pollen loads of 28 individuals of E. fulvofasciata collected from bait plants, in two natural areas of the Brazilian savannah. Only five pollen types belonging to the families Malpighiaceae, Solanaceae, Leguminosae, Myrtaceae and Lythraceae were important for this species. This result indicates that E. fulvofasciata is probably a polylectic species. However, we noticed that the Byrsonima used as bait plants contribute significantly for its larval provision, indicating that small pollen grains were more frequently collected. © 2016 Informa UK Limited, trading as Taylor & Francis Group Source


Bittencourt N.S.,Sao Paulo State University | Bittencourt N.S.,Federal University of Vicosa | Pereira E.J.,Sao Paulo State University | de Souza Sao-Thiago P.,Federal University of Vicosa | And 2 more authors.
Flora: Morphology, Distribution, Functional Ecology of Plants | Year: 2011

Bignoniaceous woody species are very important ecological components of neotropical forests, but the reproductive biology of many species, such as Cybistax antisyphilitica, remains virtually unknown. Most species of Bignoniaceae are characteristically self-sterile, despite typically exhibiting normal pollen tube growth throughout the style, combined with slow rates of ovule penetration, fertilisation and endosperm initiation in selfed pistils. Uniform abortion occurs within a few days of anthesis, indicating the occurrence of late-acting self-incompatibility (LSI). However, breeding system studies have been performed in fewer than 7% of species, and other types of breeding systems (e.g., self-compatibility and apomixis) have been reported in this family. In the present study, the reproductive biology of C. antisyphilitica was investigated by field observation of flower visitors and floral events. Moreover, reproductive biology of this species was examined through experimental pollinations, analyses of pollen tube growth and ovule penetration using fluorescence microscopy, verification of pistil longevity, and a histological analysis of unpollinated vs. self-pollinated pistils. Finally, morphological aspects, quantities and germination were investigated in seeds that resulted from different pollination treatments. Natural pollination was effected by large- and medium-sized bees, and their visiting behaviour favours a high proportion of geitonogamy and no pollen limitation. Self-pollinated flowers produced no fruits, and all of the characteristic post-pollination events cited above were verified, witnessing the occurrence of LSI with post-zygotic rejection of selfed pistils in C. antisyphilitica. Although some indications of extended pistil longevity were found in selfed pistils, this feature seemed to be affected by unidentified environmental factors. The seeds were always monoembryonic and with high viability. A larger variation in the number of viable seeds was found in fruits derived from natural pollination. A low fruit set was observed after both natural and cross-pollination, and most crossed fruits underwent abortion at several points during the juvenile phase, even when protected against herbivory. The formation of surplus flowers/juvenile fruits and the apparently wasteful selfing mechanism control implied in LSI are discussed in the context of the perennial life style of tropical woody plant species. © 2011 Elsevier GmbH. Source


Daniel H.-M.,Catholic University of Louvain | Rosa C.A.,Federal University of Minas Gerais | Thiago-Calaca P.S.S.,Laboratorio Of Recursos Vegetais E Opoterapicos | Antonini Y.,Federal University of Ouro Preto | And 6 more authors.
International Journal of Systematic and Evolutionary Microbiology | Year: 2013

A novel yeast species was found repeatedly and in high cell densities in underground-nesting stingless bees of the species Melipona quinquefasciata and their provisions in northern Minas Gerais (Brazil). One additional strain was isolated from bee-collected pollen in Cuba. Phylogenetic analyses based on rRNA gene sequences (D1/D2 large subunit gene and internal transcribed spacer) indicated that the novel species belongs to the Starmerella clade and is most closely related to Candida (iter. nom. Starmerella) apicola. Growth reactions on carbon and nitrogen sources were typical of those observed in related species of the Starmerella clade. PCRfingerprinting with mini- and microsatellite specific primers allowed the distinction of the novel species from Candida apicola, Candida bombi and a yet undescribed species represented by strain CBS 4353. On the basis of phylogenetic relationships, the novel species is assigned to the genus Starmerella despite the failure to observe sexual reproduction after extensive mating tests. We propose the name Starmerella neotropicalis f. a., sp. nov. (Mycobank MB 804285) and designate UFMG PST 09T (=MUCL 53320T=CBS 12811T) as the type strain. © 2013 IUMS. Source

Discover hidden collaborations