Over 50 genera of bees release pollen from flower anthers using thoracic vibrations, a phenomenon known as buzz-pollination. The efficiency this process is directly affected by the mechanical properties buzzes, namely duration, amplitude, and frequency. Nonetheless, although effects former two are well described, role buzz frequency on remains unclear. Furthermore, nearly all existing studies describing vibrational natural buzz-pollination limited to bumblebees (Bombus) carpenter (Xylocopa)...

Eugl ossine bees (Apidae) frem Atlantic Forest sites: abundance, richness, and bi ological aspects.Co llection data of Euglossinae males from Parque Estadual do Rio Doce (PERD) Viçosa, both areas w ith remnants Rain (Mata Atlântica) in Minas Gerais state, Brazil are presented.Comparisons made among three fragments with different sizes states di sturbance fi'om Viçosa showed difterences abundance most common spec ies apparently, Eu/aema nigrita Lepeletir, 1841 can be an useful indicator...

Bemisia tabaci (Genn.) was considered a secondary pest in Brazil until 1990, despite being an efficient geminivirus vector beans and soybean. In 1991, new biotype, known as B. B biotype (=B. argentifolii) detected attacking weed plants causing phytotoxic problems Cucurbitaceae. Nowadays, is one of the most damaging whitefly pests agricultural systems worldwide that transmits more than 60 different plant viruses. Little about genetic variability these populations Brazil. Knowledge variation...

The effects of forest fragmentation on tree-hole nesting solitary wasps and bees were investigated at a site 90 km north Manaus, Brazil. Wasp bee faunas monitored in continuous terra firme forest, fragments 1, 10 100 ha, natural gaps deforested areas. These habitats studied terms abundance, richness, diversity similarity. monthly during June 1988 through 1990 by means trap-nests technique. A total 1529 nests 24 species 405 14 collected. number varied little among the habitats. genus...

The fauna of Euglossinae bees were studied in two areas terra firme continuous forest the Central Amazon. Brazil. During one year (september/1989-august/1990) collections done fortnightly, using traps with eight kinds seents baits. placed understory and tree crowns. near Manaus are among those highest speeies richness Neotropics. species was higher than that found other studies carried out Brazil also. One study area had abundance, while diversity another one. different significally between areas.

Abstract The occurrence of a kairomonal response the parasitoid Anagyrus spec. nov. near pseudococci (Hymenoptera: Encyrtidae) to (+)‐(1 R, 3 R )‐ cis ‐2,2‐dimethyl‐3‐isopropenyl‐cyclobutanemethanol acetate (PcA, namely, planococcyl acetate) and ( S )‐(+)‐lavandulyl senecioate (LS), respective female sex pheromones its hosts, citrus mealybug, Planococcus citri (Risso) vine ficus (Signoret) (Homoptera: Pseudococcidae) was investigated. Attraction tested by employing pheromone traps in field...

Biology of Centris Fabricius (Hymenoptera, Anthophoridae, Centridini) in continuous forest and fragments Central Amazonia.A study offour tree-hole nesting bee species ofCentris Fabricius, 1804 was conducted between July, 1988 June, 1990 isolated "terra firme" forests at Manaus region.Nests were obtained from wood trap-nests different diameters consisted a linear series brood cells.Centris dichrootricha (Moure, 1945) C. terminata Smith, 1874 the most abundant species.Centris nested...

Allozyme, microsatellite and random amplified polymorphic DNA (RAPD) molecular markers were used to investigate the within between population genetic variability differentiation of Brazilian stingless bee uruçu amarela (nominally Melipona rufiventris Lepeletier, 1836) present in savanna Atlantic forest habitats state Minas Gerais (MG). We found low levels variability, although there a large number private alleles that specifically characterized these populations. The F ST values indicated...

The stingless bees Melipona rufiventris and M. mondury were analyzed cytogenetically by conventional staining with Giemsa, C-banding sequential the fluorochromes CMA3/DA/DAPI. Both species presented 2n = 18 n 9, except for one colony of rufiventris, in which some individuals had 19 due to presence a B chromosome. After Giemsa chromosomes appeared very condensed high heterochromatic content, making it difficult localize centromere therefore visualize morphology. constitutive heterochromatin...

The objectives of this work were to determine the squash entomofauna in region Viçosa, Minas Gerais state, study their behavior on fl owers and importance for pollination, verifying role each pollinator.The most common species Trigona spinipes (Fabricius), hyalinata (Lepeletier), Apis mellifera (L.) Melipona quadrifasciata (Lepeletier).The visitation A. mellifera, M. quadrifasciata, Bombus morio (Swederus) similar.They visited nectar collection, positioning themselves vertically between...

Abstract Pollen types present in samples from corbiculae of Melipona capixaba (Moure and Camargo) (Hymenoptera: Apidae: Meliponina) worker bees were analyzed, as well pollen food pots inside the hives three sites located at bees' original habitat. The aim was to find out sources used a trophic resource by this species. dominant grains spectrum belonged families Myrtaceae Melastomataceae. Eucalyptus most frequent type Conceição do Castelo municipality; Eucalyptus, Myrcia,...

Pollen samples were collected in three different periods from 11 Melipona capixaba Moure & Camargo hives and analyzed with melissopalynological methodology. A total of 33 pollen types identified, which 23 genera 15 families identified. The following showed the highest richness: Fabaceae (7), Myrtaceae (3), Solanaceae Arecaceae (2), Asteraceae Euphorbiaceae Melastomataceae/Combretaceae Rubiaceae Sapindaceae (2). most frequent (>45%) Eucalyptus , generated great similarities between...

STRATlFlCATlON AND SCENTS BAITS PREFERENCES lN EUGLOSSINAE BEES (HVMENOPTERA, APlDAE).Euglossinae bees of two areas Terra Firme forest, near Manaus, Amazonas, Brazil were studied.During one year the collections done fortnight\y, using traps with eight kinds scent baits.The placed in understory and tree crowns.Some species showed a very clear vertical stratification fores!.The comparison between strata studied that fauna is more similar to other than crowns similarity crown areaswas low.Some...

Most Meliponini share a distinctive pattern of heterochromatin distribution in relation to other bees. In general, they present one euchromatic and heterochromatic chromosome arm, feature explained by minimum interaction theory, which involved centric fissions followed addition. this work, two with distinct distribution, Tetragonisca fiebrigi Melipona rufiventris, were analyzed using chromosomal microdissection the region FISH (fluorescent situ hybridization). Hybridization revealed signals...

ASPECTS DF BIDLOGV EUPLUSIA VIOUCEA (BLANCHARO) (HVMENDPTE.RA, klDAÉ, EUGWSSINI

Melipona quadrifasciata is a stingless bee widely found throughout the Brazilian territory, with two recognized subspecies, M. anthidioides, that exhibits interrupted metasomal stripes, and quadrifasciata, continuous stripes. This study aimed to estimate genetic variability of these subspecies. For this purpose, 127 colonies from 15 localities were analyzed, using nine species-specific microsatellite primers. At loci, number alleles ranged three (mean: 7.2), observed heterozygosity (Ho)...

Four colonies of the stingless bee Partamona cupira (Hymenoptera: Apidae) were cytogenetically analyzed using conventional staining and fluorochromes CMA(3) e DAPI. The females have 2n = 34 chromosomes (2K 32 M¯+2 A¯). Some females, however, presented an additional large B acrocentric chromosome, to a total 35. Chromosome chromosomal pairs 2, 9 10 showed CMA (3) (+) bands, indicating excess CG base-pairs. A clear association was verified between P. helleri chromosome SCAR marker presence in...

Due to their high degree of polymorphism, microsatellites are considered useful tools for studying population genetics. Nevertheless, studies genetic diversity in stingless bees by means these primers have revealed a low level possibly the consequence heterologous used, since most cases were not specifically designed species under consideration. Herein we compared number polymorphic loci and alleles per locus, as well observed heterozygosity Melipona rufiventris M. mondury populations, using...