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Search Results: 1 - 10 of 149896 matches for " érika F.;Antonialli-Junior "
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First report of interspecific facultative social parasitism in the paper wasp genus Mischocyttarus Saussure (Hymenoptera, Vespidae)
Montagna, Thiago S.;Neves, érika F.;Antonialli-Junior, William F.;
Revista Brasileira de Entomologia , 2012, DOI: 10.1590/S0085-56262012005000025
Abstract: first report of interspecific facultative social parasitism in the paper wasp genus mischocyttarus saussure (hymenoptera, vespidae). parasitism of colonies of the social wasp mischocyttarus cerberus ducke, 1918 by females of mischocyttarus consimilis zikán, 1949 was observed in a rural area of dourados, state of mato grosso do sul, brazil. in all monitored cases, the invasion occurred in the pre-emergence colony stage, generally by a single female of m. consimilis. the period of establishment of the foreign female in the host colony was marked by antagonistic behaviors between the host female and the invasive. in general, the architecture of the parasitized nest was modified from the typical architecture of the host species nest.
Effect of Larval Topical Application of Juvenile Hormone on Caste Determination in the Independent-Founding Eusocial Wasp Mischocyttarus consimilis (Hymenoptera: Vespidae)  [PDF]
Thiago S. Montagna, Josué Raizer, William F. Antonialli-Junior
Open Journal of Animal Sciences (OJAS) , 2015, DOI: 10.4236/ojas.2015.52020
Abstract: Eusocial wasps are excellent models for understanding polyethism and division of labor among castes in social insects. However, little is known about the mechanisms controlling caste determination in eusocial wasps. Evidence suggests that the phenotype of queens in independent-founding (IF) eusocial wasps of the subfamily Polistinae can be partly fixed in the larval stage; however, this hypothesis has not yet been investigated. In this study we evaluate whether juvenile hormone (JH) affects pre-imaginal caste determination in the IF eusocial wasp Mischocyttarus consimilis (Hymenoptera: Vespidae). Analyzing morphometric and behavioral data, we demonstrated experimentally that females emerging from larvae that were treated with JH in the third instar had a significantly larger body size, spent more time in the nest, and were subject to less physical aggression from nestmates compared with females emerging from untreated control larvae. These results indicate that phenotype differences among castes in IF eusocial wasps can be partly fixed in the pre-adult stage and influenced by variations in the JH titer.
Nest structure and occurrence of three species of Azteca (Hymenoptera, Formicidae) in Cecropia pachystachya (Urticaceae) in non-floodable and floodable pantanal areas
Vieira, Alexsandro S.;Faccenda, Odival;Antonialli-Junior, William F.;Fernandes, Wedson D.;
Revista Brasileira de Entomologia , 2010, DOI: 10.1590/S0085-56262010000300014
Abstract: thirty cecropia pachystachya trees were examined in non-floodable and floodable areas to investigate the association between c. pachystachya and azteca ants in the pantanal of mato grosso do sul, brazil. the species azteca ovaticeps, azteca isthmica, and azteca alfari were found nesting inside domatia of c. pachystachya. a. ovaticeps was the most frequent species in the trees in the floodable area, while a. isthmica and a. alfari, in the non-floodable area. a. ovaticeps and a. isthmica maintained more entrance/exit holes in comparison to a. alfari. all azteca species maintained entrance/exit holes in the closest domatia to the apical area of the branch, due to proximity to müllerian and pearl bodies, suggesting that these species of azteca were influenced by their environment during evolution and became specialized. all internodal septa of each examined branch were perforated by ants, indicating the branches were inhabited by a single colony.
Colony cycle of the social wasp Mischocyttarus consimilis Zikán (Hymenoptera, Vespidae)
Torres, Viviana O.;Montagna, Thiago S.;Fernandes, Wedson D.;Antonialli-Junior, William F.;
Revista Brasileira de Entomologia , 2011, DOI: 10.1590/S0085-56262011000200016
Abstract: colony cycle of the social wasp mischocyttarus consimilis zikán (hymenoptera, vespidae). this study describes some aspects of the colony cycle of the neotropical social wasp mischocyttarus consimilis, from data obtained under field conditions. our results showed that the colony cycle in m. consimilis is annual and asynchronous in relation to the months of the year. the colonies remained active for approximately eight months. most of the abandonments were associated with natural causes, and were most frequent in the pre-emergence stage. the nests were constructed preferentially in man-made structures, especially in sites protected from direct sunlight and rain. colony foundation was either by haplometrosis or pleometrosis, being the first form predominant.
Efeitos da aplica??o tópica de horm?nio juvenil sobre o desenvolvimento dos ovários de larvas de operárias de Apis mellifera Linnaeus (Hymenoptera, Apidae)
Antonialli-Junior, William Fernando;Cruz-Landim, Carminda da;
Revista Brasileira de Entomologia , 2009, DOI: 10.1590/S0085-56262009000100025
Abstract: the influence of juvenile hormone (jh) on the ovarian development of worker larvae of apis mellifera was analyzed, taking into account the trophic determination of the castes. the workers control the larval feeding in order to promote caste differentiation, which is regulated by the production and availability of this hormone. the hypothesis tested was that the action of juvenile hormone is capable of protecting or preventing the degeneration of the ovaries in worker larvae. a preparation of 1 ml of juvenile hormone dissolved in hexane at a concentration of 1 mg/ml was applied topically to 2- to 5-day-old larvae. the morphology of the ovaries was evaluated on the days following the application, until the larvae were 6 days old. the controls consisted of larvae to which 1 ml of hexane was applied, and larvae that received no treatment. the effect of juvenile hormone varied according to the age of the larvae to which it was applied, and this effect was greatest in 3-day-old larvae.
Diversidade de formigas epigéicas (Hymenoptera, Formicidae) em dois ambientes no Centro-Oeste do Brasil
Soares, Stela de Almeida;Antonialli-Junior, William Fernando;Lima-Junior, Sidnei Eduardo;
Revista Brasileira de Entomologia , 2010, DOI: 10.1590/S0085-56262010000100009
Abstract: we compared, through the use of diversity indices and species abundance models, the diversity of communities of epigeous ants occurring in two different vegetational structures: native forest and eucalyptus plantation. to capture the ants, 800 soil pitfall traps were used, in eight sample series. a total of 85 species, belonging to 36 genera of seven subfamilies were collected in the two environments. of these species, 83 occurred in the native forest and 60 in the eucalyptus plantation. the species diversity as evaluated by simpson's index was not significantly different between the environments, but the shannon index indicated a higher diversity of species in the native forest. the log-series model could not be adjusted satisfactorily to the data for the ant communities from either the eucalyptus plantation or the native forest; however, the log-normal model appeared appropriate to describe the community structure in both environments. the broken-stick model, which represents a well-structured community, was only adjusted to the data for the native forest sites.
Behavioral Differentiation and Ovarian Development of Unmated Gynes, Queens, and Workers of Ectatomma vizottoi Almeida 1987 (Formicidae, Ectatomminae)
Alexsandro Santana Vieira,Wedson Desidério Fernandes,William Fernando Antonialli-Junior
Psyche , 2012, DOI: 10.1155/2012/349896
Abstract: Behavioral differentiation and ovarian development of unmated gynes, queens, and workers of Ectatomma vizottoi were investigated in laboratory conditions. Forty-one behavioral acts were identified and quantified for workers, 19 for queens and 24 for unmated gynes, for an overall species repertoire of 42 different behavioral acts. Ovipositing reproductive eggs was an exclusive task of the queen, whereas workers showed 15 caste-specific behaviors. The most important (frequent) behaviors for the queens were brood care, immobility, and reproduction, and for workers were immobility, grooming/interaction, brood care, and foraging. Unmated gynes (not winged) primarily showed immobility, brood care, grooming/interaction, and foraging. Analysis of ovarian development showed that unmated gynes had little-developed ovarioles, in contrast to queens. Queens and unmated gynes showed a clear behavioral differentiation, in which queens played the role of reproducers and unmated gynes performed activities belonging to the worker repertoire. Despite the presence of several breeding queens in the colony, functional monogyny was the rule.
Divis?o de trabalho em col?nias da vespa social neotropical Polistes canadensis canadensis Linnaeus (Hymenoptera, Vespidae)
Torres, Viviana de Oliveira;Antonialli-Junior, William Fernando;Giannotti, Edilberto;
Revista Brasileira de Entomologia , 2009, DOI: 10.1590/S0085-56262009000400008
Abstract: using "scanning sample" methods for qualifying and quantifying behavioral acts of queens and workers belonging to fifteen colonies of polistes canadensis canadensis, one hundred hours of observation were performed. a behavioral repertoire with twenty-eight acts was described, in which queens perform nineteen acts in the colony, while workers perform twenty-six, and seventeen common acts between the two castes occur. among those acts, two were exclusive to queen's repertoire and nine to worker's. chi-square test pointed significant differences between the repertoires of the two castes, where the queens remain longer in the nest and perform the intra-nidal tasks, related to the reproduction, while the workers perform more frequently tasks related to the maintenance of the colonies, such as the foraging, which demands higher risks and high energetic costs.
Aspectos bion?micos da vespa social Neotropical Polistes canadensis canadensis (Linnaeus) (Hymenoptera, Vespidae
Torres, Viviana de Oliveira;Montagna, Thiago dos Santos;Bortoluzz, Gisele;Antonialli-Junior, William Fernando;
Revista Brasileira de Entomologia , 2009, DOI: 10.1590/S0085-56262009000100028
Abstract: certain aspects of the bionomics of the neotropical social wasp polistes canadensis canadensis (linnaeus, 1758) were studied. twenty-six colonies were observed from april 2004 through july 2006, in the municipal district of mundo novo, state of mato grosso do sul, central-brazil. the results suggest that the colony phenological pattern of this species is asynchronous, and colonies may be founded or abandoned at any time of the year. the mean duration of the immature stages differed between the cold-dry and warm-rainy seasons. colonies were founded on several different kinds of substrates, but were more successful in environments that provided more-homogeneous physical conditions during the day. colonies in this species are founded by haplometrosis or pleometrosis, and pleometrotic colonies were more successful.
Modelo arquitet?nico de ninhos da formiga Ectatomma vizottoi Almeida (Hymenoptera, Formicidae)
Vieira, Alexsandro Santana;Antonialli-Junior, William Fernando;Fernandes, Wedson Desidério;
Revista Brasileira de Entomologia , 2007, DOI: 10.1590/S0085-56262007000400014
Abstract: the construction pattern and occupancy of ectatomma vizottoi was described, during november 2004-august 2006 period, in dourados, state of mato grosso do sul by excavation of eight nests. the entrance openings, or exit, have an ellipsoid shape and lead to a wide tunnel, similar to a hall, which is connected to other deeper chambers in the nest. the nests reach up to 360 cm deep and contain three to ten chambers. nests are constructed independently of plants and roots presence, and the soil of the tunnels and chambers are compacted, with specific compartments for colony deposit of detritus. the increase of the ant density led to an increase in nest depth and number of chambers, maintaining an average nest volume, which indicates a standard size for nest chambers.
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