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Registros recuperados: 24
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Activity of sesame leaf extracts against the symbiotic fungus of Atta sexdens L. Anais da SEB
Ribeiro,Stelamaris B.; Pagnocca,Fernando C.; Victor,Sandra R.; Bueno,Odair C.; Hebling,Maria J.; Bacci Jr,Mauricio; Silva,Osvaldo A.; Fernandes,João B.; Vieira,Paulo C.; Silva,Maria F. G. F..
The symbiotic fungus Leucoagaricus gongylophorus (Möller) Singer (syn. Rozites gongylophora Möller) cultivated by the leaf-cutting ant Atta sexdens L. had its development strongly inhibited by crude extracts obtained from leaves of sesame, Sesamum indicum L. (Pedaliaceae). With most of the fractions from these extracts total inhibition was observed at 2.5 mg/ml, whereas inhibition of 50% was observed with some fractions at 1.25 mg/ml. Chromatographic analysis of the hexane extract showed that it was composed by a mixture of fatty acids, of which tetradecanoic, hexadecanoic, octadecanoic, icosanoic, docosanoic and 9,12,15 octadecatrienoic acids were the major components. The separation of these compounds during the different steps of purification resulted...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Insecta; Hymenoptera; Sesame; Mutualistic fungus; Leaf-cutting ants.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80591998000300010
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Atratividade de Atta sexdens rubropilosa por plantas de eucalipto atacadas previamente ou não por Thyrinteina arnobia. Repositório Alice
OLIVEIRA, H.G. de; LACERDA, F.G.; MARINHO, C.G.S.; LUCIA, T.M.C.D..
O sistema de defesa induzido das plantas é ativado após a ocorrência do dano provocado por um herbívoro. O objetivo deste trabalho foi avaliar se plantas de eucalipto (Eucalyptus grandis) atacadas previamente por lagartas de Thyrinteina arnobia tornam-se resistentes ao corte de operárias de Atta sexdens rubropilosa. Não houve diferença significativa no tempo gasto por operárias dessa formiga em iniciar o corte em plantas atacadas ou não. Porém, houve diferença significativa no tamanho de fragmentos cortados. Concluiu-se que plantas previamente atacadas tornam-se menos atrativas para A. sexdens rubropilosa devido à ativação do seu sistema de defesa induzido.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Eucalyptus grandis; Defesa induzida; Formigas cortadeiras; Resistência de plantas a insetos; Interação inseto-planta; Lagarta; Induced defense; Leaf-cutting ants; Insect plant resistance; Insect-plant interaction; Caterpillar.
Ano: 2004 URL: http://www.alice.cnptia.embrapa.br/handle/doc/110099
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Comparison of preservation methods of Atta spp. (Hymenoptera: Formicidae) for RAPD analysis Anais da SEB
Carvalho,Alfredo O. R.; Vieira,Luiz G. E..
High quality DNA for molecular studies can be easily extracted from fresh specimens. However, live samples are difficult to keep for long periods thus making their preservation a serious problem, specially when they are collected and transported from remote locations. In order to establish an efficient method to preserve Atta spp. (leaf-cutting ants) for RAPD analysis, six different storage methods were examined: 1) -70°C; 2) 95% ethanol at -20°C; 3) 95% ethanol at 4°C; 4) 95% ethanol at room temperature; 5) silica gel at room temperature; and 6) buffer (0.25 M EDTA, 2.5% SDS, 0.5 M Tris-HCl, pH 9.2) at room temperature. DNA was extracted (Cheung et al., 1993 - modified) and examined after 90, 210 and 360 days of storage. Freshly killed specimens were used...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Insecta; Leaf-cutting ants; DNA extraction; Storage conditions.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0301-80592000000300011
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Comparison of radial growth rate of the mutualistic fungus of Atta sexdens rubropilosa forel in two culture media BJM
Miyashira,C.H; Tanigushi,D.G; Gugliotta,A.M; Santos,D.Y.A.C.
In vitro culture of the mutualistic fungus of leaf-cutting ants is troublesome due to its low growth rate, which leads to storage problems and contaminants accumulation. This paper aims at comparing the radial growth rate of the mutualistic fungus of Atta sexdens rubropilosa Forel in two different culture media (Pagnocca B and MEA LP). Although total MEA LP radial growth was greater all along the bioassay, no significant difference was detected between growth efficiencies of the two media. Previous evidences of low growth rate for this fungus were confirmed. Since these data cannot point greater efficiency of one culture medium over the other, MEA LP medium is indicated for in vitro studies with this mutualistic fungus due its simpler composition and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf-cutting ants; Mutualistic fungus growth; Mycelial growth; Leucoagaricus; Atta sexdens.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000200035
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Controle agroecológico de insetos-praga na agricultura Kaxinawá de Nova Olinda, Feijó, AC. Repositório Alice
SILVA, E. N. da; SANTOS, R. S.; SUTIL, W. P.; OLIVEIRA, J. F. A. de; VASCONCELOS, A. da S.; AZEVEDO, T. da S.; SANTANA, F. R. do C..
O povo indígena Kaxinawá é a etnia indígena que detém a maior populaçãoindígena do estado do Acre e, cujas atividades produtivas giram em torno da caça, da pesca e da agricultura. Os Kaxinawá de Nova Olinda, Feijó, AC, praticam agricultura de subsistência, sendo que qualquer perda de alimento pelo ataque de pragas causa impacto, comprometendo diretamente a quantidade e qualidade do alimento produzido.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Agroecologia; Formiga cortadeira; Conhecimento tradicional; Terra Indígena Kaxinawá de Nova Olinda (TIKNO); Feijó (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Ecologia vegetal; Agricultura de subsistência; Praga de planta; Inseto; Controle natural; Broca; Cosmopolites sordidus; Gorgulho dos cereais; Sitophilus zeamais; Agroecology; Subsistence farming; Indigenous knowledge; Plant pests; Insect pests; Control methods; Leaf-cutting ants; Atta; Agroecología; Agricultura de subsistencia; Conocimiento tradicional; Plagas de plantas; Plagas de insectos; Métodos de control; Hormigas cotadoras de hojas.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/494786
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Controle de saúvas (Atta spp.) com extrato das folhas de batata-doce (Ipomoea batatas): uma experiência promissora. Repositório Alice
MERCADANTE, M. E. G.; VOLTOLINI, L. C.; MIRA, P. M.; MORICONI, W.; RAMOS FILHO, L. O..
Resumo: A proliferação de formigas saúvas (Atta spp.) nos agroecossistemas é preocupante, uma vez que causam redução da produtividade ou mesmo inviabilizam a produção agrícola, sendo um grande gargalo para muitos agricultores. Devido à carência de dados mais sólidos na literatura referente a técnicas agroecológicas de controle, vêm sendo testadas algumas práticas no Sítio Agroecológico da Embrapa Meio Ambiente, localizada em Jaguariúna (SP). Esta experiência consiste em um conjunto de medidas, tais como: disponibilizar no entorno outras fontes de alimento para as formigas, cujo ataque não resulte em perdas econômicas; bloqueio físico dos olheiros próximos, para inibir e atrasar o trabalho das formigas; e o uso de extratos repelentes. Neste relato...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Formigas; Agroecologia; Agrofloresta; Ants; Vegetable garden; Saúva; Controle biológico; Horta; Atta; Leaf-cutting ants; Biological control; Agroecology; Agroforestry.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1106647
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Densidade e tamanho de formigueiros de Acromyrmex crassispinus em plantios de Pinus taeda. Repositório Alice
NICKELE, M.A.; REIS FILHO, W.; OLIVEIRA, E.B. de; IEDE, E.T..
O objetivo deste trabalho foi avaliar a densidade e o tamanho dos formigueiros de Acromyrmex crassispinus, ao longo do ano, em plantios de Pinus taeda de diferentes idades. Os experimentos foram realizados, em Rio Negrinho e em Três Barras, SC, em talhões de P. taeda com diferentes idades (recém-plantado, três anos e seis anos de idade). Em cada tratamento, foram demarcadas três parcelas de 1 ha. Os formigueiros foram classificados em três classes de tamanho: classe I, até 30 cm de diâmetro; classe II, 31 a 60 cm; e classe III, mais que 61 cm. A densidade de formigueiros de A. crassispinus foi menor no início do desenvolvimento da floresta, praticamente duplicou nos plantios com três anos, e reduziu quando a floresta estava com seis anos. A maior densidade...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Formicidae; Formigas cortadeiras; Praga florestal; Reflorestamentos; Leaf-cutting ants; Forest pests; Reforestation.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/118589
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Discrimination between workers of Acromyrmex subterraneus molestans from monogynous and polygynous colonies BABT
Souza,Danival José de; Lucia,Terezinha Maria Castro Della; Barbosa,Luiz Cláudio de Almeida.
Behavioral assays were conducted with individuals from monogynous and polygynous colonies of Acromyrmex subterraneus molestans to evaluate the discriminatory ability of ant workers. These bioassays showed that this subspecies could not discriminate among non-nestmates or nestmate workers. However, nestmates of these same colonies did discriminate among workers of another subspecies Ac. subterraneus subterraneus. When discrimation occurred there were no differences in the response of workers from either monogynous or polygynous colonies. Similarities or differences in the chemical profile of both subspecies explained the absence or occurence of aggressiveness among workers. The chemical profile of colonies of the same subspecies was very similar among them,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf-cutting ants; Nestmate discrimination; Polygyny.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000300013
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Dynamics of the restoration of physical trails in the grass-cutting ant Atta capiguara (Hymenoptera, Formicidae) Rev. Bras. entomol.
Caldato,Nadia; Forti,Luiz Carlos; Camargo,Roberto da Silva; Lopes,Juliane Floriano Santos; Fourcassié,Vincent.
ABSTRACT Dynamics of the restoration of physical trails in the grass-cutting ant Atta capiguara. Leaf-cutting ants of the genus Atta build long physical trails by cutting the vegetation growing on the soil surface and removing the small objects they find across their path. Little is known on the dynamics of trail construction in these ants. How much time do they need to build a trail? To answer this question we selected six trails belonging to two different nests of A. capiguara and removed on each trail a block of soil of 20 cm × 15 cm that included a portion of the physical trail. This block was then replaced by a new block of the same size that was removed in the pasture near the trail and that was uniformly covered by the same type of vegetation as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf-cutting ants; Foraging; Saúva; Social insects.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262016000100063
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Effect of the presence of brood and fungus on the nest architecture and digging activity of Acromyrmex subterraneus Forel (Hymenoptera, Formicidae) Rev. Bras. entomol.
Santos,Carlos Magno dos; Camargo,Roberto da Silva; Brugger,Mariana; Forti,Luiz Carlos; Lopes,Juliane Floriano Santos.
ABSTRACT This study investigated the stimuli that trigger digging behavior in Acromyrmex subterraneus during nest building. The hypothesis was that the presence of the fungus garden and/or brood triggers the excavation of tunnels and chambers. For the experiment, the excavation rate of individually marked workers kept in plastic cylinders filled with soil was recorded. Four treatments were applied: (1) 30 medium-sized workers, 5 g fungus garden and 30 brood items (larvae and pupae); (2) 30 medium-sized workers and 5 g fungus garden; (3) 30 medium-sized workers and 30 brood items; (4) 30 medium-sized workers without fungus and brood. After 24 h, morphological parameters of nest structure (length and width of the chambers and tunnels in cm) and the volume of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acromyrmex subterraneus; Digging behavior; Leaf-cutting ants; Nest building; Social insect.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262017000100080
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Effects of cycloheximide on the mortality of Atta sexdens leaf-cutting worker ants Rev. Bras. entomol.
Sousa,Kátia Kaelly Andrade; Camargo,Roberto da Silva; Forti,Luiz Carlos; Caldato,Nadia.
ABSTRACT Leaf-cutting ants live symbiotically with a fungus that they cultivate on the plant leaves that they cut. The innumerous studies on the plant selection mechanism used by leaf-cutting ants show the researchers’ interest in this issue. Many classical studies propose that plants are selected according to the fungus garden nutritional needs and the absence of potentially harmful substances. This hypothesis is corroborated by behavioral experiments using cycloheximide (fungicide) with citric pulp or forage plants greatly accepted by leaf-cutting ants. According to this hypothesis, under the action of a fungicide, the fungus emits an allomone that informs worker ants that some food is inadequate to its growth. Although some authors state that the...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Leaf-cutting ants; Cycloheximide; Mortality; Formicide screening.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000300169
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Formigas cultivadoras de fungos: estado da arte e direcionamento para pesquisas futuras. Repositório Alice
NICKELE, M. A.; PIE, M. R.; REIS FILHO, W.; PENTEADO, S. do R. C..
A tribo Attini (Hymenoptera: Formicidae) compreende 14 gêneros com aproximadamente 230 espécies de formigas descritas que estão envolvidas em um mutualismo obrigatório com fungos. Este fungo é cultivado no interior das colônias para a alimentação das formigas, e tem como substrato uma variedade de material orgânico. O fungo é utilizado na dieta das formigas, que em retribuição fornecem ao fungo substratos para o crescimento, proteção contra parasitas ou competidores e asseguram a sua reprodução. Embora todas as espécies da tribo cultivem fungo, essas formigas são bastante heterogêneas em relação ao sistema de agricultura, tamanho da colônia e estrutura social, métodos de cultivo do fungo, forrageamento, etc. Nesta revisão são discutidas as principais...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Agricultura; Formiga cortadeira; Simbiose; Praga; Agriculture; Attini; Leaf-cutting ants; Pest; Symbiosis.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/956104
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Fungus-farming ants: state of art and future research directions PFB - Pesquisa Florestal Brasileira
Nickele, Mariane Aparecida; Pie, Marcio Roberto; Reis Filho, Wilson; Penteado, Susete do Rocio Chiarello.
The tribe Attini (Hymenoptera: Formicidae) comprises 14 genera with approximately 230 described ant species, which are engaged in an obligate mutualism with fungi. The fungus is cultivated inside their  colonies, using a variety of organic material as substrate. The fungus is used as food by the ants, and in return, the ants nourish, protect, and disperse their fungal cultivars. Although all species of this tribe cultivate fungi, attine ants are quite heterogeneous in relation to agricultural system, colony size and social structure, substrate preparation behavior, foraging behavior, etc. Agriculture, symbiosis and natural history traits of fungus-farming ants are discussed in this review, as well as future research directions.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agriculture; Attini; Leaf-cutting ants; Pest; Symbiosis Entomologia Agricultura; Attini; Formigas cortadeiras; Simbiose; Praga.
Ano: 2013 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/403
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Growth of symbiont fungi of some higher attine ants in mineral medium Ciência Rural
Loeck,Alci Enimar; Pierobom,Carlos Roberto; Gusmão,Luciana Guerra de; Afonso,Ana Paula.
Bioassays were conducted to verify the possibility of culturing the symbiont fungus of some higher attine in mineral medium and finding out the optimum pH value for their satisfactory mycelial growth. Three organic media and one mineral medium were inoculated with isolates from Atta sexdens piriventris and Acromyrmex heyeri. In mineral medium different values of pH (4.0, 5.0, 6.0 and 7.0) were tested with isolates from A. laevigata and A. laticeps. The behavior of isolates (colony diameter) was different in the mineral medium. However, even the one which grew the least of all provided enough mycelial for RAPD analysis. The best range of pH for fungal growth in mineral medium was between 4.0 and 5.0
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf-cutting ants; Symbiont fungus; Mycelial growth.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000100012
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Harvesting of Protium heptaphyllum (Aubl.) March. seeds (Burseraceae) by the leaf-cutting ant Atta sexdens L. promotes seed aggregation and seedling mortality Rev. Bras. Bot.
Silva,Paulo D.; Leal,Inara R.; Wirth,Rainer; Tabarelli,Marcelo.
The role played by leaf-cutting ants as seed dispersers of non-myrmecochorous plants remains poorly understood. Here we document the harvesting of Protium heptaphyllum (Aubl.) March. seeds (Burseraceae) by the leaf-cutting ant Atta sexdens L. and its consequences for (1) seed deposition pattern; (2) seed germination; and (3) seedling mortality. The study was carried out at Dois Irmãos, a 390 ha reserve of Atlantic forest, northeast Brazil. Ant-seed harvesting on the ground was detected in 18.5% of all fruiting trees and ants harvested 41.1% ± 19.7% of the seed crop (mean ± s). In average, ants piled seeds 3.4 ± 2.2 m away from the trunk of parent trees and seed density in these piles reached 128.8 ± 138.8 seeds 0.25 m² during the peak of seed discarding by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic forest; Atta sexdens; Leaf-cutting ants; Protium heptaphyllum; Seed dispersal.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000300019
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Lethal and Behavioral Effects of Amazonian Plant Extracts on Leaf-Cutting Ant (Hymenoptera: Formicidae) Workers. Repositório Alice
GOUVÊA, S. M.; CARVALHO, G. A.; PICANÇO, M. C.; MORAIS, E. G. F. de; BENEVENUTE, J. S.; MOREIRA, M. D..
2010
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Leaf-cutting ants.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/928590
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Levantamento de Attini (Hymenoptera, Formicidae) em povoamento de Eucalyptus na região de Paraopeba, Minas Gerais, Brasil Zoologia
Araújo,Márcio S.; Delia Lucia,Terezinha M.C.; Mayhé-Nunes,Antonio J..
This Work was conducted in Eucalyptus stands at the Itapoã farm of the Mannesmann Fi-El Florestal Ltda. in Paraopeba, MG. The species of fungus growing-ants and leaf-cutting ants found in regrowth areas and in harvesting phase plantings were: Acromyrmex balzani Emery, 1890; Acromyrmex laticeps nigrosetosus Forel 1908; Acromyrmex subterraneus subterraneus Forel, 1893; Atta laevigala (F. Smith, 1858); Alta sexdens rubropilosa Forel, 1908; Mycocepurus goeldii Forel, 1893; Sericomyrmex sp.; Trachymyrmex fuscus Emery, 1894 and three morphospecies of Trachymyrmex Forel, 1893. Taxa belonging to the genus Atta Fabricius, 1804 represented 39.14 and 41.22% of the total number of nests found in the regrowth area and in the harvesting phase plantings, respectively....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Formicidae; Attini; Leaf-cutting ants; Eucalyptus.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000200006
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Low variation in ribosomal DNA and internal transcribed spacers of the symbiotic fungi of leaf-cutting ants (Attini: Formicidae) BJMBR
Silva-Pinhati,A.C.O.; Bacci Jr.,M.; Hinkle,G.; Sogin,M.L.; Pagnocca,F.C.; Martins,V.G.; Bueno,O.C.; Hebling,M.J.A..
Leaf-cutting ants of the genera Atta and Acromyrmex (tribe Attini) are symbiotic with basidiomycete fungi of the genus Leucoagaricus (tribe Leucocoprineae), which they cultivate on vegetable matter inside their nests. We determined the variation of the 28S, 18S, and 5.8S ribosomal DNA (rDNA) gene loci and the rapidly evolving internal transcribed spacers 1 and 2 (ITS1 and ITS2) of 15 sympatric and allopatric fungi associated with colonies of 11 species of leafcutter ants living up to 2,600 km apart in Brazil. We found that the fungal rDNA and ITS sequences from different species of ants were identical (or nearly identical) to each other, whereas 10 GenBank Leucoagaricus species showed higher ITS variation. Our findings suggest that Atta and Acromyrmex...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atta; Acromyrmex; Internal transcribed spacer; Leaf-cutting ants; Leucoagaricus; Leucoagaricus gongylophorus.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004001000004
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Occurrence of polygyny in Acromyrmex subterraneus molestans Santschi 1925 (Hymenoptera: Formicidae) Ciência Rural
Souza,Danival José de; Lino Neto,José; Lucia,Terezinha M. C. Della; Peternelli,Ethel.
Polygyny denotes the coexistence of two or more mated and fertile queens in the colony. A colony of Acromyrmex subterraneus molestans Santschi containing 14 queens was collected on campus of the Universidade Federal de Viçosa, Brazil, aiming to verify if they were all egg-layers and fertile . The volume of the fungus garden in the nest was about 500 ml with a large number of larvae and pupae. Observation of the ovarian development and spermathecae indicates that 13 queens had copulated and ovary did not show morphological differences among them. This could indicate that polygyny is not accidental and may represent an adaptative strategy to optimize the development of the initial colony in A. subterraneus molestans.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf-cutting ants; Adaptative strategy; Evolution.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000500045
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Occurrence of Winged Forms of Atta sexdens rubropilosa Forel (Hymenoptera: Formicidae) in Laboratory Colonies Neotropical Entomology
BUENO,ODAIR C.; HEBLING,MARIA J.A.; SCHNEIDER,MARCELO O.; PAGNOCCA,FERNANDO C.; BACCI JR,MAURÍCIO.
The production of hundreds of reproductive forms of Atta sexdens rubropilosa Forel in nests maintained in laboratory was observed for the first time in Brazil. Last instar male larvae were found on August 5, 2000 in a six-year-old colony with approximately 110 L of fungus garden distributed in 21 pots. Thirty to forty days later, queen larvae started to be seen. The adult sexual forms were comparable in size with those found in the field. Two apparent failed attempts of a nuptial flight were observed during the last week of October, followed by the appearance of dead males and females in the garbage piles of the colony.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf-cutting ants; Reproductive forms; Winged males; Winged females; Nuptial flight.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2002000300019
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