scholarly journals DETERMINAÇÃO DO CONSUMO DE FOLHAS DE Eucalyptus grandis POR FORMIGUEIROS DE Atta sexdens rubropilosa

FLORESTA ◽  
2013 ◽  
Vol 43 (4) ◽  
pp. 593
Author(s):  
Daniele Ukan ◽  
Nilton José Sousa ◽  
Claudiane Belinovski
Keyword(s):  
Organic Matter ◽  
Conversion Rate ◽  
Plant Material ◽  
Conversion Factor ◽  
Eucalyptus Grandis ◽  
Atta Sexdens ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting

Pelo fato de cortarem material vegetal e o transportarem para o interior de suas colônias, as saúvas tornam-se importantes agentes de acumulação de matéria orgânica no solo, por meio de suas câmaras de descarte (lixo). Esse material acumulado é oriundo do processamento do fungo simbionte e se torna uma fonte de nutrientes. Diante desse contexto, o objetivo do trabalho foi determinar a conversão de folhas de Eucalyptus grandis em resíduos, por colônias de Atta sexdens rubropilosa monitoradas em laboratório. Foram selecionadas 8 colônias de Atta sexdens rubropilosa, sendo 4 coletadas em 2007 (denominados adultos) e 4 coletadas em 2010 (denominadas jovens). Durante 72 dias, elas foram supridas com folhas de mudas de Eucalyptus grandis. A média do fator de conversão entre os formigueiros adultos e jovens monitorados em laboratório foi de 1,49. Observou-se que 63,65% do material fornecido aos formigueiros converteram-se em resíduos.Palavras-chave: Resíduos; formigas-cortadeiras; taxa de conversão. AbstractDetermination of consumption of Eucalyptus grandis by nests of Atta sexdens rubropilosa. Because ants cut and carry plant material inside their colonies, they become important agents for the accumulation of organic matter in the soil through their disposal chambers. This accumulated material comes from  symbiotic fungus processing and can become a source of nutrients. In the context, the objective of this study was to determine the conversion of leaves of Eucalyptus grandis into waste by colonies of Atta sexdens rubropilosa monitored in laboratory. We selected eight colonies of Atta sexdens rubropilosa, 4 collected in 2007 (called adults), and 4 in 2010 (referred to as young). During 72 days, they were supplied with leaves of Eucalyptus grandis. The average conversion factor between the young and adult colonies monitored in the laboratory was 1.49. We observed that 63.65% of the material supplied to the colonies converted to waste.Keywords: Waste; leaf-cutting ants; conversion rate.

scholarly journals Toxicity of sesame extracts to the symbiotic fungus of leaf-cutting ants

1990 ◽  
Vol 80 (3) ◽  
pp. 349-352 ◽  
Author(s):  
Fernando Carlos Pagnocca ◽  
Osvaldo Aulino da Silva ◽  
Maria Jose Hebling-Beraldo ◽  
Odair Correa Bueno ◽  
João Batista Fernandes ◽  
...  
Keyword(s):  
Sesamum Indicum ◽  
Atta Sexdens ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting ◽  
Leucocoprinus Gongylophorus

AbstractExtracts of different sesame plant (Sesamum indicum) Linnaeus organs inhibited the in vitro growth of the fungus Leucocoprinus gongylophorus (Möller) (=Rozites gongylophora Möller), which is cultivated by the leaf-cutting ants of the species Atta sexdens rubropilosa Forel (Hymenoptera: Formicidae). The presence of the factor responsible for this inhibition was detected in methanol or chloroform extracts and is constant in the plant.

scholarly journals A New Imidazole Alkaloid and Other Constituents from Pilocarpus grandiflorus and their Antifungal Activity

2005 ◽  
Vol 60 (7) ◽  
pp. 787-791 ◽  
Author(s):  
Rejane C. de Souza ◽  
João B. Fernandes ◽  
Paulo C. Vieira ◽  
M. Fátima das G. F. da Silva ◽  
Marizete F. P. Godoy ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Antifungal Activity ◽  
Vanillic Acid ◽  
Syringic Acid ◽  
Atta Sexdens ◽  
Spectroscopic Evidence ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting ◽  
Leucoagaricus Gongylophorus

The stems of Pilocarpus grandiflorus have afforded the new imidazole alkaloid 4,6-dehydro- 1,2,4,5-tetrahydro-2,5-dioxopilocarpine in addition to the 17 known compounds germanicol, β - amiryn, ocotillone, stigmast-4-en-3-one, 3β -hydroxy-stigmast-5-en-7-one, 6β -hydroxy-stigmast-4- en-3-one, β -sitosterol, scopoletin, 3-(1’,1’-dimethylallyl)-scopoletin, elisin, dictamine, 4-methoxy-2- quinolone, platydesmine, syringaresinol, syringaldehyde, syringic acid and vanillic acid. Their structures were elucidated on the basis of chemical and spectroscopic evidence. The phenolic compounds vanillic acid and syringaldehyde and the furoquinoline alkaloid platydesmine exhibited antifungal activity against Leucoagaricus gongylophorus, the symbiotic fungus of leaf-cutting ants (Atta sexdens rubropilosa).

Synthetic amides toxic to the leaf-cutting ant Atta sexdens rubropilosa L. and its symbiotic fungus

2006 ◽  
Vol 8 (1) ◽  
pp. 17-23 ◽  
Author(s):  
F. C. Pagnocca ◽  
S. R. Victor ◽  
F. C. Bueno ◽  
F. R. Crisostomo ◽  
T. C. Castral ◽  
...  
Keyword(s):  
Atta Sexdens ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting

scholarly journals Nest Digging by Leaf-Cutting Ants: Effect of Group Size and Functional Structures

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Roberto da Silva Camargo ◽  
Ricardo Toshio Fujihara ◽  
Luiz Carlos Forti
Keyword(s):  
Group Size ◽  
Functional Structure ◽  
Group Effect ◽  
Atta Sexdens ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Nest Digging ◽  
Leaf Cutting

Leaf-cutting ant workers dig underground chambers, for housing their symbiotic fungus, interconnected by a vast quantity of tunnels whose function is to permit the entrance of food (leaves), gaseous exchanges, and movement of workers, offspring, and the queen. Digging is a task executed by a group of workers, but little is known about the group effect and group-constructed functional structures. Thus, we analyzed the structures formed by worker groups (5, 10, 20, and 40 individuals) of the leaf-cutting ant,Atta sexdens rubropilosa, for 2 days of excavation. The digging arena was the same for the 4 groups, with each group corresponding to a different density. Our results verified a pattern of tunneling by the workers, but no chamber was constructed. The group effect is well known, since the 40-worker group dug significantly more than the groups of 5, 10, and 20. These groups did not differ statistically from each other. Analysis of load/worker verified that workers of the smallest group carried the greatest load. Our paper demonstrates the group effect on the digging of nests, namely, that excavation is proportional to group size, but without emergence of a functional structure such as a chamber.

Antibiotic-producing bacteria associated with the nests of the leaf-cutting ant Atta sexdens rubropilosa

Planta Medica ◽  
2015 ◽  
Vol 81 (11) ◽  
Author(s):  
EA Silva-Junior ◽  
CR Paludo ◽  
FS Nascimento ◽  
CR Currie ◽  
J Clardy ◽  
...  
Keyword(s):  
Atta Sexdens ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting

scholarly journals Atratividade de Atta sexdens rubropilosa por plantas de eucalipto atacadas previamente ou não por Thyrinteina arnobia

2004 ◽  
Vol 39 (3) ◽  
pp. 285-287 ◽  
Author(s):  
Hamilton Gomes de Oliveira ◽  
Fabrícia Gonçalves Lacerda ◽  
Cidália Gabriela Santos Marinho ◽  
Terezinha Maria Castro Della Lucia
Keyword(s):  
Eucalyptus Grandis ◽  
Atta Sexdens ◽  
Atta Sexdens Rubropilosa

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.

Toxic effects of leaves of Ricinus communis (Euphorbiaceae) to laboratory nests of Atta sexdens rubropilosa (Hymenoptera: Formicidae)

1996 ◽  
Vol 86 (3) ◽  
pp. 253-256 ◽  
Author(s):  
Maria José A. Hebling ◽  
Paulo Sérgio Maroti ◽  
Odair Correa Bueno ◽  
Osvaldo Aulino da Silva ◽  
Fernando Carlos Pagnocca
Keyword(s):  
Oxygen Consumption ◽  
Mortality Rate ◽  
Oxygen Consumption Rate ◽  
Consumption Rate ◽  
Ricinus Communis ◽  
Physiological Effect ◽  
Atta Sexdens ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting ◽  
The Mean

AbstractLaboratory nests of the leaf-cutting ant Atta sexdens rubropilosa Forel fed daily with leaves of Ricinus communis showed a gradual decrease in fungal garden volume, a higher ant mortality rate, and fungal garden extinction after 6 weeks. The mean oxygen consumption rate of these ants was higher than that of control ants collected from nests fed with leaves of Eucalyptus alba (Myrtaceae) suggesting one or more components of the leaves of R. communis had a direct physiological effect on the ants, in addition to inhibiting fungal garden growth.

scholarly journals Microbial Communities in Different Tissues of Atta sexdens rubropilosa Leaf-cutting Ants

2017 ◽  
Vol 74 (10) ◽  
pp. 1216-1225 ◽  
Author(s):  
Alexsandro S. Vieira ◽  
Manuela O. Ramalho ◽  
Cintia Martins ◽  
Vanderlei G. Martins ◽  
Odair C. Bueno
Keyword(s):  
Microbial Communities ◽  
Atta Sexdens ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting ◽  
Different Tissues
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