Results 161 to 170 of about 1,925 (211)

Leaf-Cutting Ants, Biology and Control

2013
Leaf-cutting ants (Formicidae, Myrmicinae, Attini) are found on the American continent and in the Caribbean and are known to live in symbiosis with a fungus. Among Attini tribe, Atta and Acromyrmex are the two genera, which commonly depend on fresh plant leaves and other plant material for their fungal garden.
Boulogne, Isabelle, Ozier Lafontaine, Harry, Loranger-Merciris, Gladys   +2 more
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Hydrolytic enzymes of leaf-cutting ant fungi

Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 2009
The production of enzymes and the colonization of leaves by Leucoagaricus gongylophorus were investigated to further understand the digestive interactions of leaf-cutting ant colonies. The enzymes detected were indicative of a saprophytic origin of this fungus, producing all the enzymes necessary for plant tissue breakdown.
Milton, Erthal, Carlos Peres, Silva, Richard M, Cooper, Richard Ian, Samuels   +3 more
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Stridulation in Leaf-Cutting Ants

Science, 1965
The leaf-cutting ant Atta caphaloes L. stridulates whenever it is prevented from moving freely. Although audible to the human ear, the airborne sound produced has its main energy concentrated between 20 and 60 kilocycles per second.
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Digestive Physiology of Leaf-Cutting Ants

2019
Digestion depends, among other factors, on the quality of the ingested food and on the digestive enzyme activities of the alimentary tract. The studies carried out on the digestive physiology of Ac.octospinosus are important for research on the development of new methods of control. The digestive system of the larvae of Ac.octospinosus is comparable to
Febvay, Gérard, Kermarrec, Alice
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Occurrence of killer yeasts in leaf-cutting ant nests

Folia Microbiologica, 2002
Killer activity was screened in 99 yeast strains isolated from the nests of the leaf-cutting ant Atta sexdens against 6 standard sensitive strains, as well as against each other. Among this yeast community killer activity was widespread since 77 strains (78%) were able to kill or inhibit the growth of at least one standard strain or nest strain.
Carreiro, S. C., Pagnocca, F. C., Bacci, M., Bueno, O. C., Hebling, M. J. A., Middelhoven, W. J.   +5 more
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Toxicity of lignans to symbiotic fungus of leaf-cutting ants

Journal of Chemical Ecology, 1996
Lignans fromVirola sebifera Aubl.,Virola sp., andOtoba parvifolia (Mkfg.) A. Gentry (Myristicaceae) inhibited the in vitro growth of the fungus cultivated by leaf-cutting ants of the speciesAtta sexdens rubropilosa Forel (Hymenoptera: Formicidae). A comparison of activity among the lignans was obtained.
Odair Correa Bueno, Fernando C Pagnocca, Antonio G Ferreira   +2 more
exaly   +4 more sources

Seed Dispersal by Leaf-Cutting Ants

2003
Ants as dispersal agents represent a well-studied topic mainly in the case of myrmecochorous plants which provoke seed removal by the ‘elaiosome’, a seed-born appendage serving as protein and oil-rich food reward for the ants (Beattie 1985). This mode of dispersion is common among herbs of temperate mesic forests in the Northern Hemisphere, and woody ...
Rainer Wirth, Hubert Herz, Ronald J. Ryel, Wolfram Beyschlag, Bert Hölldobler   +4 more
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The Natural History of Leaf-Cutting Ants

2003
No one can give us an exact number of animal species living on earth today, but all biologists agree that millions more species exist than the approximately 1.5 million that have been described so far. Quantitative faunistic investigations in many habitats suggest about 8 million extant species; other assessments claim 30 million species or even more ...
Rainer Wirth, Hubert Herz, Ronald J. Ryel, Wolfram Beyschlag, Bert Hölldobler   +4 more
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Use of a Sound-Based Vibratome by Leaf-Cutting Ants

Science, 1995
Leaf-cutting ants harvest fresh vegetation that they then use as food for symbiotic fungi. When cutting leaf fragments, the ants produce high-frequency vibrations with a specialized organ located on the gaster. This stridulation behavior is synchronized with movements of the mandible, generating complex vibrations of the mandibles. The high vibrational
J, Tautz, F, Roces, B, Hölldobler
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The Economic Importance of Leaf-Cutting Ants

2019
The economically important leaf-cutting ants are restricted to the genera Atta and Acromyrmex, are fungus-growing ants of the Tribe Attini and are found only in the New World. In a questionnaire survey of 27 countries, J. M. Cherrett and D. J. Peregrine reported that 47 agricultural crops suffered leaf-cutting ant damage, and a survey of the literature
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