Contribuição para. o conhecimento da "saúva parda" Atta capiguara Gonçalves, 1944

Mariconi, F. A. M.; Zamith, Adiel P. L.; Castro, Urbano de Paiva

doi:10.1590/s0071-12761961000100020

Cited by 12 publications

(15 citation statements)

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“…A. capiguara is a shade intolerant grass-cutting ant (Mariconi 1970) that is found in the grasslands of southern Brazil and eastern Paraguay. This species constructs diffuse nests, characterized by multiple tumuli of excavated soil dispersed over tens of square meters (Amante 1964).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Mature Colony Density on Colonization and Initial Colony Survivorship in Atta capiguara, a Leaf-Cutting Ant

Fowler¹,

Robinson²,

Diehl³

1984

Biotropica

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Section: Introductionmentioning

confidence: 99%

“…This species constructs diffuse nests, characterized by multiple tumuli of excavated soil dispersed over tens of square meters (Amante 1964). Colonies are initiated by a solitary queen (haplometrosis) (Mariconi 1970), and early colony growth has been studied by Mariconi (1974), and Pereira da Silva et al (1982). km east of Asuncion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mature Colony Density on Colonization and Initial Colony Survivorship in Atta capiguara, a Leaf-Cutting Ant

Fowler¹,

Robinson²,

Diehl³

1984

Biotropica

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“…As long as neither of these criteria is met, the queen is expected to continue enlarging the tunnel. The variability in the tunnel lengths measured for several Atta species in the field [7.5-12cm in A. colombica (Weber, 1972); 6.5-13cm in A. cephalotes (Weber, 1937); 15-25cm in A. texana (Moser, 1967); 20-40cm in A. sexdens (Ihering, 1898); 8-9cm in A. bisphaerica (Araújo et al, 2003); 11-34cm in A. capiguara (Mariconi, 1974 conditions and/or the prevalence of one of the two different feedback loops proposed in the present study. Digging of a founding nest by ant queens appears to follow a fixed sequence and, like other behavioral sequences that occur once in an animal's life span (Hansell, 1984), this sequence is expected to be rather inflexible and substantially controlled by internal cues.…”

Section: Discussion the Control Of Nest Depth: Underlying Mechanismsmentioning

confidence: 99%

“…Thus, the resulting chamber size did not differ from that of the experiments performed 1day after the nuptial flight (U-test, N10, U4.5, P>0.05; Fig.6B). Fig.7 summarizes the relationship between average tunnel length and average chamber volume for field and laboratory nests of A. vollenweideri, as well as for three independent data sets taken from two published studies on the related species Atta capiguara (Mariconi, 1974;Pereira da Silva et al, 1982). Chamber volume was observed to positively depend on the length of the excavated tunnel, i.e.…”

Section: K Fröhle and F Rocesmentioning

confidence: 99%

The determination of nest depth in founding queens of leaf-cutting ants (Atta vollenweideri): idiothetic and temporal control

Fröhle

Roces

2012

Journal of Experimental Biology

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SUMMARYLeaf-cutting ant queens excavate a founding nest consisting of a vertical tunnel and a final horizontal chamber. Nest foundation is very time consuming, and colony success depends on the excavated depth. Although shallow nests may be energetically cheaper to dig, queens may be more exposed to the changing environment. Deeper chambers, in contrast, may be climatically more stable, but are more expensive to dig. We investigated the mechanisms underlying the control of nest depth in queens of the leaf-cutting ant Atta vollenweideri. We focused on the use of internal information for the control of nest depth, and therefore maintained the soil and environmental conditions invariant during the different laboratory experiments. We compared the tunnel lengths excavated by queens that were able to complete their nests earlier, faster or slower than under standard conditions. An earlier and faster nest completion was obtained by offering queens either pre-excavated tunnels of different lengths, soils at different temperatures, or soft sandy soils. A slower nest excavation was induced by offering queens harder dry soils, and by delaying the start of digging several days after the nuptial flight. Results indicate that the determination of nest depth was a regulated process involving the use of internal references: queens excavated their tunnels either until a particular depth was reached or for some predetermined length of time. Queens appear to monitor their movements while walking up und down the tunnel, and to compare this sensory information with a motor command that represents a preset tunnel length to be excavated before switching to chamber digging. In addition to this form of idiothetic control, results indicate that the elapsed digging time also feeds back onto the control system. It is argued that the determination of nest depth, i.e. the transition from tunnel to chamber digging, is initiated either after a preset tunnel length is reached, or as soon as a maximal time interval has elapsed, irrespective of the excavated tunnel length. A control system using both idiothetic and temporal information, as demonstrated in the present study, allows queens to flexibly react to different soil conditions, and therefore avoid excessive time and energy investments. Possible mechanisms underlying the control of chamber size are also discussed.

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“…It is not known if Atta or other attine foundresses that lack a fungal pellet to establish fungus gardens can produce workers. Autouri (1941), Mariconi (1974) and Weber (1972) reported that some Atta foundresses started nests and laid eggs even though they lacked a fungal pellet; however, these incipient nests did not survive more than one month and did not produce any adults or even larvae. Here we describe results from laboratory foundress colonies of Atta colombica Guérin-Ménéville, showing that foundresses that lacked fungal pellets nevertheless produced small numbers of minima workers.…”

mentioning

confidence: 99%

Production of Minima Workers by Gynes of Atta colombica Guérin-Ménéville (Hymenoptera: Formicidae: Attini) that Lack a Fungal Pellet

Fernández‐Marín¹,

Wcislo²

2005

Journal of the Kansas Entomological Society

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SUMMARY: Early studies of Atta nest founding showed that gynes exhibit claustral nest foundation, cultivate fungal gardens with fecal secretions, and nourish their larvae with eggs. These studies also showed that gynes sometimes lose their fungal pellets, or the fungal garden fails before workers emerge, apparently dooming the incipient colony. Here we report that Atta colombica foundresses maintained in the laboratory can produce workers even though they lack fungal pellets to initiate gardens. If such behavior occurs in nature, it raises the possibility that workers might re-acquire a fungal symbiont after nest establishment, and potentially rescue failing colonies.SPANISH ABSTRACT: Estudios sobre la fundación de nidos por hormigas del género Atta, muestran que hembras conducen una fundación claustral, cultivan los jardines de hongo con sus secreciones fecales y nutren las larvas con huevos tróficos. Estos estudios también muestran que las hembras algunas veces pierden sus sepas de hongos, o los jardines de hongos, antes de la aparición de las obreras, aparentemente condenando las incipientes colonias. Aquí reportamos que fundadoras de Atta colombica mantenidas en laboratorio pueden producir obreras en la ausencia de sus sepas de hongo simbionte para iniciar los jardines y colonias. Si este comportamiento ocurre en la naturaleza, esto sugiere la posibilidad que obreras pueden re-adquirir un hongo simbionte después del establecimiento del nido, y potencialmente rescatar la colonia de la muerte.

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Contribuição para. o conhecimento da "saúva parda" Atta capiguara Gonçalves, 1944

Cited by 12 publications

References 1 publication

Effect of Mature Colony Density on Colonization and Initial Colony Survivorship in Atta capiguara, a Leaf-Cutting Ant

Effect of Mature Colony Density on Colonization and Initial Colony Survivorship in Atta capiguara, a Leaf-Cutting Ant

The determination of nest depth in founding queens of leaf-cutting ants (Atta vollenweideri): idiothetic and temporal control

Production of Minima Workers by Gynes of Atta colombica Guérin-Ménéville (Hymenoptera: Formicidae: Attini) that Lack a Fungal Pellet

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