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43 results for “Atta”
ATTA Biogeochemistry Data Collection
Datasets collected as part of the collaborative projects studying the impact of leaf cutter ants (Atta cephalotes) on biogeochemical cycling in tropical rainforest soils.
Behavioral performance and division of labor influence brain mosaicism in the leafcutter ant Atta cephalotes
<p>Brain evolution is hypothesized to be driven by behavioral selection on neuroarchitecture. We developed a novel metric of relative neuroanatomical investments involved in performing tasks varying in sensorimotor and processing demands across polymorphic task-specialized workers of the leafcutter ant <i>Atta cephalotes</i> and quantified brain size and structure to examine their correlation with our computational approximations. Investment in multi-sensory and motor integration for task performance was estimated to be greatest for media workers, whose highly diverse repertoire includes leaf-quality discrimination and leaf-harvesting tasks that likely involve demanding sensory and motor processes. Confocal imaging revealed that absolute brain volume increased with worker size and functionally specialized compartmental scaling differed among workers. The mushroom bodies, centers of sensory integration and learning and memory, and the antennal lobes, olfactory input sites, were larger in medias than in minims (gardeners) and significantly larger than in majors ("soldiers"), both of which had lower scores for involvement of olfactory processing in the performance of their characteristic tasks. Minims had a proportionally larger central complex compared to other workers. These results support the hypothesis that variation in task performance influences selection for mosaic brain structure, the independent evolution of proportions of the brain composed by different neuropils.</p>
Fig. 3 in Post-fire effect of savannah vegetation on the establishment of new colonies of Atta sexdens rubropilosa (Hymenoptera: Formicidae)
Fig. 3. Characterization of Atta sexdens rubropilosa surviving colonies in burned and unburned areas, afer 120 d of queen reclusion (female), in soils from 2 depths (0.0–10.0 cm and 10.1–20.0 cm). Means (and standard errors) followed by the same letter did not differ from each other (ANOVA, P> 0.05)
Fig. 2 in Post-fire effect of savannah vegetation on the establishment of new colonies of Atta sexdens rubropilosa (Hymenoptera: Formicidae)
Fig. 2. Characterization of Atta sexdens rubropilosa surviving colonies in burned and unburned areas, afer 120 d of queen reclusion (female). Means (and standard errors) followed by the same letter did not differ from each other (ANOVA, P> 0.05).
Fig. 1 in Post-fire effect of savannah vegetation on the establishment of new colonies of Atta sexdens rubropilosa (Hymenoptera: Formicidae)
Fig. 1. Microbial activity (mean and standard error) in soils collected at 2 depths (0.0 to 10.0 cm and 10.1 to 20.0 cm) in areas with burned and unburned vegetation in Ipameri, GO, Brazil. Means followed by the same letter (accumulated CO2 production at 10 d), for each depth where the soil was collected, did not differ from each other (Mann–Whitney U test, P> 0.05).
Fig. 3 in Dynamics of the restoration of physical trails in the grass-cutting ant Atta capiguara (Hymenoptera, Formicidae)
Fig. 3. Restoration of the physical trails of nest 2. First and last day of survey of trail 1 (A and B, respectively), 2 (C and D, respectively) and 3 (E and F, respectively). The lines B, D, F show the location where the trail was restored.
Fig. 1 in Dynamics of the restoration of physical trails in the grass-cutting ant Atta capiguara (Hymenoptera, Formicidae)
Fig. 1. Percentage variation in the mean length of grass blades for the experimental block (continuous lines) and control block (dashed lines) of each manipulated trail of Nest 1 (A) and 2 (B). The lines of same thickness correspond to the same trail.
Fig. 2 in Dynamics of the restoration of physical trails in the grass-cutting ant Atta capiguara (Hymenoptera, Formicidae)
Fig. 2. Restoration of the physical trails of nest 1. First and last day of survey of trail 1 (A and B, respectively), 2 (C and D, respectively) and 3 (E and F, respectively). The lines on B, D, F show the location where the trail was restored.
Fig. 2 in Seasonal parasitism of the leaf-cutting ant Atta sexdens Linnaeus (Hymenoptera: Formicidae) by phorid flies (Diptera: Phoridae) in a Brazilian Cerrado-Atlantic Forest ecotone
Fig. 2. Correlation between temperature and the number of leaf-cutting ants Atta sexdens parasitized by Apocephalus attophilus (r = −0.722; df = 9; P <0.05).
Fig. 1 in Seasonal parasitism of the leaf-cutting ant Atta sexdens Linnaeus (Hymenoptera: Formicidae) by phorid flies (Diptera: Phoridae) in a Brazilian Cerrado-Atlantic Forest ecotone
Fig. 1. Number of leaf-cutting ants Atta sexdens parasitized by Apocephalus attophilus and Eibesfeldtphora tonhascai in a Brazilian Cerrado-Atlantic Forest ecotone. The seasons are as follows: spring (Sep–Nov), summer (Dec–Feb), fall (Mar–May), and winter (Jun–Aug).
Fig. 1 in Ninhos de Atta sexdens (Hymenoptera: Formicidae) podem afetar a estrutura da assembleia de artrópodes do solo na Mata Atlântica?
Fig. 1. Esquema representativo do experimento de avaliação do impacto dos ninhos de A. sexdens (Linnaeus, 1758) na Reserva Ecológica de Guapiaçu, RJ, Brasil. O círculo representa o ninho da espécie em estudo. Os quadrados (A e B) correspondem às dez amostras de serrapilheira de 0,25 m² a intervalos de 8 m a partir da borda do ninho (0, 8, 16, 24 e 32 m), dispostas ao longo de um transecto linear (seta tracejada).
Behavioral performance and division of labor influence brain mosaicism in the leafcutter ant Atta cephalotes
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Figure 3 in Deciphering the chemical phenotype in Atta laevigata (Smith, 1858) (Hymenoptera: Formicidae): A relationship between polymorphism and cuticular hydrocarbons
Figure 3. Similarity dendrogram based on the similarities and dissimilarities of the cuticular chemical compositions of the subcastes of the ant Atta laevigata based on the data obtained by CG-MS.Cophenetic Correlation Coefficient = 0.76.
Figure 1 in Deciphering the chemical phenotype in Atta laevigata (Smith, 1858) (Hymenoptera: Formicidae): A relationship between polymorphism and cuticular hydrocarbons
Figure 1. Percentage abundance (a) and Number of peaks (b) grouped in the different classes of cuticular hydrocarbons of subcastes of workers of Atta laevigata.
Fig. 1 in Effects of cycloheximide on the mortality of Atta sexdens leaf-cutting worker ants
Fig. 1. Survival curves of Atta sexdens workers during 21 days.
Fig. 4 in Chemical cuticular signature of leafcutter ant Atta sexdens (Hymenoptera, Formicidae) worker subcastes
Fig. 4. Distribution pattern of four cuticular hydrocarbons among Atta sexdens worker subcastes.
Fig. 2. Atta saltensis Forel, 1913 in Inventário da fauna de formigas (Hymenoptera, Formicidae) no Mato Grosso do Sul, Brasil
Fig. 2. Atta saltensis Forel, 1913 no Chaco de Porto Murtinho, MS. Foto: Paulo Robson de Souza.
Phylogenomic reconstruction reveals new insights into the evolution and biogeography of Atta leaf-cutting ants (Hymenoptera: Formicidae)
<p><i>Atta</i> Fabricius is an ecologically dominant leaf-cutting ant genus, the major herbivore of the Neotropics, and an agricultural pest of great economic importance. Phylogenetic relationships within <i>Atta</i> have until now remained uncertain, and the delimitation and identification of a subset of <i>Atta </i>species are problematic. To address these phylogenetic uncertainties, we reconstruct the most comprehensive phylogenetic estimate to date of <i>Atta</i> by employing ultraconserved elements (UCEs). We recovered 2340 UCE loci from 224 <i>Atta </i>specimens, which include 14 out of the 15 identifiable species from across their geographic distributions, and 49 outgroup specimens. Our results strongly support the monophyly of <i>Atta</i> and of the four clades that coincide with the previously recognized subgenera <i>Archeatta</i> Gonçalves, <i>Atta </i>s.s.<i> </i>Emery, <i>Epiatta </i>Borgmeier, and <i>Neoatta </i>Gonçalves. The Archeatta<i> </i>clade contains three species<i> </i>occurring in North and Central America and the Caribbean and is the sister group of the remainder of all other <i>Atta </i>species. The Atta s.s. clade is composed of two species occupying North, Central, and South America. The Epiatta<i> </i>clade<i> </i>contains<i> </i>seven entirely South American species and the two species of the Neoatta clade<i> </i>occur in Central and South America. Divergence-dating analyses identify a series of major events in the Miocene, such as the divergence of <i>Acromyrmex</i> Mayr and <i>Atta</i> 16.7 million years ago (Ma) and the crown-group origin of <i>Atta</i> around 8.5 Ma. Extant <i>Atta</i> species evolved very recently, originating in the early Pleistocene, approximately 1.8 to 0.3 Ma (crown-group ages). We provide the first evidence that <i>Atta goiana </i>Gonçalves belongs to the Epiatta clade and that<i> Atta robusta</i> Borgmeier is the species with the youngest crown-group age of 0.3 Ma. The very young ages of <i>Atta </i>and its component species indicate a recent, rapid radiation. Biogeographic analyses suggest that the range of the most recent common ancestor of <i>Atta</i> consisted of the combined North/Central America and NW South America bioregions and that one daughter lineage subsequently dispersed into South America, rapidly diversifying in the newly formed Cerrado biome and Chaco, and further dispersing into the Atlantic Forest, Caatinga, and Pampas bioregions.</p>
Waste of Atta leaf-cutting ants provides nutriment for Leptodactylus rhodonotus tadpoles (Hymenoptera, Formicidae; Amphibia, Leptodactylidae)
<p>Video sequence obtained on 20 November 2019 in rainforest at 915 m a.s.l., Departamento Pasco, Peru, showing the edge of the ants' waste heap at a small roadside ditch, with leaf-cutting ants dropping waste crumbs into the running water and <em>Leptodactylus rhodonotus</em> tadpole feeding on ant waste.</p> <p>Reference to this video has been published in the following article:</p> <p><span>Köhler, J. & F. Glaw (2023): </span><span>Waste of <em>Atta</em> leaf-cutting ants provides nutriment for <em>Leptodactylus rhodonotus</em> tadpoles (Hymenoptera, Formicidae; Amphibia, Leptodactylidae). Spixiana 46 (1): 20.</span></p> <p> </p>
Phylogenomic reconstruction reveals new insights into the evolution and biogeography of Atta leaf-cutting ants (Hymenoptera: Formicidae)
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