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68 results for “leaf-cutting ants”
Figure 1 in Biological attributes of Argentinian phorid parasitoids (Insecta: Diptera: Phoridae) of leaf-cutting ants, Acromyrmex and Atta
Figure 1. Ant size (head width in mm) distributions from foragers or waste removers from all nests pooled (in dark grey) discriminating those selected by different species of phorids (in white); light grey represents the intersection of both distributions). Left column, parasitoids of Acromyrmex: Myrmosicarius catharinensis selecting Acromyrmex heyeri foragers, Myrmosicarius cristobalensis selecting Acromyrmex lobicornis foragers, and Myrmosicarius crudelis selecting Acromyrmex crassispinus waste removers; right column, parasitoids of Atta vollenweideri: Myrmosicarius brandaoi, Myrmosicarius gonzalezae and Eibesfeldtphora trilobata. Asterisk denotes median values and black arrows indicate range of
Figure 5 in Biological attributes of Argentinian phorid parasitoids (Insecta: Diptera: Phoridae) of leaf-cutting ants, Acromyrmex and Atta
Figure 5. Natural parasitism rate by phorid species reared from Atta vollenweideri foragers, discriminated by seasons. The contribution of the two Myrmosicarius species was estimated together, as males were not possible to be identified. Numbers represent nest codes to follow parasitism through time.
Figure 3 in Biological attributes of Argentinian phorid parasitoids (Insecta: Diptera: Phoridae) of leaf-cutting ants, Acromyrmex and Atta
Figure 3. Seasonal parasitism rates by phorid parasitoids from of Atta and Acromyrmex ants. Boxes represent median and quartiles; circles are outliers.
Figure 2 in Biological attributes of Argentinian phorid parasitoids (Insecta: Diptera: Phoridae) of leaf-cutting ants, Acromyrmex and Atta
Figure 2. Adjusted least square regression lines for ant head sizes selected by phorids and the thorax width of the adult parasitoids that emerged from them. Above, parasitoids of Acromyrmex; below, Atta's phorids; note different scales in both axes.
Data from: Interaction specificity between leaf-cutting ants and vertically transmitted Pseudonocardia bacteria
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Data from: Extended phenotypes and foraging restrictions: ant nest entrances and resource ingress in leaf-cutting ants
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With a little help from my friends: individual and collaborative performance during trail clearing in leaf-cutting ants
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Data from: Rain shadow effects predict population differences in thermal tolerance of leaf-cutting ant workers (Atta cephalotes)
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Data from: Differential gene expression in Acromyrmex leaf-cutting ants after challenges with two fungal pathogens
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Data from: Random sperm use and genetic effects on worker caste fate in Atta colombica leaf-cutting ants
Sperm competition can produce fascinating adaptations with far-reaching evolutionary consequences. Social taxa make particularly interesting models, because the outcome of sexual selection determines the genetic composition of groups, with attendant sociobiological consequences. Here, we use molecular tools to uncover some of the mechanisms and consequences of sperm competition in the leaf-cutting ant Atta colombica, a species with extreme worker size polymorphism. Competitive PCR allowed quantification of the relative numbers of sperm stored by queens from different males, and offspring genotyping revealed how sperm number translated into paternity of eggs and adult workers. We demonstrate that fertilisation success is directly related to sperm numbers, that stored sperm are well mixed and that egg paternity is constant over time. Moreover, worker size was found to have a considerable genetic component, despite expectations that genetic effects on caste fate should be reduced in species with a low degree of polyandry. Our data suggest that sexual conflict over paternity is largely resolved by the lifetime commitment between mates generated by long-term sperm storage, and show that genetic variation for caste can persist in societies with comparatively high relatedness.
Data from: Human disturbance promotes herbivory by leaf-cutting ants in the Caatinga dry forest
Anthropogenic disturbances are known to modify plant-animal interactions such as those involving the leaf-cutting ants, the most voracious and proliferating herbivore across human-modified landscapes in the Neotropics. Here we evaluate the effect of chronic anthropogenic disturbance (e.g. firewood collection, livestock grazing) and vegetation seasonality on foraging area, foliage availability in the foraging area, leaf consumption, and herbivory rate of the leaf-cutting ant Atta opaciceps in the semi-arid Caatinga, a mosaic of dry forest and scrub vegetation in northeast Brazil. Contrary to our initial expectation, the foraging area was not affected by either disturbance intensity or the interaction between season and disturbance intensity. However, leaf consumption and herbivory rate were higher in more disturbed areas. We also found a strong effect of seasonality, with higher leaf consumption and herbivory rate in the dry season. Our results suggest that the foraging ecology of leaf-cutting ants is modulated by human disturbance and seasonality as these two drivers affect the spectrum and the amount of resources available for these ants in the Caatinga. Despite the low productivity of Caatinga vegetation, the annual rates of biomass consumption by A. opaciceps are similar to those reported from other leaf-cutting ants in rainforests and savannas. This is made possible by maintaining high foraging activity even in the peak of the dry season and taking benefit from any resource available, including low-quality items. Such compensation highlights the adaptive capacity of LCA to persist or even proliferate in human-modified landscapes from dry to rainforests.
Data from: Dynamic Wolbachia prevalence in Acromyrmex leaf-cutting ants: potential for a nutritional symbiosis
Wolbachia are renowned as reproductive parasites, but their phenotypic effects in eusocial insects are not well understood. We used a combination of qrt-PCR, fluorescence in situ hybridisation, and laser scanning confocal microscopy to evaluate the dynamics of Wolbachia infections in the leaf-cutting ant Acromyrmex octospinosus across developmental stages of sterile workers. We confirm that workers are infected with one or two widespread wsp genotypes of Wolbachia, show that colony prevalences are always 100%, and characterize two rare recombinant genotypes. One dominant genotype is always present and most abundant while another only proliferates in adult workers of some colonies and is barely detectable in larvae and pupae. An explanation may be that Wolbachia genotypes compete for host resources in immature stages while adult tissues provide substantially more niche space. Tissue-specific prevalences of the two genotypes differ, with the rarer genotype being overrepresented in the adult foregut and thorax muscles. Both genotypes occur extra-cellularly in the foregut, suggesting an unknown mutualistic function in worker ant nutrition. Both genotypes are also abundant in the faecal fluid of the ants, suggesting that they may have extended functional phenotypes in the fungus garden that the ants manure with their own faeces.
Data from: Collective response of leaf-cutting ants to the effects of wind on foraging activity
One advantage of sociality is to mitigate environmental restrictions through collective behavior. Here we document a colony-level response of leaf-cutting ants to wind, an environmental factor that impedes foraging. Given that larger ants adhere more strongly to the substrate, increasing forager size in windy conditions should reduce the negative effect of wind. We tested this idea for Acromyrmex lobicornis in windy regions of Patagonia. We examined (1) whether the fraction of larger ants versus smaller ants increased in windy conditions and (2) whether the effect of wind on the ants' movement was lower for larger ants. The size-frequency distribution of foragers was skewed more toward larger ants in nature under more windy conditions. Under windy conditions in the field, the mobility of smaller ants was more reduced than that of larger ants. The change toward larger foragers in windy conditions reduced the negative effect of wind by 32%, illustrating how a social organism can collectively mitigate the adverse effects of the environment.
Fig. 1 in The First Records of Bycrea villosa Pascoe (Coleoptera: Tenebrionidae) in the United States, Central America and Colombia and Notes on Its Association with Leaf-Cutting Ants
Fig. 1. Bycrea villosa, male, dorsal view. Body length, 6 mm. Specimen from Pima County, Arizona.
Census data of growth, mortality and size stage transitions of nests of leaf-cutting ant species before and after fires
<p>We hypothesized that fires will affect more the species that build external, easily flammable thatch mounds with superficial fungal gardens (<i>Acromyrmex lobicornis</i>) than colonies that build subterranean nests in the less-flammable bare-ground (<i>Acromyrmex striatus</i>). We use a stochastic matrix demographic model parameterized with 4 years of data in pre and post fire scenarios. This data set contain all the census data which from we build the matrix models.</p>
Figure 2 in Polygyny, oviposition, life cycle and longevity of the three subspecies of leaf-cutting ants, Acromyrmex subterraneus (Hymenoptera: Formicidae)
Figure 2. Survival curves of three subspecies of the Acromyrmex subterraneus complex.
Census data of growth, mortality and size stage transitions of nests of leaf-cutting ant species before and after fires
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Data from: Dynamic Wolbachia prevalence in Acromyrmex leaf-cutting ants: potential for a nutritional symbiosis
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Data from: Innate turning preference of leaf-cutting ants in the absence of external orientation cues
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Data from: Shear adhesive performance of leaf-cutting ant workers (Atta cephalotes)
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Allen Brain Atlas
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