Learn More
Understanding the mechanisms that promote the invasion of natural protected areas by exotic plants is a central concern for ecology. We demonstrated that nests of the leaf-cutting ant, Acromyrmex lobicornis, near roadsides promote the abundance, growth and reproduction of two exotic plant species, Carduus nutans and Onopordum acanthium, in a national park(More)
Wildfires are one of the major disturbances in the dynamics of forests and shrublands. However, little is known about their effects on insect communities that contribute to faunal biodiversity and play key roles in the ecosystem's dynamics. An intense and widespread fire occurred in 1999 in the Nahuel Huapi National Park in the Andean forest in northern(More)
Studies of herbivory and its consequences on the growth of native and exotic plants could help elucidate some processes involved in plant invasions. Introduced species are likely to experience reduced herbivory in their new range due to the absence of specialist enemies and, thus, may have higher benefits if they reduce the investment in resistance and(More)
Compensation, the degree of plant recovery after herbivory, is influenced by nutrient availability. The compensatory continuum hypothesis (CCH) predicts that the more abundant the resources in an environment, the greater the potential for compensation. Nutrient-rich patches generated by leaf-cutting ants near their nests could modify plants’ responses to(More)
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(More)
Understanding the responses of natural communities to disturbances remains a challenging task in ecology. In northwestern Patagonia, the most important disturbances are fire and introduced ungulates. Although these disturbances have been present in this region since late eighteen century, their effects on arthropods diversity have been poorly studied. Here,(More)
We used a simple engineering principle, which suggests that the width of a road needed for a smooth traffic flow is proportional to the peak traffic volume (“engineering hypothesis”), to analyze the adaptive significance of trail width at branching points in the leaf-cutting ant Atta cephalotes. Since the flow of outgoing ants splits at trail bifurcations(More)
La semilla de Campsiandra angustifolia (Fabaceae: Caesalpiniodeae) como un reflejo de las presiones selectivas sobre su dispersión y establecimiento Abstract: The seeds of Campsiandra angustifolia (Fabaceae: Caesalpiniodeae) as a reflex of selective pressures on dispersal and establishment. We indirectly evaluated the selective pressures on dispersal and(More)
A better understanding of plant–herbivore relationships should integrate negative and positive effects of consumers on plant fitness. We studied the effect of a major insect herbivore (leaf-cutting ants, LCA) on plant fitness in several species of Monte Desert, assessing both the direct negative effect of ant defoliation and the indirect positive role of(More)
Ant-aphid relationships provide excellent opportunities to study how changes in resource availability may affect the outcome of competitive interactions. Variations in soil fertility may affect host plant quality, with concomitant effects on aphid abundance and the amount/quality of aphid honeydew. This may determine the intensity at which tending ants(More)
  • 1