14 research outputs found
Fatores que determinam a ocorrência de formigas, em particular poneromorfas, no dossel de florestas tropicais
No full textWood-boring beetles promote ant nest cavities: extended effects of a twig-girdler ecosystem engineer
No full textAnt Fauna on Cecropia pachystachya Trécul (Urticaceae) Trees in an Atlantic Forest Area, Southeastern Brazil
No full textCecropia are pioneer successional trees frequently associated with ants. Generally a single dominant colony of Azteca ant inhabits each mature Cecropia tree, but other ant species may be found living or foraging on the same tree. In this study, we assessed the diversity of ant species on Cecropia pachystachya trees in two sites in the Brazilian Atlantic Forest: a dust-free roadside and a dusty roadside. We also investigated the influence of tree architecture on ant species richness. We found a total of 24 ant species distributed in 11 genera and five subfamilies on C. pachystachya trees; 18 in the dust-free roadside and 14 in the dusty roadside. We found up to five ant species on a single tree, but only Azteca alfari was frequently encountered. Ant species richness per tree did not differ significantly between sites and was related to tree architectural traits. On the other hand, ant species composition on trees differed significantly between sites. Our study indicates that heavy dust deposition on Cecropia trees may affect associated ant communities, not by changing ant species richness, but by causing different species to live and forage on trees under different dust exposure
Ant Fauna on Cecropia pachystachya Trécul (Urticaceae) Trees in an Atlantic Forest Area, Southeastern Brazil
No full textCecropia are pioneer successional trees frequently associated with ants. Generally a single dominant colony of Azteca ant inhabits each mature Cecropia tree, but other ant species may be found living or foraging on the same tree. In this study, we assessed the diversity of ant species on Cecropia pachystachya trees in two sites in the Brazilian Atlantic Forest: a dust-free roadside and a dusty roadside. We also investigated the influence of tree architecture on ant species richness. We found a total of 24 ant species distributed in 11 genera and five subfamilies on C. pachystachya trees; 18 in the dust-free roadside and 14 in the dusty roadside. We found up to five ant species on a single tree, but only Azteca alfari was frequently encountered. Ant species richness per tree did not differ significantly between sites and was related to tree architectural traits. On the other hand, ant species composition on trees differed significantly between sites. Our study indicates that heavy dust deposition on Cecropia trees may affect associated ant communities, not by changing ant species richness, but by causing different species to live and forage on trees under different dust exposure
Explaining export regional involvement through marketing strategy : the case of Spanish companies exporting to Latin America
No full textThe equivalence between the absence of arbitrage and the existence of an equivalent martingale measure fails when an infinite number of trading dates is considered. By enlarging the set of states of nature and the probability measure through a projective system of topological spaces and Radon measures, we characterize the absence of arbitrage when the time set is countable
Ants of Brazil: an overview based on 50 years of diversity studies
No full textDespite the historical efforts to list and organize the taxonomic knowledge about the Brazilian ant fauna, the most diverse in the world, several gaps regarding species distribution data and sampling coverage persist. In an attempt to fill some of these gaps, we here apply a scientometric approach to provide an updated overview of the ants of Brazil based on formal publications on ant diversity in the Brazilian territory. In the last 50 years, ant diversity studies in Brazil revealed 1130 species, corresponding to around 70% of the species known to occur in the country. The Brazilian biomes with the highest number of described species recorded were, respectively, the Amazon Forest (716 species), Atlantic Forest (657 species), Cerrado (389 species), Caatinga (185 species), Pantanal (143 species), and Pampa (86 species). Considering the number and frequency of unidentified species, the genera Azteca, Hypoponera, Pheidole, and Solenopsis represent the main knowledge frontiers regarding taxonomic resolution, with more than 80% of their records associated with morphospecies codes in diversity studies in Brazil. Moreover, around 7.5% of the papers presented inconsistences in their species lists regarding the validity of taxonomic names, and we found studies for which some taxa records are geographically implausible. Besides demonstrating the importance of ecological publications to the ant diversity knowledge in Brazil, our findings highlight a strong sampling bias in ant occurrence data in the country, with species records unevenly distributed across Brazilian biomes. In short, our results constitute valuable information for future projects on ant taxonomy and surveying in Brazilian natural areas
Ants of Brazil: an overview based on 50 years of diversity studies
No full textDespite the historical efforts to list and organize the taxonomic knowledge about the Brazilian ant fauna, the most diverse in the world, several gaps regarding species distribution data and sampling coverage persist. In an attempt to fill some of these gaps, we here apply a scientometric approach to provide an updated overview of the ants of Brazil based on formal publications on ant diversity in the Brazilian territory. In the last 50 years, ant diversity studies in Brazil revealed 1130 species, corresponding to around 70% of the species known to occur in the country. The Brazilian biomes with the highest number of described species recorded were, respectively, the Amazon Forest (716 species), Atlantic Forest (657 species), Cerrado (389 species), Caatinga (185 species), Pantanal (143 species), and Pampa (86 species). Considering the number and frequency of unidentified species, the genera Azteca, Hypoponera, Pheidole, and Solenopsis represent the main knowledge frontiers regarding taxonomic resolution, with more than 80% of their records associated with morphospecies codes in diversity studies in Brazil. Moreover, around 7.5% of the papers presented inconsistences in their species lists regarding the validity of taxonomic names, and we found studies for which some taxa records are geographically implausible. Besides demonstrating the importance of ecological publications to the ant diversity knowledge in Brazil, our findings highlight a strong sampling bias in ant occurrence data in the country, with species records unevenly distributed across Brazilian biomes. In short, our results constitute valuable information for future projects on ant taxonomy and surveying in Brazilian natural areas.</p
Data from Queiroz et al Ant diversity decreases during the dry season: a meta-analysis of the effects of seasonality on ant richness and abundance.xlsx
No full textData from Queiroz et al
Reduction in ant diversity during the dry season: a meta-analysis of the effects of seasonality on ant richness and abundance
Abstract
Tropical studies present seasonal variation of insect richness, density, and changes in species composition. However, responses of assemblages to climate change associated with seasons may not follow the same patterns across ecosystems due to biotic and abiotic factors (e.g., resources and conditions). These idiosyncratic responses might be particularly true in Brazilian territory, a country with various environments and vegetation types across a vast geographical range that harbors one of the most diverse ant faunas in the world. This study addressed the relationship between ant diversity and seasonal variation using published data collected in Brazilian territory. Specifically, we tested the effect of the main seasons on ant abundance and richness. Seasonal patterns of diversity are poorly explored for ants in Brazil (53 from 416 studies published between 2000 and 2018). These studies were developed mainly in the Atlantic Forest biome, collected ants with Pitfall traps as a sampling method, and covered the soil/litter stratum. Considering all papers, doing a simple “vote-counting” (by comparisons of the number of significant results), authors find similar ant abundance, richness, and species composition between seasons, as often proposed in literature. However, when we performed a meta-analysis, we observed a clear pattern of seasonal variation, with higher ant abundance and richness in the wet/summer season. Our systematic review, however, reveals the seasonality effect in reducing ant diversity on the dry season, especially in the Cerrado. Additionally, we point out that differences between biomes also indicate the need to explore seasonal effects among vegetation types in each biome.</p
