5 documents found, page 1 of 1
The costs of evaluating species densities and composition of snakes to assess d...
Fraga, Rafael de; Stow, Adam J.; Magnusson, William Ernest; Lima, Albertina PimentalStudies leading to decision-making for environmental licensing often fail to provide accurate estimates of diversity. Measures of snake diversity are regularly obtained to assess development impacts in the rainforests of the Amazon Basin, but this taxonomic group may be subject to poor detection probabilities. Recently, the Brazilian government tried to standardize sampling designs by the implementation of a sy...
Different environmental gradients affect different measures of snake β-diversit...
Fraga, Rafael de; Ferrão, Miquéias; Stow, Adam J.; Magnusson, William Ernest; Lima, Albertina PimentalMechanisms generating and maintaining biodiversity at regional scales may be evaluated by quantifying β-diversity along environmental gradients. Differences in assemblages result in biotic complementarities and redundancies among sites, which may be quantified through multi-dimensional approaches incorporating taxonomic β-diversity (TBD), functional β-diversity (FBD) and phylogenetic β-diversity (PBD). Here we ...
Soil and forest structure predicts large-scale patterns of occurrence and local...
Ferreira, Anthony S.; Jehle, Robert; Stow, Adam J.; Lima, Albertina PimentalThe distribution of biodiversity within the Amazon basin is often structured by sharp environmental boundaries, such as large rivers. The Amazon region is also characterized by subtle environmental clines, but how they might affect the distributions and abundance of organisms has so far received less attention. Here, we test whether soil and forest characteristics are associated with the occurrence and relative...
Contrasting Patterns of Gene Flow for Amazonian Snakes That Actively Forage and...
Fraga, Rafael de; Lima, Albertina Pimental; Magnusson, William Ernest; Ferrão, Miquéias; Stow, Adam J.Knowledge of genetic structure, geographic distance and environmental heterogeneity can be used to identify environmental features and natural history traits that influence dispersal and gene flow. Foraging mode is a trait that might predict dispersal capacity in snakes, because actively foragers typically have greater movement rates than ambush predators. Here, we test the hypothesis that 2 actively foraging s...
The value of including intraspecific measures of biodiversity in environmental ...
Simões, Pedro Ivo; Stow, Adam J.; Hödl, Walter; Amézquita, Adolfo; Farias, Izeni P.; Lima, Albertina PimentalThe distribution of many vertebrate species in the Amazon basin is delimited by large rivers, which are frequently regarded as geographic barriers related with speciation and are therefore of high conservation value. Rapid development in the region includes plans to dam one of its thirteen major rivers, the Xingu. Environmental impact assessment is required for large scale development within the Brazilian porti...