Encontrados 122 documentos, a visualizar página 1 de 13

The costs of evaluating species densities and composition of snakes to assess d...

Studies 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...

Science or politics: the case of Caiman yacare.

The words "population" and "community" have outlived their usefulness in ecolog...

The concepts of "population" and "community" are so fundamental to the identity of ecological science that their use is almost never questioned, even though many authors have noted that neither has a generally accepted definition. Authors continue to invent new definitions without noting that their definitions will exclude most other ecologists. While there have been many publications questioning the utility of...

Dismantling Brazil's science threatens global biodiversity heritage

In the middle of a political and fiscal crisis, the Brazilian government is applying successive budget cuts, including in science funding. Recent cuts radically affect research programs on biodiversity that are crucial components for the design and monitoring of public policies for nature conservation and sustainable development. We analyze the consequences of such cuts on the Research Program on Biodiversity (...

Dead Paleosuchus on roads in Brazil

The effect of dam construction on the movement of dwarf caimans, Paleosuchus tr...

Run-of-the-river hydroelectric dams cause changes in seasonal inundation of the floodplains, and this may cause displacement of semi-aquatic vertebrates present before dam construction. This study evaluated the movement of crocodilians before and after the filling of the Santo Antônio hydroelectric reservoir on the Madeira River in the Brazilian Amazon, which occurred in November 2011. We radio-tracked four adu...

Brazilian Crocodilians: The Problems of Conservation In A Multispecies System.

Distance to large rivers affects fish diversity patterns in highly dynamic stre...

Longitudinal-zonation hypotheses generally predict gradual changes in fish composition from upstream to downstream due to changes in habitat conditions, but largely disregard downstream effects on upstream segments. Floodplains of large rivers represent areas of high connectivity during flood periods and can act as stable refuges in dry seasons, which may attenuate deterministic constraints imposed by local con...

Tropical tadpole vulnerability to predation: association between laboratory res...

The need for large-scale, integrated studies of biodiversity - the experience o...

Brazilian Amazonia covers around 5 million km2. If we could sample it regularly, with one sample for each 1 degree cell (10,000 km2), we would need 500 sample sites. It is clear that financial costs limit the amplitude of biodiversity studies. As the area to be explored is so large, financial resources limited, and demands varied, a program on Amazonian biodiversity research must be cost-effective. Integrated a...