Amphibians Anurans
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Efeitos da fragmentação da floresta na diversidade e abundância de anfíbios anuros e lagartos de serapilheira em uma paisagem do Planalto Atlântico de São Paulo. / Forest fragmentation effects on diversity and abundance of leaf-litter anurans and lizards in a landscape of Atlantic Plateau of São Paulo.
Para analisar os efeitos da perda de habitat e fragmentação da Mata Atlântica sobre as espécies de anfíbios anuros e lagartos de serapilheira amostramos 15 fragmentos florestais e seis localidades de mata contínua na região de Tapiraí e Piedade, Planalto Atlântico de São Paulo. Apesar de abrigar alta riqueza de espécies em comparação com outros
Publicado em: 2009
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14. Physiological and ecololgical aspects of aestivation in Pleurodema diplolistris (Leiuperidae/Anura) / Aspectos fisiológicos e ecológicos da estivação em Pleurodema diplolistris (Leiuperidae/Anura)
Caatinga is a Brazilian semi-arid bioma that is characterized by the dryness and the unpredictable seasonality of rains. In some anurans the survive is associate with aestivation, a set of strategies for survival in arid conditions. Pleurodema diplolistris frogs (Leiuperidae/Anura) are found buried in the Caatinga during the dry time. Evidences indicate that
Publicado em: 2009
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15. Biodiversidade e padrões de distribuição da anurofauna do Parque nacional das emas e entorno / Biodiversity and distribution patterns of frogs of the Emas National Park and surrounding
Composition and diversity of anuran amphibians in preserved and disturbed environments in the Cerrado of the State of Goiás, Mid-West Brazil. The Cerrado is the second largest biome of Brazil, with an approximate area of 2 million km, which represents about 23% of the total area of the country. Despite the high conversion of natural areas of the Cerrado in
Publicado em: 2009
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16. Diversidade e conservação de anfíbios anuros no estado de Santa Catarina, sul do Brasil / Diversity and Conservation of amphibians in Santa Catarina State, southeastern Brazil
Despite the high diversity of anurans in the Atlantic Forest, little is known about geographic variations in the richness and composition of assemblages. This study summarizes the current knowledge on the richness and geographic distribution of anurans in Santa Catarina State, southern Brazil, and identifies areas for conservation and the main knowledge gaps
Publicado em: 2008
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17. Ecoregion priorization for terrestrial vertebrate conservation / Priorização de ocorregiões para a conservação de vertebrados terrestres
I aimed to identify conservation priorities for terrestrial vertebrates across different spatial scales (from regional/continental to global), using ecoregions as geographic units. I have evaluated, in particular, (1) the congruence between overall richness and endemism patterns among terrestrial vertebrates that occur in Brazil, and the effectiveness of eac
Publicado em: 2008
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18. Cerrado assemblages of reptiles and amphibians along the drainage of Rio Tocantins and the impact of hydroelectric power plants on their conservation / Assembléias de répteis e anfíbios do Cerrado ao longo da bacia do rio Tocantins e o impacto do aproveitamento hidrelétrico da região na sua conservação
The Cerrado herpetofauna was studied along the basin of the Tocantins river using three distinct and complementary approaches. First, a fast sampling scheme, covering all the studied area, was conducted in 11 sites between the Central Plateau, in the state of Goiás, and the northern portion of the Tocantins depression, at the border of the states of Tocanti
Publicado em: 2007
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19. Divergência acústica e morfológica em populações de Allobates femoralis (Anura, Dendrobatidae) do alto Rio Madeira.
Since the 19th century, researchers have hypothesized that large Amazonian rivers function as barriers to dispersal. However, case studies using anurans detected no river effect to date in the region. This study aimed to determine the influence of the upper Madeira River on acoustic and morphological divergence patterns in populations of the dart-poison frog
Publicado em: 2006
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20. Eficiência de armadilhas de queda (pitfall traps) em amostragens de anfíbios e répteis no Brasil
The effectiveness of pitfall traps associated with drift fences to capture amphibians and reptiles in three field studies, in Rio Grande do Sul (extreme southern Brazil), São Paulo (São Paulo, southeastern Brazil), and Amazonas (Amazonas, northern Brazil) is described. At Santa Maria, a total of 2040 amphibians and reptiles were caught in 30 pitfalls (200
Revista Brasileira de Zoologia. Publicado em: 2000-09
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21. Utilização de recursos para reprodução em comunidade de anuros no sudeste do Brasil
Na anuran community was studied at Morro do Ferro, municipalyty of Poços de Caldas (21º48?S, 46º35?W), Minas Gerais State. This consisted of a single altitudinal region (1400 m above sea level) on a plateau composed mainly of alkaline rocks of cretaceous age, with high natural radioctivity. The study carried out between september, 1980 and june, 1983, wit
Publicado em: 1986
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22. Hydrins, hydroosmotic neurohypophysial peptides: osmoregulatory adaptation in amphibians through vasotocin precursor processing.
From neurointermediate pituitary glands of Xenopus laevis and Rana esculenta, previously unreported peptides termed hydrins, active on water permeability of frog urinary bladder and frog skin (Brunn or "water-balance" effect), have been isolated and sequenced. These peptides seem to be derived from the pro-vasotocin-neurophysin precursor. Hydrin 1, found in
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23. Multiple, recurring origins of aposematism and diet specialization in poison frogs
Aposematism is the association, in a prey organism, of the presence of a warning signal with unprofitability to predators. The origin of aposematism is puzzling, because of its predicted low probability of establishment in a population due to the prey's increased conspicuousness. Aposematism is a widespread trait in invertebrate taxa, but, in vertebrates, it
National Academy of Sciences.
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24. Position dependent expression of a homeobox gene transcript in relation to amphibian limb regeneration.
Adult urodele amphibians such as the newt Notophthalmus viridescens are capable of regenerating their limbs and tail by formation of a blastema, a growth zone of mesenchymal progenitor cells. In an attempt to identify genes implicated in specification of the regenerate, we screened a newt forelimb blastema cDNA library with homeobox probes, and isolated and