Produtividade primária líquida e sazonalidade da temperatura e precipitação são indicadoras da riqueza de espécies das libélulas na Amazônia
Várias hipóteses foram propostas para explicar os mecanismos que geram padrões de riqueza de espécies temporais e espaciais. Quatro hipóteses comuns foram testadas (água, energia, heterogeneidade climática e produtividade primária líquida) para avaliar quais...
Simulando o efeito do El Niño na Floresta Amazônica: o experimento "Seca Floresta"
Documento de Divulgação do Projeto “Seca-Floresta”, que propõe avaliar, por meio de uma abordagem experimental, a resposta da vegetação florestal a uma seca produzida artificialmente. Os principais resultados conseguidos até o momento estão relatados neste documento.
Sensitive development could protect Amazonia instead of destroying it
After 40 years of government induced settlement of the Brazilian Amazon, the core of this region has experienced surprisingly little deforestation. The agriculture and ranching that cause deforestation depend upon reliable roads, which are concentrated along the...
Hypogaeic and epigaeic ant (Hymenoptera : Formicidae) assemblages of atlantic costal rainforest and dry mature and secondary Amazon forest in Brazil : Continuums or communities
Meat, flour and sugar baits were used on the soil surface and buried to examine species composition of the ant fauna in three separate tropical forests in Brazil, and to control for the effect of the regional faunal pool. Compositional mosaic diversities were...
Smallholder agriculture along the lower Amazon floodplain, Brazil
This paper describes smallholder agricultural systems in the lower Amazon where the Santarém sub-Cluster is based. Here, despite the fertility of floodplain soils and a long tradition of floodplain farming, smallholder agriculture is stagnating. Once the basis of...
Vertical patterns of soil water uptake by plants in a primary forest and an abandoned pasture in the eastern Amazon: an isotopic approach
This study evaluated the water uptake patterns of a primary forest and of the savanna-like vegetation of an abandoned pasture in an eastern Amazon site. We used natural stable isotope abundance in the soil profile, as well as plots irrigated with deuterated water...
Shell size variation and aggregation behavior of Littoraria flava (Gastropoda : Littorinidae) on a southeastern Brazilian shore
Littoraria flava is a common snail on rocky shores and stems of mangrove trees along the southeastern coast of Brazil. However, studies on this species are absent. Our previous observation indicated a distance distribution pattern among shell size classes of this...