Alexandre A Oliveira

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Amazonian rainforests are some of the most species-rich tree communities on earth. Here we show that, over the past two decades, forests in a central Amazonian landscape have experienced highly nonrandom changes in dynamics and composition. Our analyses are based on a network of 18 permanent plots unaffected by any detectable disturbance. Within these(More)
The vast extent of the Amazon Basin has historically restricted the study of its tree communities to the local and regional scales. Here, we provide empirical data on the commonness, rarity, and richness of lowland tree species across the entire Amazon Basin and Guiana Shield (Amazonia), collected in 1170 tree plots in all major forest types. Extrapolations(More)
Large-scale patterns of Amazonian biodiversity have until now been obscured by a sparse and scattered inventory record. Here we present the first comprehensive spatial model of tree α-diversity and tree density in Amazonian rainforests, based on the largest-yet compilation of forest inventories and bolstered by a spatial interpolation technique that allows(More)
Jennifer S. Powers 1 *, Rebecca A. Montgomery 2 , E. Carol Adair 3 , Francis Q. Brearley 4 , Saara J. DeWalt 5 , Camila T. Castanho 6 , Jerome Chave 7 , Erika Deinert 8 , Jörg U. Ganzhorn 9 , Matthew E. Gilbert 10 , José Antonio González-Iturbe 11 , Sarayudh Bunyavejchewin 12 , H. Ricardo Grau 13 , Kyle E. Harms 14 , Ankila Hiremath 15 , Silvia(More)
Tree size, density, and species richness were established for three one-hectare plots of terra firme forest in central Amazonian Brazil. In the three hectares, 1916 individual trees with DBH 10 ≥ cm were sampled. A total of 58 families, 181 genera, and 513 species were determined. Hectare A had 285 species, 138 genera, and 47 families; hectare B 280(More)
Ryan A. Chisholm*, Helene C. Muller-Landau, Kassim Abdul Rahman, Daniel P. Bebber, Yue Bin, Stephanie A. Bohlman, Norman A. Bourg, Joshua Brinks, Sarayudh Bunyavejchewin, Nathalie Butt, Honglin Cao, Min Cao, Dairon C ardenas, Li-Wan Chang, Jyh-Min Chiang, George Chuyong, Richard Condit, Handanakere S. Dattaraja, Stuart Davies, Alvaro Duque, Christine(More)
Estimates of extinction risk for Amazonian plant and animal species are rare and not often incorporated into land-use policy and conservation planning. We overlay spatial distribution models with historical and projected deforestation to show that at least 36% and up to 57% of all Amazonian tree species are likely to qualify as globally threatened under(More)
The extent to which pre-Columbian societies altered Amazonian landscapes is hotly debated. We performed a basin-wide analysis of pre-Columbian impacts on Amazonian forests by overlaying known archaeological sites in Amazonia with the distributions and abundances of 85 woody species domesticated by pre-Columbian peoples. Domesticated species are five times(More)
The alpha-diversity of trees found in the region of Manaus, Brazil is among the highest recorded for one-hectare plots in Amazonia or any tropical forest. Based on a survey of the distributions of 2541 Neotropical tree species, we analyzed the geographic distribution of 364 species of terra firme forest trees that occur in the region and that are not(More)
The structure of the Atlantic Forest (AF) has been studied for almost 70 years. However, the related existing knowledge is spread over hundreds of documents, many of them unpublished and/or difficult to access. Synthesis initiatives are available, but they are restricted to only a few parts or types of the AF or are focused on species occurrence. Here, we(More)