15 documents found, page 1 of 2
The Amazon Tall Tower Observatory (ATTO): Overview of pilot measurements on eco...
Andreae, Meinrat O.; Acevedo, Otávio C.; Araüjo, Alessandro Carioca de; Artaxo, Paulo; Barbosa, Cybelli G.G.; Barbosa, H. M. J.; Brito, Joel F.The Amazon Basin plays key roles in the carbon and water cycles, climate change, atmospheric chemistry, and biodiversity. It has already been changed significantly by human activities, and more pervasive change is expected to occur in the coming decades. It is therefore essential to establish long-term measurement sites that provide a baseline record of present-day climatic, biogeochemical, and atmospheric cond...
Biased-corrected richness estimates for the Amazonian tree flora
ter Steege, H.; Prado, Paulo I.; Lima, Renato A.Fde; Pos, Edwin T.; Coelho, Luiz Souza de; Lima Filho, Diógenes de Andrade; Salomão, Rafael PaivaAmazonian forests are extraordinarily diverse, but the estimated species richness is very much debated. Here, we apply an ensemble of parametric estimators and a novel technique that includes conspecific spatial aggregation to an extended database of forest plots with up-to-date taxonomy. We show that the species abundance distribution of Amazonia is best approximated by a logseries with aggregated individuals,...
Distribution and Growth of Garcinia brasiliensis Mart. and Hevea spruceana (Ben...
Silva Marinho, Tatiana Andreza da; Lopes, Aline; Assis, Rafael Leandro de; Ramos, Santiago Linorio Ferreyra; Gomes, Liene Rocha PicançoThis study assessed the distribution and growth of two tree species in a seasonal mixed-water inundation forest near the city of Manaus, and determined the annual growth rates and ages of trees. The aboveground wood biomass was estimated for each population. Eight plots of 25 × 25 m were established, where all individuals of the species Garcinia brasiliensis and Hevea spruceana with heights ≥ 1.0 m were invento...
Biometrics and germination of Macrolobium acaciifolium (Benth.) Benth. seeds fr...
Santos, Lucélia Rodrigues; Almeida, Marilene de Campos; Wittmann, Florian KarlThis study focuses on the morphometric analysis of seeds of Macrolobium acaciifolium from environments of Amazonian floodplains and igapó, as well as the effect of the substrates of these areas on the germination and seedling formation of the species. A biometric analysis of 200 M. acaciifolium seeds from populations of both Central Amazon environments was performed. In greenhouse, germination of seeds under th...
Author Correction: Climatic controls of decomposition drive the global biogeogr...
Steidinger, Brian S.; Crowther, Thomas Ward; Liang, Jingjing; van Nuland, Michael E.; Werner, Gijsbert; Reich, Peter B.; Nabuurs, Gert JanIn this Letter, the middle initial of author G. J. Nabuurs was omitted, and he should have been associated with an additional affiliation: ‘Forest Ecology and Forest Management Group, Wageningen University and Research, Wageningen, The Netherlands’ (now added as affiliation 182). In addition, the following two statements have been added to the Supplementary Acknowledgements. (1): ‘We would particularly like to ...
Estimating the global conservation status of more than 15,000 Amazonian tree sp...
Steege, Hans Ter; Pitman, Nigel C.A.; Killeen, Timothy J.; Laurance, William F.; Peres, Carlos A.; Guevara, Juan Ernesto; Salomão, Rafael PaivaEstimates 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 International Union for Conservation of Nature (IUCN) Red ...
Composition, structure and floristic diversity in dense rain forest in the east...
Carim, Marcelo de Jesus Veiga; Guimarães, José Renan da Silva; Tostes, Luciedi de Cássia Leôncio; Takiyama, Luís Roberto; Wittmann, Florian KarlThis study aims to evaluate the phytosociology and floristic composition of tree species in the eastern Amazon, at the Iratapuru River Sustainable Development Reserve (RDS), State of Amapá. Fouteen quarters with dimensions of 100 m x 100 m were randomly inventoried, and 50 sub-plots of 10 m x 20 m were established. In each sub-plot all living individuals were sampled, being taken from the height data and DAP (b...
The Brazilian freshwater wetscape: Changes in tree community diversity and comp...
Wittmann, Florian Karl; Marques, Márcia Cristina Mendes; Júnior, Geraldo Damasceno D.; Budke, Jean Carlos; Piedade, Maria Teresa FernandezWetlands harbor an important compliment of regional plant diversity, but in many regions data on wetland diversity and composition is still lacking, thus hindering our understanding of the processes that control it. While patterns of broad-scale terrestrial diversity and composition typically correlate with contemporary climate it is not clear to what extent patterns in wetlands are complimentary, or conflictin...
Species Distribution Modelling: Contrasting presence-only models with plot abun...
Gomes, Vitor H.F.; IJff, Stéphanie D.; Raes, Niels; Amaral, Iêda Leão do; Salomão, Rafael Paiva; Coelho, Luiz Souza deSpecies distribution models (SDMs) are widely used in ecology and conservation. Presence-only SDMs such as MaxEnt frequently use natural history collections (NHCs) as occurrence data, given their huge numbers and accessibility. NHCs are often spatially biased which may generate inaccuracies in SDMs. Here, we test how the distribution of NHCs and MaxEnt predictions relates to a spatial abundance model, based on ...
Drought responses of flood-tolerant trees in Amazonian floodplains
Parolin, Pia; Lucas, Christine M.; Piedade, Maria Teresa Fernandez; Wittmann, Florian KarlBackground Flood-tolerant tree species of the Amazonian floodplain forests are subjected to an annual dry period of variable severity imposed when low river-water levels coincide with minimal precipitation. Although the responses of these species to flooding have been examined extensively, their responses to drought, in terms of phenology, growth and physiology, have been neglected hitherto, although some infor...