![]() Spatial patterns and recent trends in the climate of tropical forest regions. Climate-induced annual variation in canopy tree growth in a Costa Rican tropical rain forest. The El Niño Southern Oscillation, variable fruit production, and famine in a tropical forest. Increased El Niño frequency in a climate model forced by future greenhouse warming. Vegetation history of a site in the central Amazon Basin derived from phytolith and charcoal records from natural soils. Ecological correlates of single-seededness in a woody tropical flora. Character convergence, diversity, and disturbance in tropical rain forest in Guyana. Rainforest fragmentation kills big trees. Biomass collapse in Amazonian forest fragments. Dry and wet deposition in Amazonia: from natural biogenic aerosols to biomass burning impacts. Evidence for large decadal variability in tropical mean radiative energy budget. Effect of interannual climate variability on carbon storage in Amazonian ecosystems. Assessing the response of plant functional types to climatic change in tropical forests. Tropical rain forest tree growth and atmospheric carbon dynamics linked to interannual temperature variation during 1984–2000. Increasing dominance of large lianas in Amazonian forests. Concerted changes in tropical forest structure and dynamics: Evidence from 50 South American long-term plots. Carbon dioxide transfer over a central Amazonian rain forest. Increasing biomass in Amazonian forest plots. Changes in the carbon balance of tropical forest: Evidence from long-term plots. Carbon dioxide uptake by an undisturbed tropical rain forest in southwest Amazonia, 1992 to 1993. (eds) Climate Change 2001: The Scientific Basis (Cambridge Univ. Pattern and process in Amazon tree turnover, 1976–2001. Increasing turnover through time in tropical forests. Growth responses of seedlings of early and late successional tropical forest trees to elevated atmospheric CO2. Competition and patterns of resource use among seedlings of five tropical trees grown at ambient and elevated CO2. High tree species richness on poor soils. These compositional changes could have important impacts on the carbon storage, dynamics and biota of Amazonian forests.ĭe Oliveira, A. Rising atmospheric CO 2 concentrations 6 may explain these changes, although the effects of this and other large-scale environmental alterations remain uncertain. However, genera of faster-growing trees, including many canopy and emergent species, are increasing in dominance or density, whereas genera of slower-growing trees, including many subcanopy species, are declining. Contrary to recent predictions 2, 3, 4, 5, we observed no increase in pioneer trees. ![]() An independent, eight-year study in nearby forests corroborates these shifts in composition. Of 115 relatively abundant tree genera, 27 changed significantly in population density or basal area-a value nearly 14 times greater than that expected by chance. Within these plots, rates of tree mortality, recruitment and growth have increased over time. Our analyses are based on a network of 18 permanent plots unaffected by any detectable disturbance. ![]() Here we show that, over the past two decades, forests in a central Amazonian landscape have experienced highly nonrandom changes in dynamics and composition. Amazonian rainforests are some of the most species-rich tree communities on earth 1. ![]()
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