12 documents found, page 1 of 2
Pre-Columbian soil fertilization and current management maintain food resource ...
Levis, Carolina; Pena-Claros, Marielos; Clement, Charles Roland; Costa, Flávia Regina Capellotto; Alves, Rubana Palhares; Ferreira, Maria JuliaAims: The extent and persistence of pre-Columbian human legacies in old-growth Amazonian forests are still controversial, partly because modern societies re-occupied old settlements, challenging the distinction between pre- and post-Columbian legacies. Here, we compared the effects of pre-Columbian vs. recent landscape domestication processes on soils and vegetation in two Amazonian regions. Methods: We studied...
Response to Comment on "persistent effects of pre-Columbian plant domestication...
Junqueira, André Braga; Levis, Carolina; Bongers, Frans; Pena-Claros, Marielos; Clement, Charles Roland; Costa, Flávia Regina CapellottoMcMichael et al. state that we overlooked the effects of post-Columbian human activities in shaping current floristic patterns in Amazonian forests. We formally show that post- Columbian human influences on Amazonian forests are indeed important, but they have played a smaller role when compared to the persistent effects of pre-Columbian human activities on current forest composition..
Land use as a filter for species composition in Amazonian secondary forests
Jakovac, Catarina Conte; Bongers, Frans; Kuyper, Thomas W.; Mesquita, Rita de Cássia Guimarães; Pena-Claros, MarielosQuestions: Secondary succession in the tropics can follow alternative pathways. Land-use history is known to engender alternative successional communities, but the underlying mechanisms driving and sustaining divergence remain unclear. In this study we aim to answer the following questions: (1) does previous land use act as a filter for species composition in secondary forests; and (2) what are the relative rol...
Biodiversity recovery of Neotropical secondary forests
Rozendaal, Danaë M.A.; Bongers, Frans; Aide, T. Mitchell; Álvarez-Dávila, Esteban; Ascarrunz, Nataly L.; Balvanera, Patricia; Becknell, Justin M.Old-growth tropical forests harbor an immense diversity of tree species but are rapidly being cleared, while secondary forests that regrow on abandoned agricultural lands increase in extent. We assess how tree species richness and composition recover during secondary succession across gradients in environmental conditions and anthropogenic disturbance in an unprecedented multisite analysis for the Neotropics. S...
Seasonal drought limits tree species across the Neotropics
Esquivel-Muelbert, Adriane; Baker, Timothy R.; Dexter, Kyle Graham; Lewis, Simon L.; ter Steege, H.; Lopez-Gonzalez, Gabriela; Monteagudo-Mendoza, AbelWithin the tropics, the species richness of tree communities is strongly and positively associated with precipitation. Previous research has suggested that this macroecological pattern is driven by the negative effect of water-stress on the physiological processes of most tree species. This implies that the range limits of taxa are defined by their ability to occur under dry conditions, and thus in terms of spe...
Hyperdominance in Amazonian forest carbon cycling
Fauset, Sophie; Johnson, Michelle O.; Gloor, Manuel U.; Baker, Timothy R.; Monteagudo M, Abel; Brienen, Roel J.W.; Feldpausch, Ted R.While Amazonian forests are extraordinarily diverse, the abundance of trees is skewed strongly towards relatively few â € hyperdominantâ €™ species. In addition to their diversity, Amazonian trees are a key component of the global carbon cycle, assimilating and storing more carbon than any other ecosystem on Earth. Here we ask, using a unique data set of 530 forest plots, if the functions of storing and produci...
Spatial and temporal dynamics of shifting cultivation in the middle-Amazonas ri...
Jakovac, Catarina Conte; Dutrieux, Lo?c Paul; Siti, Latifah; Pena-Claros, Marielos; Bongers, FransShifting cultivation is the main land-use system transforming landscapes in riverine Amazonia. Increased concentration of the human population around villages and increasing market integration during the last decades may be causing agricultural intensification. Studies have shown that agricultural intensification, i.e. higher number of swidden-fallow cycles and shorter fallow periods, reduces crop productivity ...
How people domesticated Amazonian forests
Levis, Carolina; Flores, Bernardo Monteiro; Moreira, Priscila Ambrósio; Luize, Bruno Garcia; Alves, Rubana Palhares; Franco-Moraes, JulianoFor millennia, Amazonian peoples have managed forest resources, modifying the natural environment in subtle and persistent ways. Legacies of past human occupation are striking near archaeological sites, yet we still lack a clear picture of how human management practices resulted in the domestication of Amazonian forests. The general view is that domesticated forests are recognizable by the presence of forest pa...
Carbon sequestration potential of second-growth forest regeneration in the Lati...
Chazdon, Robin L.; Broadbent, Eben N.; Rozendaal, Danaë M.A.; Bongers, Frans; Zambrano, Angélica María Almeyda; Aide, T. Mitchell; Balvanera, PatriciaRegrowth of tropical secondary forests following complete or nearly complete removal of forest vegetation actively stores carbon in aboveground biomass, partially counterbalancing carbon emissions from deforestation, forest degradation, burning of fossil fuels, and other anthropogenic sources. We estimate the age and spatial extent of lowland second-growth forests in the Latin American tropics and model their p...
Compositional response of Amazon forests to climate change
Esquivel-Muelbert, Adriane; Baker, Timothy R.; Dexter, Kyle Graham; Lewis, Simon L.; Brienen, Roel J.W.; Feldpausch, Ted R.; Lloyd, JonMost of the planet's diversity is concentrated in the tropics, which includes many regions undergoing rapid climate change. Yet, while climate-induced biodiversity changes are widely documented elsewhere, few studies have addressed this issue for lowland tropical ecosystems. Here we investigate whether the floristic and functional composition of intact lowland Amazonian forests have been changing by evaluating ...