8 documents found, page 1 of 1
Pervasive gaps in Amazonian ecological research
Carvalho, Raquel L.; Resende, Angelica F.; Barlow, Jos; França, Filipe M.; Moura, Mario R.; Maciel, Rafaella; Alves-Martins, Fernanda; Shutt, JackBiodiversity loss is one of the main challenges of our time,1,2 and attempts to address it require a clear un derstanding of how ecological communities respond to environmental change across time and space.3,4 While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes,5–7 vast areas of the tropics remain underst...
Vascular epiphytic component of “Brejo de altitude” in northeastern Brazil: flo...
Dias-Terceiro, Randolpho Gonçalves; Gomes, Vitor Serrano; Menezes, Marcelo Costa de; Demarchi, Layon Oreste; Fabricante, Juliano RicardoThe Brazilian Northeastern Brejos is an important area of biodiversity in the Atlantic Forest. However, little is known about the species composition of epiphytes in this type of vegetation. The present study aims to characterize the floristic and phytosociological structure of vascular epiphytic components in an area of the Brazilian Northeastern Brejo. All epiphytes occurring in the area were collected and co...
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,...
Logging impact on amazonian white-sand forests: Perspectives from a sustainable...
Demarchi, Layon Oreste; Scudeller, Veridiana Vizoni; Moura, Lívia Carvalho; Lopes, Aline; Piedade, Maria Teresa FernandezOverexploitation is one of the main causes of biodiversity loss and local extinction. In the Brazilian Amazon, the intensive use of high-value timber species is leading to a decline in their populations. When in decline, these species can be replaced by less valuable and more common ones that are more feasible to exploit. We conducted interviews with residents of two communities in a sustainable development res...
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 ...
Floristic composition, structure and soil-vegetation relations in three white-s...
Demarchi, Layon Oreste; Scudeller, Veridiana Vizoni; Moura, Lívia Carvalho; Dias-Terceiro, Randolpho Gonçalves; Lopes, Aline; Wittmann, Florian KarlThe Amazonian white-sand vegetation presents a set of unique features, such as the dominance of a few species, high endemism and low species richness, which differentiate it from other Amazonian forests. Soil parameters have long been recognized as the main drivers of white-sand vegetation (WSV) characteristics. However, how they influence the composition, richness and structure of this vegetation type is still...
Rarity of monodominance in hyperdiverse Amazonian forests
ter Steege, H.; Henkel, Terry W.; Helal, Nora; Marimon, Beatriz Schwantes; Marimon Júnior, Ben Hur; Huth, Andreas; Groeneveld, Jürgen J.Tropical forests are known for their high diversity. Yet, forest patches do occur in the tropics where a single tree species is dominant. Such “monodominant” forests are known from all of the main tropical regions. For Amazonia, we sampled the occurrence of monodominance in a massive, basin-wide database of forest-inventory plots from the Amazon Tree Diversity Network (ATDN). Utilizing a simple defining metric ...
Guia de campo de herbáceas aquáticas: várzea Amazônica
Piedade, Maria Teresa Fernandez; Lopes, Aline; Demarchi, Layon Oreste; Junk, Wolfgang; Wittmann, Florian; Schöngart, Jochen; Cruz, Jefferson daEste guia de campo reúne as espécies mais comuns nas várzeas, especialmente da Amazônia Central, com fotos, ilustrações e esquemas sintetizando o ciclo de vida das plantas ao longo do ciclo hidrológico, com o objetivo de fornecer informações básicas para identificar essas plantas em campo, conhecer sua ecologia e morfologia adaptativa e, adicionalmente, oferecer informações a todos os interessados por seus aspe...