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Title: Insights into regional patterns of Amazonian forest structure, diversity, and dominance from three large terra-firme forest dynamics plots
Authors: Duque M, Alvaro J.
Muller-Landau, Helene C.
Valencia, Renato L.
Cárdenas, Dairón
Davies, Stuart James
Oliveira, Alexandre Adalardo de
Peréz, Álvaro J.
Romero-Saltos, Hugo
Vicentini, Alberto
Keywords: Aboveground Biomass
Conservation Management
Forest Dynamics
Geographical Variation
Rare Species
Regional Pattern
Species Diversity
Species Richness
Stand Structure
Issue Date: 2017
metadata.dc.publisher.journal: Biodiversity and Conservation
metadata.dc.relation.ispartof: Volume 26, Número 3, Pags. 669-686
Abstract: We analyze forest structure, diversity, and dominance in three large-scale Amazonian forest dynamics plots located in Northwestern (Yasuni and Amacayacu) and central (Manaus) Amazonia, to evaluate their consistency with prevailing wisdom regarding geographic variation and the shape of species abundance distributions, and to assess the robustness of among-site patterns to plot area, minimum tree size, and treatment of morphospecies. We utilized data for 441,088 trees (DBH ≥1 cm) in three 25-ha forest dynamics plots. Manaus had significantly higher biomass and mean wood density than Yasuni and Amacayacu. At the 1-ha scale, species richness averaged 649 for trees ≥1 cm DBH, and was lower in Amacayacu than in Manaus or Yasuni; however, at the 25-ha scale the rankings shifted, with Yasuni < Amacayacu < Manaus. Within each site, Fisher’s alpha initially increased with plot area to 1–10 ha, and then showed divergent patterns at larger areas depending on the site and minimum size. Abundance distributions were better fit by lognormal than by logseries distributions. Results were robust to the treatment of morphospecies. Overall, regional patterns in Amazonian tree species diversity vary with the spatial scale of analysis and the minimum tree size. The minimum area to capture local diversity is 2 ha for trees ≥1 cm DBH, or 10 ha for trees ≥10 cm DBH. The underlying species abundance distribution for Amazonian tree communities is lognormal, consistent with the idea that the rarest species have not yet been sampled. Enhanced sampling intensity is needed to fill the still large voids we have in plant diversity in Amazon forests. © 2016, Springer Science+Business Media Dordrecht.
metadata.dc.identifier.doi: 10.1007/s10531-016-1265-9
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