Low Phylogenetic Beta Diversity and Geographic Neo-endemism in Amazonian White-sand Forests

Juan Ernesto Guevara*, Gabriel Damasco, Christopher Baraloto, Paul V.A. Fine, María Cristina Peñuela, Carolina Castilho, Alberto Vincentini, Dairón Cárdenas, Florian Wittmann, Natalia Targhetta, Oliver Phillips, Juliana Stropp, Ieda Amaral, Paul Maas, Abel Monteagudo, Eliana M. Jimenez, Rachel Thomas, Roel Brienen, Álvaro Duque, William MagnussonCid Ferreira, Eurídice Honorio, Francisca de Almeida Matos, Freddy R. Arevalo, Julien Engel, Pascal Petronelli, Rodolfo Vasquez, Hans ter Steege

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Over the past three decades, many small-scale floristic studies of white-sand forests across the Amazon basin have been published. Nonetheless, a basin-wide description of both taxonomic and phylogenetic alpha and beta diversity at regional scales has never been achieved. We present a complete floristic analysis of white-sand forests across the Amazon basin including both taxonomic and phylogenetic diversity. We found strong regional differences in the signal of phylogenetic community structure with both overall and regional Net Relatedness Index and Nearest Taxon Index values found to be significantly positive leading to a pattern of phylogenetic clustering. Additionally, we found high taxonomic dissimilarity but low phylogenetic dissimilarity in pairwise community comparisons. These results suggest that recent diversification has played an important role in the assembly of white-sand forests causing geographic neo-endemism patterns at the regional scale.

Original languageEnglish
Pages (from-to)34-46
Number of pages13
JournalBiotropica
Volume48
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Amazon
  • Neo-endemism
  • Phylogenetic beta diversity
  • Recent diversification
  • White sands

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