4.8 Article

Why abundant tropical tree species are phylogenetically old

Publisher

NATL ACAD SCIENCES
DOI: 10.1073/pnas.1314992110

Keywords

phylogeny; phylogenetic age; Barro Colorado Island (BCI); niche hypothesis

Funding

  1. Carbon Mitigation Initiative (CMI) of the Princeton Environmental Institute
  2. National Natural Science Foundation of China [31021001]
  3. China Scholarship Council
  4. CMI
  5. National Science Foundation
  6. Center for Tropical Forest Science (CTFS)
  7. Smithsonian Tropical Research Institute
  8. John D. and Catherine T. MacArthur Foundation
  9. Mellon Foundation
  10. Small World Institute Fund

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Neutral models of species diversity predict patterns of abundance for communities in which all individuals are ecologically equivalent. These models were originally developed for Panamanian trees and successfully reproduce observed distributions of abundance. Neutral models also make macroevolutionary predictions that have rarely been evaluated or tested. Here we show that neutral models predict a humped or flat relationship between species age and population size. In contrast, ages and abundances of tree species in the Panamanian Canal watershed are found to be positively correlated, which falsifies the models. Speciation rates vary among phylogenetic lineages and are partially heritable from mother to daughter species. Variable speciation rates in an otherwise neutral model lead to a demographic advantage for species with low speciation rate. This demographic advantage results in a positive correlation between species age and abundance, as found in the Panamanian tropical forest community.

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