Repeated evolution of net venation and fleshy fruits among monocots in shaded habitats confirms a priori predictions: evidence from an ndhF phylogeny

TJ Givnish*, JC Pires, SW Graham, MA McPherson, LM Prince, TB Patterson, HS Rai, EH Roalson, TM Evans, WJ Hahn, KC Millam, AW Meerow, M Molvray, PJ Kores, HE O'Brien, JC Hall, WJ Kress, KJ Sytsma

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

86 Citations (Scopus)

Abstract

We present a well-resolved, highly inclusive phylogeny for monocots, based on ndhF sequence variation, and use it to test a priori hypotheses that net venation and vertebrate-dispersed fleshy fruits should undergo concerted convergence, representing independent but often concurrent adaptations to shaded conditions. Our data demonstrate that net venation arose at least 26 times and was lost eight times over the past 90 million years; fleshy fruits arose at least 21 times and disappeared I I times. Both traits show a highly significant pattern of concerted convergence (p <10(-9)), arising 16 times and disappearing four times in tandem. This phenomenon appears driven by even stronger tendencies for both traits to evolve in shade and be lost in open habitats (p <10(-13)-10(-29)). These patterns are among the strongest ever demonstrated for evolutionary convergence in individual traits and the predictability of evolution, and the strongest evidence yet uncovered for concerted convergence. The rate of adaptive shifts per taxon has declined exponentially over the past 90 million years, as expected when large-scale radiations fill adaptive zones.

Original languageEnglish
Pages (from-to)1481-1490
Number of pages10
JournalProceedings of the Royal Society B: Biological Sciences
Volume272
Issue number1571
DOIs
Publication statusPublished - 22 Jul 2005

Keywords

  • adaptation
  • correlated evolution
  • molecular systematics
  • monocotyledons
  • SEED PLANT PHYLOGENY
  • FLOWERING PLANTS
  • SEQUENCE DATA
  • SPECIES-DIVERSITY
  • DIVERGENCE TIMES
  • RBCL
  • ANGIOSPERMS
  • FAMILIES
  • GNETALES
  • CONIFERS

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