Affordable Access

deepdyve-link
Publisher Website

Phylogenetic signatures of ecological divergence and leapfrog adaptive radiation in Espeletia.

Authors
  • Pouchon, Charles1
  • Lavergne, Sébastien1
  • Fernández, Ángel2
  • Alberti, Adriana3
  • Aubert, Serge1, 4
  • Mavárez, Jesús1
  • 1 Laboratoire d'Ecologie Alpine (LECA), Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, F-38000, Grenoble, France. , (France)
  • 2 Herbario IVIC. Instituto Venezolano de Investigaciones Científicas, Apartado 20632, Caracas, 1020-A, Venezuela. , (Venezuela)
  • 3 Génomique Métabolique, Genoscope, Institut François Jacob, CEA, CNRS, Université Evry, Université Paris-Saclay, 91057, Evry, France. , (France)
  • 4 Université Grenoble Alpes, CNRS, Université Savoie Mont Blanc, SAJF, Station Alpine Joseph Fourier, 38000, Grenoble, France. , (France)
Type
Published Article
Journal
American Journal of Botany
Publisher
Wiley (John Wiley & Sons)
Publication Date
Jan 01, 2021
Volume
108
Issue
1
Pages
113–128
Identifiers
DOI: 10.1002/ajb2.1591
PMID: 33426651
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Events of accelerated species diversification represent one of Earth's most celebrated evolutionary outcomes. Northern Andean high-elevation ecosystems, or páramos, host some plant lineages that have experienced the fastest diversification rates, likely triggered by ecological opportunities created by mountain uplifts, local climate shifts, and key trait innovations. However, the mechanisms behind rapid speciation into the new adaptive zone provided by these opportunities have long remained unclear. We address this issue by studying the Venezuelan clade of Espeletia, a species-rich group of páramo-endemics showing a dazzling ecological and morphological diversity. We performed several comparative analyses to study both lineage and trait diversification, using an updated molecular phylogeny of this plant group. We showed that sets of either vegetative or reproductive traits have conjointly diversified in Espeletia along different vegetation belts, leading to adaptive syndromes. Diversification in vegetative traits occurred earlier than in reproductive ones. The rate of species and morphological diversification showed a tendency to slow down over time, probably due to diversity dependence. We also found that closely related species exhibit significantly more overlap in their geographic distributions than distantly related taxa, suggesting that most events of ecological divergence occurred at close geographic proximity within páramos. These results provide compelling support for a scenario of small-scale ecological divergence along multiple ecological niche dimensions, possibly driven by competitive interactions between species, and acting sequentially over time in a leapfrog pattern. © 2021 Botanical Society of America.

Report this publication

Statistics

Seen <100 times