Radiations and key innovations in an early branching angiosperm lineage (Annonaceae; Magnoliales)

R.H.J. Erkens, L.W. Chatrou, T.L.P. Couvreur

Research output: Contribution to journalArticleAcademicpeer-review

30 Citations (Scopus)

Abstract

Biologists are fascinated by species-rich groups and have attempted to discover the causes for their abundant diversification. Comprehension of the causes and mechanisms underpinning radiations and detection of their frequency will contribute greatly to the understanding of the evolutionary origin of biodiversity and its ecological structure. A dated and well-resolved phylogenetic tree of Annonaceae was used to study diversification patterns in the family in order to identify factors that drive speciation and the evolution of morphological (key) characters. It was found that, except for Goniothalamus, the largest genera in the family are not the result of radiations. Furthermore, the difference in species numbers between subfamilies Annonoideae (former long branch clade) and Malmeoideae (former short branch clade) cannot be attributed to significant differences in the diversification rate. Most of the speciation in Annonaceae is not distinguishable from a random branching process (i.e. chance), and no special explanations are therefore necessary for the distribution of species richness across the major part of the phylogenetic tree for Annonaceae. Only for a small number of clades can key innovations be invoked to explain the elevated rate of diversification
Original languageEnglish
Pages (from-to)117-134
JournalBotanical Journal of the Linnean Society
Volume169
Issue number1
DOIs
Publication statusPublished - 2012

Keywords

  • rain-forest trees
  • species-rich genus
  • adaptive radiation
  • diversification rates
  • rapid diversification
  • goniothalamus annonaceae
  • molecular phylogenetics
  • ecological opportunity
  • guatteria annonaceae
  • flowering plants

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