Phylogeny, biogeography, and rates of diversification of New World Astragalus (Leguminosae) with an emphasis on South American radiations

Rosa A. Scherson, Rodrigo Vidal, Michael Sanderson

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

This study uses phylogenetic relationships of New World representatives of the species-rich genus Astragalus (Leguminosae; Papilionoideae) to follow up on recent evidence pointing to rapid and recent plant diversification patterns in the Andes. Bayesian and maximum likelihood phylogenetic analyses were done using nuclear rDNA ITS and chloroplast spacers trnD-trnT and trnfM-trnS1, either separately or in combination. The effect of using partitioned vs. nonpartitioned analyses in a Bayesian approach was evaluated. Highest resolution was obtained when the data were combined in partitioned or nonpartitioned Bayesian analyses. All phylogenies support two clades of South American species nested within the North American species, implying two separate invasions from North to South America. These two clades correspond to the original morphological classification of lohnston (1947 Journal of the Arnold Arboretum 28: 336-409). The mean ages of the South American clades were very recent but still significantly different (1.89 and 0.98 Ma). Upper and lower bounds on rates of diversification varied between 2.01 and 0.65 species/Ma for the older clade and 2.06 and 1.24 species/Ma for the younger clade. Even the lower bounds are still very high, reasserting Neo-Astragalus in the growing list of recent rapid radiations of plants, especially in areas with a high physiographic diversity, such as the Andes.

Original languageEnglish (US)
Pages (from-to)1030-1039
Number of pages10
JournalAmerican Journal of Botany
Volume95
Issue number8
DOIs
StatePublished - Aug 2008

Fingerprint

Astragalus
Bayes Theorem
Phylogeny
biogeography
Fabaceae
phylogeny
Radiation
South America
Chloroplasts
Ribosomal DNA
Faboideae
phylogenetics
chloroplasts
taxonomy
chloroplast
rate
world
radiation

Keywords

  • Astragalus
  • Biogeography
  • Chloroplast spacers
  • Internal transcribed spacer
  • Leguminosae
  • Phylogeny
  • Rates of diversification

ASJC Scopus subject areas

  • Plant Science

Cite this

Phylogeny, biogeography, and rates of diversification of New World Astragalus (Leguminosae) with an emphasis on South American radiations. / Scherson, Rosa A.; Vidal, Rodrigo; Sanderson, Michael.

In: American Journal of Botany, Vol. 95, No. 8, 08.2008, p. 1030-1039.

Research output: Contribution to journalArticle

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