Skip to main content

Phylogenetic relationships between disjunctly occurring groups of Tristicha trifaria (Podostemaceae)

Buy Article:

$43.00 plus tax (Refund Policy)

Abstract Aim 

To reveal the phylogeographic relationship of disjunct specimens of Tristicha trifaria (Bory ex Willd.) Spreng., a member of the Podostemaceae river-weed family, which is distributed exceptionally widely, but disjunctly, in Africa and the Americas. Location 

Brazil, Mexico, Ghana, Tanzania and Madagascar. Methods 

The chloroplast matK and rbcL genes, a trnK intron, the trnS-trnG intergenic spacer (IGS), the two IGSs of trnT-trnL-trnF, a trnL intron, and nuclear ribosomal ITS regions were sequenced and analysed. Phylogenetic analyses were conducted using maximum likelihood and maximum parsimony methods. Results 

The T. trifaria samples analysed were separated into two groups in a rooted tree based on a combined matK/rbcL/ITS dataset; one contained the West African and all of the American samples, and the other contained the East African and Madagascan samples. An unrooted tree obtained from a combined analysis of all the chloroplast DNA and nuclear ITS data showed that a sample from West Africa was sister to an American T. trifaria group. Main conclusions 

The American and West African T. trifaria are closely related, despite the great distance between their locations. This observation, along with a tree of the whole Tristichoideae subfamily and estimated divergence times, suggests that an ancestor of T. trifaria migrated from Asia to Africa during the early Tertiary, and that this was followed by further westward migration to the Americas at the end of the Miocene or in the early Pliocene.
No References
No Citations
No Supplementary Data
No Article Media
No Metrics

Keywords: Biogeography; Podostemaceae; Tristicha trifaria; disjunct distribution; long-distance dispersal; molecular phylogeny

Document Type: Research Article

Publication date: 2004-10-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more