Angiosperm divergence times: congruence and incongruence between fossils and sequence divergence estimates
2003 (English)In: Telling the Evolutionary Time: Molecular Clocks and the Fossil Record, Taylor & Francis , 2003, 142-165 p.Chapter in book (Refereed)
The documentation of derived angiosperm lineages from increasingly older geological deposits, and growing evidence of considerable diversity in ower, seed, and pollen morphology in the mid-Cretaceous both imply that the timing of early angiosperm cladogenesis may be older then our current fossil-based estimates indicate. An alternative to fossils for calibrating the phylogenetic tree comes from divergence in DNA sequence data. Here, we report on an analysis using non-parametric rate smoothing and a three gene dataset covering c. 75 per cent of all angiosperm families recognized in recent classi cations. The results provide an initial hypothesis of angiosperm diversi cation times; by using an internal calibration point, an independent evaluation of angiosperm and eudicot origins is accomplished. Results are compared with fossil-based estimates of both magnolids and eudicot divergence times, and possible directions of future analyses are discussed.
Place, publisher, year, edition, pages
Taylor & Francis , 2003. 142-165 p.
IdentifiersURN: urn:nbn:se:uu:diva-47918ISBN: 0415275245OAI: oai:DiVA.org:uu-47918DiVA: diva2:75825