uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
All we need now is fossils; a new phylogenetic dating method (PATHd8) allowing thousands of taxa and multiple fossil constraints.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Department of Evolution, Genomics and Systematics. Systematisk botanik.
2006 (English)In: Ancient life and modern approaches: Abstracts of the second International Paleontological Congress, 2006, 45- p.Conference paper (Refereed)
Abstract [en]

Estimation of divergence times in phylogenetic trees using sequence data

becomes increasingly popular, but so far dating studies have given widely different results,

and especially datings of the lower nodes within the angiosperms and metazoans, have given

much older ages than those obtained from the fossil record. It has been concluded in different

studies that more taxa, and more fossils are needed for more reliable age estimates. For this

reason, a dating method that can handle very large data sets with multiple fossil constraints is


Chronograms obtained by e.g. penalized likelihood and Bayesian methods, often

adds a large "ghost range" to the fossil record, and produces chronograms with a more or less

smooth appearance, even if the corresponding phylograms have apparently very

heterogeneous rates. Compared to the other methods, our recently developed method,

PATHd8, gives the results with the best agreement with the fossil record, which coincides

with the least smooth appearance of the chronograms. When other programs often run into

computational problems when analysing trees with hundreds of leaves, PATHd8 has no

problems analysing thousands of taxa instantaneously. An arbitrary number of fossil age

constraints can be specified, either as fixed-, minimum or maximum age.

With our new method, the biggest problem in dating studies is that we need

more fossils, and these fossils must be well dated and assigned to the correct branches of the

phylogeny. Therefore, to accomplish divergence time estimates, which hopefully approximate

the real ages, biologists now need to cooperate with palaeontologists.

Place, publisher, year, edition, pages
2006. 45- p.
Keyword [en]
divergence time, dating, PATHd8, phylogeny, fossil
National Category
Geology Biological Systematics Computational Mathematics
URN: urn:nbn:se:uu:diva-24382ISBN: 7-312-01956-0OAI: oai:DiVA.org:uu-24382DiVA: diva2:52156
Available from: 2007-02-05 Created: 2007-02-05

Open Access in DiVA

No full text

By organisation
Department of Evolution, Genomics and Systematics
GeologyBiological SystematicsComputational Mathematics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 217 hits
ReferencesLink to record
Permanent link

Direct link