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Clock model makes a large difference to age estimates of long-stemmed clades with no internal calibration: a test using Australian grasstrees

Crisp, Michael D.; Hardy, Nate B.; Cook, Lyn G.

Description

BACKGROUND: Estimating divergence times in phylogenies using a molecular clock depends on accurate modeling of nucleotide substitution rates in DNA sequences. Rate heterogeneity among lineages is likely to affect estimates, especially in lineages with long stems and short crowns ("broom" clades) and no internal calibration. We evaluate the performance of the random local clocks model (RLC) and the more routinely employed uncorrelated lognormal relaxed clock model (UCLN) in situations in which a...[Show more]

CollectionsANU Research Publications
Date published: 2014-12-19
Type: Journal article
URI: http://hdl.handle.net/1885/13294
Source: BMC Evolutionary Biology
DOI: 10.1186/s12862-014-0263-3

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