Species relationships and divergence times in beeches: new insights from the inclusion of 53 young and old fossils in a birth–death clock model
Renner, SS Grimm, Guido W Kapli, Paschalia Denk, Thomas
Renner, SS
Grimm, Guido W
Kapli, Paschalia
Denk, Thomas
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2016-07-19
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2016-03-06
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beeches
fossil record
fossilized birth-death model
molecular-clock calibration
evolutionary turnover rate
Osmundaceae
evolution
fossil record
fossilized birth-death model
molecular-clock calibration
evolutionary turnover rate
Osmundaceae
evolution
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Abstract
The fossilized birth–death (FBD) model can make use of information contained in multiple fossils representing the same clade, and we here apply this model to infer divergence times in beeches (genus <jats:italic>Fagus</jats:italic>), using 53 fossils and nuclear sequences for all nine species. We also apply FBD dating to the fern clade Osmundaceae, with about 12 living species and 36 fossils. <jats:italic>Fagus</jats:italic> nuclear sequences cannot be aligned with those of other Fagaceae, and we therefore use Bayes factors to choose among alternative root positions. The crown group of <jats:italic>Fagus</jats:italic>
is dated to 53 (62–43) Ma; divergence of the sole American species to 44 (51–39) Ma and divergence between Central European <jats:italic>F. sylvatica</jats:italic> and Eastern Mediterranean <jats:italic>F. orientalis</jats:italic> to 8.7 (20–1.8) Ma, unexpectedly old. The FBD model can accommodate fossils as sampled ancestors or as extinct or unobserved lineages; however, this makes its raw output, which shows all fossils on short or long branches, problematic to interpret. We use hand-drawn depictions and a bipartition network to illustrate the uncertain placements of fossils. Inferred speciation and extinction rates imply approximately 5× higher evolutionary turnover in <jats:italic>Fagus</jats:italic> than in Osmundaceae, fitting a hypothesized low turnover in plants adapted to low-nutrient conditions. This article is part of the themed issue ‘Dating species divergences using rocks and clocks’.
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Renner SS, Grimm GW, KapliP, Denk T. 2016 Species relationships anddivergence times in beeches: new insightsfrom the inclusion of 53 young and old fossilsin a birth –death clock model. Phil.Trans. R. Soc. B 371: 20150135.http://dx.doi.org/10.1098/rstb.2015.0135
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Copyright © 2016 The Author(s) Published by the Royal Society. All rights reserved. The linked article is the published version of the article.
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0962-8436
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1471-2970
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openAccess