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Re: Post–K-Pg Radiation of Placentals



On Fri, Aug 09, 2013 at 09:24:17PM +0200, David Černý wrote:
> The first response to the paper (as well as the authors' rebuttal):
> 
> Springer MS, Meredith RW, Teeling EC, Murphy WJ 2013 Technical comment
> on "The placental mammal ancestor and the post-K-Pg radiation of
> placentals". Science 341(6146): 613
> http://www.sciencemag.org/content/341/6146/613.2.full

On the face of it, that would be hard to believe.

Ruben


> 
> O'Leary et al. (Research Article, 8 February 2013, p. 662) examined
> mammalian relationships and divergence times and concluded that a
> single placental ancestor crossed the Cretaceous-Paleogene (K-Pg)
> boundary. This conclusion relies on phylogenetic analyses that fail to
> discriminate between homology and homoplasy and further implies
> virus-like rates of nucleotide substitution in early Paleocene
> placentals.
> 
> O'Leary MA, Bloch JI, Flynn JJ, Gaudin TJ, Giallombardo A, Giannini
> NP, Goldberg SL, Kraatz BP, Luo Z-X, Meng J, Ni X, Novacek MJ, Perini
> FA, Randall Z, Rougier GW, Sargis EJ, Silcox MT, Simmons NB, Spaulding
> M, Velazco PM, Weksler M, Wible JR, Cirranello AL 2013 Response to
> comment on "The placental mammal ancestor and the post-K-Pg radiation
> of placentals". Science 341(6146): 613
> http://www.sciencemag.org/content/341/6146/613.3.full
> 
> Tree-building with diverse data maximizes explanatory power.
> Application of molecular clock models to ancient speciation events
> risks a bias against detection of fast radiations subsequent to the
> Cretaceous-Paleogene (K-Pg) event. Contrary to Springer et al.,
> post-K-Pg placental diversification does not require "virus-like"
> substitution rates. Even constraining clade ages to their model, the
> explosive model best explains placental evolution.
> 
> -- 
> David Černý

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