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Re: Dinosaur growth rates revisited



Ben Creisler
bcreisler@gmail.com

Two responses online in Nature:


Gregory M. Erickson, Peter J. Makovicky, Philip J. Currie, Mark A.
Norell, Scott A. Yerby
& Christopher A. Brochu (2015)
Corrigendum: Gigantism and comparative life-history parameters of
tyrannosaurid dinosaurs.
Nature (advance online publication)
doi:10.1038/nature16487
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature16487.html

Gregory M. Erickson, Kristina Curry Rogers & Scott A. Yerby (2015)
Corrigendum: Dinosaurian growth patterns and rapid avian growth rates.
Nature (advance online publication)
doi:10.1038/nature16488
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature16488.html

On Mon, Dec 16, 2013 at 2:26 PM, Ben Creisler <bcreisler@gmail.com> wrote:
> From: Ben Creisler
> bcreisler@gmail.com
>
> New in PLoS ONE:
>
> Nathan P. Myhrvold (2013)
> Revisiting the Estimation of Dinosaur Growth Rates.
> PLoS ONE 8(12): e81917.
> doi:10.1371/journal.pone.0081917
> http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0081917
>
>
> Previous growth-rate studies covering 14 dinosaur taxa, as represented
> by 31 data sets, are critically examined and reanalyzed by using
> improved statistical techniques. The examination reveals that some
> previously reported results cannot be replicated by using the methods
> originally reported; results from new methods are in many cases
> different, in both the quantitative rates and the qualitative nature
> of the growth, from results in the prior literature. Asymptotic growth
> curves, which have been hypothesized to be ubiquitous, are shown to
> provide best fits for only four of the 14 taxa. Possible reasons for
> non-asymptotic growth patterns are discussed; they include systematic
> errors in the age-estimation process and, more likely, a bias toward
> younger ages among the specimens analyzed. Analysis of the data sets
> finds that only three taxa include specimens that could be considered
> skeletally mature (i.e., having attained 90% of maximum body size
> predicted by asymptotic curve fits), and eleven taxa are quite
> immature, with the largest specimen having attained less than 62% of
> predicted asymptotic size. The three taxa that include skeletally
> mature specimens are included in the four taxa that are best fit by
> asymptotic curves. The totality of results presented here suggests
> that previous estimates of both maximum dinosaur growth rates and
> maximum dinosaur sizes have little statistical support. Suggestions
> for future research are presented.