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首页> 美国卫生研究院文献>PLoS Clinical Trials >Formal comment on: Myhrvold (2016) Dinosaur metabolism and the allometry of maximum growth rate. PLoS ONE; 11(11): e0163205
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Formal comment on: Myhrvold (2016) Dinosaur metabolism and the allometry of maximum growth rate. PLoS ONE; 11(11): e0163205

机译：正式评论：Myhrvold（2016）恐龙代谢与最大生长的异速生长。一等奖; 11（11）：e0163205

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In his 2016 paper, Myhrvold criticized ours from 2014 on maximum growth rates (Gmax, maximum gain in body mass observed within a time unit throughout an individual’s ontogeny) and thermoregulation strategies (ectothermy, endothermy) of 17 dinosaurs. In our paper, we showed that Gmax values of similar-sized extant ectothermic and endothermic vertebrates overlap. This strongly questions a correct assignment of a thermoregulation strategy to a dinosaur only based on its Gmax and (adult) body mass (M). Contrary, Gmax separated similar-sized extant reptiles and birds (Sauropsida) and Gmax values of our studied dinosaurs were similar to those seen in extant similar-sized (if necessary scaled-up) fast growing ectothermic reptiles. Myhrvold examined two hypotheses (H1 and H2) regarding our study. However, we did neither infer dinosaurian thermoregulation strategies from group-wide averages (H1) nor were our results based on that Gmax and metabolic rate (MR) are related (H2). In order to assess whether single dinosaurian Gmax values fit to those of extant endotherms (birds) or of ectotherms (reptiles), we already used a method suggested by Myhrvold to avoid H1, and we only discussed pros and cons of a relation between Gmax and MR and did not apply it (H2). We appreciate Myhrvold’s efforts in eliminating the correlation between Gmax and M in order to statistically improve vertebrate scaling regressions on maximum gain in body mass. However, we show here that his mass-specific maximum growth rate (kC) replacing Gmax (= MkC) does not model the expected higher mass gain in larger than in smaller species for any set of species. We also comment on, why we considered extant reptiles and birds as reference models for extinct dinosaurs and why we used phylogenetically-informed regression analysis throughout our study. Finally, we question several arguments given in Myhrvold in order to support his results.
机译：Myhrvold在2016年的论文中批评了我们从2014年开始的17种恐龙的最大增长率（Gmax，整个个体个体内在一个时间单位内观察到的最大体重增加）和温度调节策略（体温，吸热）。在我们的论文中，我们表明相似大小的现存的吸热和吸热脊椎动物的Gmax值重叠。这强烈质疑仅根据恐龙的Gmax和（成人）体重（M）对恐龙的温度调节策略的正确分配。相反，Gmax分离了相似大小的现存爬行动物和鸟类（Sauropsida），我们研究的恐龙的Gmax值与现存的相似大小（如有必要，按比例放大）的速生爬行动物相似。 Myhrvold检查了关于我们研究的两个假设（H1和H2）。但是，我们既没有从全组平均值（H1）推论出恐龙的体温调节策略，也没有基于Gmax和代谢率（MR）相关（H2）得出的结果。为了评估单个恐龙的Gmax值是否适合现有的吸热（鸟）或外吸（爬行动物）的值，我们已经使用Myhrvold提出的避免H1的方法，并且我们仅讨论了Gmax与MR并没有应用它（H2）。我们赞赏Myhrvold为消除Gmax与M之间的相关性而做出的努力，以统计地改善脊椎动物在最大体重增加方面的尺度回归。但是，我们在这里显示出，他的质量特定最大增长率（kC）替代了Gmax（= MkC），并未对任何种类的物种的大型物种比较小物种的预期更高的质量增益进行建模。我们还评论一下，为什么我们考虑将现存的爬行动物和鸟类作为灭绝恐龙的参考模型，以及为什么在整个研究过程中使用了系统发育信息回归分析。最后，我们质疑Myhrvold中提出的几个论据以支持他的结果。

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