Body temperatures in dinosaurs: what can growth curves tell us?
Body temperatures in dinosaurs: what can growth curves tell us?
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DOI：
10.1371/journal.pone.0074317
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Griebeler EM
中科院分区：
文献类型：
--
作者：
Griebeler EM
为了估计七只恐龙的体温（BT），使用了一个方程，该方程从体重和最大生长率（MGR）预测BT，后者保存在个体发育生长轨迹中（BT方程）。这些作者的研究结果证明了恐龙的惯性恒温，并表明，由于过热，恐龙的最大身体尺寸最终受到BT的限制。在本文中，我重新审视了这一假设。我首先研究了从今天的鳄鱼，鸟类和哺乳动物的BT方程得出的BT是否与动物的核心温度一致。第二，我把BT方程应用到了更多的恐龙身上。特别是，我估计了始祖鸟（两个MGR），鸟臀目（两个），兽脚亚目（三个），原蜥脚类（三个）和蜥脚类（九个）的BT。对于现存物种，从BT方程估计的BT值是一个贫穷的估计动物的核心温度。对于鸟类，BT总是被严重高估，而对于鳄鱼，BT总是被低估;对于哺乳动物，BT的准确性适中。我认为，在MGR的缩放（截距和指数的回归线，对数-对数转换）和参数化的Arkyius模型中使用的BT方程以及物种的生态和进化适应的分类特异性差异导致这些不准确。不管发现的不准确的BT估计从BT方程和相反的结果，我发现没有增加BT与增加体重在所有恐龙（蜥脚类，蜥脚类）的研究。这一观察结果质疑，由于过热，恐龙的最大尺寸最终受到BT的限制。然而，从BT方程推导出的阿留申式BT的普遍高度不准确性使得不可能可靠地测试恐龙的身体大小最终是否受到过热的限制。
To estimate the body temperature (BT) of seven dinosaurs used an equation that predicts BT from the body mass and maximum growth rate (MGR) with the latter preserved in ontogenetic growth trajectories (BT-equation). The results of these authors evidence inertial homeothermy in Dinosauria and suggest that, due to overheating, the maximum body size in Dinosauria was ultimately limited by BT. In this paper, I revisit this hypothesis of. I first studied whether BTs derived from the BT-equation of today’s crocodiles, birds and mammals are consistent with core temperatures of animals. Second, I applied the BT-equation to a larger number of dinosaurs than did. In particular, I estimated BT of Archaeopteryx (from two MGRs), ornithischians (two), theropods (three), prosauropods (three), and sauropods (nine). For extant species, the BT value estimated from the BT-equation was a poor estimate of an animal’s core temperature. For birds, BT was always strongly overestimated and for crocodiles underestimated; for mammals the accuracy of BT was moderate. I argue that taxon-specific differences in the scaling of MGR (intercept and exponent of the regression line, log-log-transformed) and in the parameterization of the Arrhenius model both used in the BT-equation as well as ecological and evolutionary adaptations of species cause these inaccuracies. Irrespective of the found inaccuracy of BTs estimated from the BT-equation and contrary to the results of I found no increase in BT with increasing body mass across all dinosaurs (Sauropodomorpha, Sauropoda) studied. This observation questions that, due to overheating, the maximum size in Dinosauria was ultimately limited by BT. However, the general high inaccuracy of dinosaurian BTs derived from the BT-equation makes a reliable test of whether body size in dinosaurs was ultimately limited by overheating impossible.
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影响因子：
3.7
作者：
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