Crocodylian Head Width Allometry and Phylogenetic Prediction of Body Size in Extinct Crocodyliforms.

Crocodylian Head Width Allometry and Phylogenetic Prediction of Body Size in Extinct Crocodyliforms.
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DOI:
10.1093/iob/obz006
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发表时间:
2019
期刊:
Integrative organismal biology (Oxford, England)
影响因子:
--
通讯作者:
Gignac PM
Gignac PM
中科院分区:
其他
文献类型:
--
作者:
O'Brien HD;Lynch LM;Vliet KA;Brueggen J;Erickson GM;Gignac PM

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身体大小和身体大小的变化广泛地影响所有动物的生活史参数,这使得精确估计灭绝类群的身体大小成为了解其古生物学的重要组成部分。在灭绝的鳄鱼和他们的祖先(例如,suchians),已经开发了几种方法来从一套硬组织替代物预测身体大小。然而,由于一些主要的鳄鲛类群体的差异和化石记录的偏见,许多应用有限。在这里,我们测试的效用头宽(HW)作为一个广泛适用的身体大小估计在生活和化石suchians。我们使用一个数据集的性成熟的男性和女性的个人(n = 76),从一个全面的样本,现存的suchian物种,包括几乎所有已知的类群(n = 22)开发贝叶斯系统发育模型预测三个传统的度量大小:体重,口鼻长度,总长度。然后,我们使用该模型来估计已知的系统发育亲和力(Montsechosuchus,Diplocynodon和Sarcosuchus)的一系列灭绝的鳄类动物的大小参数。然后,我们将我们的结果与文献中报道的尺寸进行比较,以验证我们的方法对广泛的化石鳄类的实用性。我们的研究结果表明,HW与所有其他指标高度相关(所有R2≥0.85),并且与股骨尺寸相当,因为它是可靠的体型预测因子。我们提供的R代码,以使其他研究人员在自己的研究中采用该模型。
Body size and body-size shifts broadly impact life-history parameters of all animals, which has made accurate body-size estimates for extinct taxa an important component of understanding their paleobiology. Among extinct crocodylians and their precursors (e.g., suchians), several methods have been developed to predict body size from suites of hard-tissue proxies. Nevertheless, many have limited applications due to the disparity of some major suchian groups and biases in the fossil record. Here, we test the utility of head width (HW) as a broadly applicable body-size estimator in living and fossil suchians. We use a dataset of sexually mature male and female individuals (n = 76) from a comprehensive sample of extant suchian species encompassing nearly all known taxa (n = 22) to develop a Bayesian phylogenetic model for predicting three conventional metrics for size: body mass, snout–vent length, and total length. We then use the model to estimate size parameters for a select series of extinct suchians with known phylogenetic affinity (Montsechosuchus, Diplocynodon, and Sarcosuchus). We then compare our results to sizes reported in the literature to exemplify the utility of our approach for a broad array of fossil suchians. Our results show that HW is highly correlated with all other metrics (all R2≥0.85) and is commensurate with femoral dimensions for its reliably as a body-size predictor. We provide the R code in order to enable other researchers to employ the model in their own research.
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