Testing for Deperet's Rule (Body Size Increase) in Mammals using Combined Extinct and Extant Data
Testing for Deperet's Rule (Body Size Increase) in Mammals using Combined Extinct and Extant Data
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DOI：
10.1093/sysbio/syv075
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发表时间：
2016-01-01
影响因子：
6.5
通讯作者：
Laurin, Michel
中科院分区：
文献类型：
--
作者：
Bokma, Folmer;Godinot, Marc;Laurin, Michel
进化谱系是否总体上显示出体型增加的趋势一直是人们经常讨论的问题。这种倾向被称为“科普规则”，但因为科普从未假设过它，我们建议以德佩雷的名字重新命名它，他在1907年明确地提出了这一规则。Deperet规则传统上是使用化石数据来研究的，但最近的一些研究使用了当今的物种。虽然一些对新生代胎盘哺乳动物的古生物学研究发现了增加体型的支持，但大多数对现存胎盘的研究都未能发现这种趋势。在这里，我们提出了一种方法，将来自现代物种的信息与贝叶斯系统发育框架中的化石数据相结合。我们将该方法应用于大量现存和灭绝的哺乳动物物种的体重估计，并发现对Deperet规则的有力支持。体型增大的趋势似乎不是由已有物种向更大体型进化所驱动的，而是由与新物种出现相关的过程驱动的。我们的分析表明，来自现存和灭绝物种的互补数据可以极大地改进对宏观进化过程的推断。
Whether or not evolutionary lineages in general show a tendency to increase in body size has often been discussed. This tendency has been dubbed "Cope's rule" but because Cope never hypothesized it, we suggest renaming it after Deperet, who formulated it clearly in 1907. Deperet's rule has traditionally been studied using fossil data, but more recently a number of studies have used present-day species. While several paleontological studies of Cenozoic placental mammals have found support for increasing body size, most studies of extant placentals have failed to detect such a trend. Here, we present a method to combine information from present-day species with fossil data in a Bayesian phylogenetic framework. We apply the method to body mass estimates of a large number of extant and extinct mammal species, and find strong support for Deperet's rule. The tendency for size increase appears to be driven not by evolution toward larger size in established species, but by processes related to the emergence of new species. Our analysis shows that complementary data from extant and extinct species can greatly improve inference of macroevolutionary processes.