Bicknell Russell D C, Collins Katie S, Crundwell Martin, Hannah Michael, Crampton James S, Campione Nicolás E
Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale 2351, Australia.
Department of the Geophysical Sciences, University of Chicago, 5734 South Ellis Avenue, Chicago, IL 60637, USA.
iScience. 2018 Oct 26;8:295-303. doi: 10.1016/j.isci.2018.09.013. Epub 2018 Oct 17.
The fossil record provides empirical patterns of morphological change through time and is central to the study of the tempo and mode of evolution. Here we apply likelihood-based time-series analyses to the near-continuous fossil record of Neogene planktonic foraminifera and reveal a morphological shift along the Truncorotalia lineage. Based on a geometric morphometric dataset of 1,459 specimens, spanning 5.9-4.5 Ma, we recover a shift in the mode of evolution from a disparate latest Miocene morphospace to a highly constrained early Pliocene morphospace. Our recovered dynamics are consistent with those stipulated by Simpson's quantum evolution and Eldredge-Gould's punctuated equilibria and supports previous suppositions that even within a single lineage, evolutionary dynamics require a multi-parameter model framework to describe. We show that foraminiferal lineages are not necessarily gradual and can experience significant and rapid transitions along their evolutionary trajectories and reaffirm the utility of multivariate datasets for their future research.
化石记录提供了随时间变化的形态变化的实证模式，是研究进化的速度和模式的核心。在这里，我们将基于似然性的时间序列分析应用于新近纪浮游有孔虫的近乎连续的化石记录，并揭示了Truncorotalia谱系中的形态转变。基于一个跨越590万至450万年的1459个标本的几何形态测量数据集，我们发现了进化模式从最晚中新世不同的形态空间到上新世早期高度受限的形态空间的转变。我们恢复的动力学与辛普森的量子进化和埃尔德雷奇 - 古尔德的间断平衡所规定的动力学一致，并支持先前的假设，即即使在单个谱系内，进化动力学也需要一个多参数模型框架来描述。我们表明，有孔虫谱系不一定是渐进的，并且在其进化轨迹上可以经历显著而快速的转变，并重申多变量数据集在其未来研究中的实用性。
