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DOI | 10.1073/pnas.1819366116 |
Trilobite evolutionary rates constrain the duration of the Cambrian explosion | |
Paterson, John R.1; Edgecombe, Gregory D.2; Lee, Michael S. Y.3,4 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:10页码:4394-4399 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; England |
英文摘要 | Trilobites are often considered exemplary for understanding the Cambrian explosion of animal life, due to their unsurpassed diversity and abundance. These biomineralized arthropods appear abruptly in the fossil record with an established diversity, phylogenetic disparity, and provincialism at the beginning of Cambrian Series 2 (similar to 521 Ma), suggesting a protracted but cryptic earlier history that possibly extends into the Precambrian. However, recent analyses indicate elevated rates of phenotypic and genomic evolution for arthropods during the early Cambrian, thereby shortening the phylogenetic fuse. Furthermore, comparatively little research has been devoted to understanding the duration of the Cambrian explosion, after which normal Phanerozoic evolutionary rates were established. We test these hypotheses by applying Bayesian tip-dating methods to a comprehensive dataset of Cambrian trilobites. We show that trilobites have a Cambrian origin, as supported by the trace fossil record and molecular clocks. Surprisingly, they exhibit constant evolutionary rates across the entire Cambrian, for all aspects of the preserved phenotype: discrete, meristic, and continuous morphological traits. Our data therefore provide robust, quantitative evidence that by the time the typical Cambrian fossil record begins (similar to 521 Ma), the Cambrian explosion had already largely concluded. This suggests that a modern-style marine biosphere had rapidly emerged during the latest Ediacaran and earliest Cambrian (similar to 20 million years), followed by broad-scale evolutionary stasis throughout the remainder of the Cambrian. |
英文关键词 | Cambrian explosion evolutionary rates trilobites Bayesian tip-dating morphological clock |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460242100070 |
WOS关键词 | FOSSIL RECORD ; RADIATION ; ANIMALS ; ORIGIN |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205064 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ New England, Sch Environm & Rural Sci, Palaeosci Res Ctr, Armidale, NSW 2351, Australia; 2.Nat Hist Museum, Dept Earth Sci, London SW7 5BD, England; 3.Flinders Univ S Australia, Coll Sci & Engn, Adelaide, SA 5001, Australia; 4.South Australian Museum, Earth Sci Sect, Adelaide, SA 5000, Australia |
推荐引用方式 GB/T 7714 | Paterson, John R.,Edgecombe, Gregory D.,Lee, Michael S. Y.. Trilobite evolutionary rates constrain the duration of the Cambrian explosion[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(10):4394-4399. |
APA | Paterson, John R.,Edgecombe, Gregory D.,&Lee, Michael S. Y..(2019).Trilobite evolutionary rates constrain the duration of the Cambrian explosion.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(10),4394-4399. |
MLA | Paterson, John R.,et al."Trilobite evolutionary rates constrain the duration of the Cambrian explosion".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.10(2019):4394-4399. |
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