Discriminating signal from noise in the fossil record of early vertebrates reveals cryptic evolutionary history.
Discriminating signal from noise in the fossil record of early vertebrates reveals cryptic evolutionary history.
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DOI：
10.1098/rspb.2014.2245
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发表时间：
2015-02-07
期刊：
影响因子：
--
通讯作者：
Donoghue PC
中科院分区：
文献类型：
--
作者：
Sansom RS;Randle E;Donoghue PC
早期脊椎动物的化石记录在阐明有颚类动物体型的进化组合方面具有影响力。然而，对脊椎动物创新的时间和克里思的理解仍然陷入了对化石记录的字面阅读。早期无颌脊椎动物（介形类）表现出对浅水环境的限制。因此，它们的地层产状的分布不仅反映了多样性的变化，而且反映了岩石记录的相代表性的长期变化。利用地层学、系统发育学和古环境资料，我们评估了有颌脊椎动物（骨介类、盔虫类、Thelodonti、异层类）的无颌亲属化石记录的准确性。利用古生代海平面变化的化石恢复潜力的非随机模型被用来计算分支起源的置信区间。这些时间间隔延长了可能的起源到上奥陶世的时间尺度;这些估计改善了推断为Osteostraci，Galeaspida和Heterostraci的长幽灵谱系，考虑到它们已知的地层发生和茎颚口类的发育。通过志留纪和泥盆纪的多样性变化被认为是在预期的范围内预测的化石记录质量的估计表明，它是地质，而不是生物因素，是负责多样性的变化。环境限制似乎也掩盖了介形类动物的灭绝和死亡，而不是与有颌脊椎动物的竞争。
The fossil record of early vertebrates has been influential in elucidating the evolutionary assembly of the gnathostome bodyplan. Understanding of the timing and tempo of vertebrate innovations remains, however, mired in a literal reading of the fossil record. Early jawless vertebrates (ostracoderms) exhibit restriction to shallow-water environments. The distribution of their stratigraphic occurrences therefore reflects not only flux in diversity, but also secular variation in facies representation of the rock record. Using stratigraphic, phylogenetic and palaeoenvironmental data, we assessed the veracity of the fossil records of the jawless relatives of jawed vertebrates (Osteostraci, Galeaspida, Thelodonti, Heterostraci). Non-random models of fossil recovery potential using Palaeozoic sea-level changes were used to calculate confidence intervals of clade origins. These intervals extend the timescale for possible origins into the Upper Ordovician; these estimates ameliorate the long ghost lineages inferred for Osteostraci, Galeaspida and Heterostraci, given their known stratigraphic occurrences and stem–gnathostome phylogeny. Diversity changes through the Silurian and Devonian were found to lie within the expected limits predicted from estimates of fossil record quality indicating that it is geological, rather than biological factors, that are responsible for shifts in diversity. Environmental restriction also appears to belie ostracoderm extinction and demise rather than competition with jawed vertebrates.
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DOI：
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发表时间：
2009-07-22
影响因子：
4.7
作者：
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影响因子：
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2003-06-05
影响因子：
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DOI：
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发表时间：
1985-01-01
期刊：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
影响因子：
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作者：
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通讯作者：
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DOI：
10.1144/sp358.13
发表时间：
2011-01-01
期刊：
COMPARING THE GEOLOGICAL AND FOSSIL RECORDS: IMPLICATIONS FOR BIODIVERSITY STUDIES
影响因子：
--
作者：
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通讯作者：
Butler, Richard J.