Sediment disturbance by Ediacaran bulldozers and the roots of the Cambrian explosion.
Sediment disturbance by Ediacaran bulldozers and the roots of the Cambrian explosion.
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DOI：
10.1038/s41598-018-22859-9
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发表时间：
2018-03-14
影响因子：
4.6
通讯作者：
Germs GJB
中科院分区：
文献类型：
--
作者：
Buatois LA;Almond J;Mángano MG;Jensen S;Germs GJB
沉积物推土机的遗迹化石记录于纳米比亚纳马群埃迪卡拉阶末地层，它们出现在乌鲁西斯组（Schwarzrand亚群）的Spitskop段。它们由单叶到双叶的水平到近水平的遗迹化石组成，描述了涂鸦，圆圈，更罕见的是开放的螺旋和蜿蜒，并显示了一个内部结构，表明了活跃的填充。它们的存在表明，相对较大的两侧对称动物对浅层地下动物群生态空间的开发在中生代的黎明就已经开始了。有效的穴居表明体腔的发展最有可能与后生动物身体大小的增加。这些痕迹化石是迄今为止记录的最早的明确代表沉积物推土作用的活动，这种活动可能对悬浮物喂养和/或营养群落以及床垫产生负面影响，代表了生态系统工程和营养群偏害的早期例子。沉积物推土机的出现可能促进了有机物质水平和垂直分布梯度的建立，这与地球演化的关键时期海底空间异质环境有关。
Trace fossils of sediment bulldozers are documented from terminal Ediacaran strata of the Nama Group in Namibia, where they occur in the Spitskop Member of the Urusis Formation (Schwarzrand Subgroup). They consist of unilobate to bilobate horizontal to subhorizontal trace fossils describing scribbles, circles and, more rarely, open spirals and meanders, and displaying an internal structure indicative of active fill. Their presence suggests that exploitation of the shallow infaunal ecospace by relatively large bilaterians was already well underway at the dawn of the Phanerozoic. Efficient burrowing suggests coelom development most likely linked to metazoan body-size increase. These trace fossils are the earliest clear representatives so far recorded of sediment bulldozing, an activity that may have had a negative impact on suspension-feeding and/or osmotroph communities, as well as on matgrounds, representing early examples of ecosystem engineering and trophic-group amensalism. The occurrence of sediment bulldozers may have promoted the establishment of gradients in horizontal and vertical distribution of organic material in connection with spatially heterogeneous environments on the sea floor at a critical time in Earth evolution.
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影响因子：
1.4
作者：
Carbone, Calla;Narbonne, Guy M.
通讯作者：
Narbonne, Guy M.
DOI：
10.1007/978-94-007-0680-4_5
发表时间：
2011-01-01
期刊：
QUANTIFYING THE EVOLUTION OF EARLY LIFE : NUMERICAL APPROACHES TO THE EVALUATION OF FOSSILS AND ANCIENT ECOSYSTEMS
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
Fedonkin, Mikhail A.
DOI：
10.1098/rspb.2015.1003
发表时间：
2015-09-07
影响因子：
4.7
作者：
Darroch, Simon A. F.;Sperling, Erik A.;Laflamme, Marc
通讯作者：
Laflamme, Marc
DOI：
10.1073/pnas.202322499
发表时间：
2002-10-01
影响因子：
11.1
作者：
Droser, ML;Jensen, S;Gehling, JG
通讯作者：
Gehling, JG