Speciation of Paleoarchean Life Demonstrated by Analysis of the Morphological Variation of Lenticular Microfossils from the Pilbara Craton, Australia.
Speciation of Paleoarchean Life Demonstrated by Analysis of the Morphological Variation of Lenticular Microfossils from the Pilbara Craton, Australia.
复制标题
通过分析澳大利亚皮尔巴拉克拉通透镜状微化石的形态变化证明古太古代生命的形态。
DOI：
10.1089/ast.2017.1799
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发表时间：
2018
期刊：
影响因子：
4.2
通讯作者：
Hiroshi Morimoto
中科院分区：
文献类型：
--
作者：
K. Sugitani;Takashi Kohama;K. Mimura;M. Takeuchi;R. Senda;Hiroshi Morimoto
澳大利亚皮尔巴拉盆地约3.4 Ga的Strelley池组（SPF）代表了古太古代沉积序列，保存了描述良好的形态多样的生物特征，如叠层石和细胞保存的微体化石。SPF微体化石组合来自三个绿岩带，包括相对较大的（20-80 μm宽）、耐酸、有机壁的透镜状微体化石，可利用孢粉学技术提取。在这项研究中，我们提出的测量结果超过800个孢粉形态标本的SPF透镜状微体化石从2个偏远（相隔约80公里）的地方，代表不同的沉积环境，从而不同的栖息地，证明了其独特的岩石地层组合和微量元素地球化学。我们从统计学上证明了这两个种群的扁率是不同的，而且每个种群都包括由不同面积和扁率定义的亚种群。这项研究可能为单细胞生物的物种形成提供了最早的形态学证据，这可能是异地（地理）和适应性的。也可以表明，SPF透镜状微生物具有高度组织化的细胞骨架，这对于严格控制大型和健壮微生物的细胞形态是必不可少的，这反过来可能有利于它们的繁荣和多样化。
The ca 3.4 Ga Strelley Pool Formation (SPF) of the Pilbara Craton, Australia, represents a Paleoarchean sedimentary succession preserving well-described and morphologically diverse biosignatures such as stromatolites and cellularly preserved microfossils. The SPF microfossil assemblage identified from three greenstone belts includes relatively large (20-80 μm in width), acid-resistant, organic-walled lenticular microfossils, which can be extracted using a palynological technique. In this study, we present results of measurements of over 800 palynomorphic specimens of SPF lenticular microfossils from 2 remote (∼80 km apart) localities that represent different depositional environments and thus different habitats, as evidenced by their distinct lithostratigraphic association and trace element geochemistry. We demonstrate statistically that the two populations are distinct in oblateness from a polar view and furthermore that each population comprises subpopulations defined by different areas and oblateness. This study may provide the earliest morphological evidence for speciation of unicellular organisms, which could have been allopatric (geographic) and adaptive. It can also be suggested that SPF lenticular microbes had highly organized cytoskeleton indispensable for strict control of the cell morphology of large and robust microbes, which in turn were likely advantageous to their prosperity and diversification.
DOI：
10.1073/pnas.1718063115
发表时间：
2018-01-02
影响因子：
11.1
作者：
Schopf, J. William;Kitajima, Kouki;Valley, John W.
通讯作者：
Valley, John W.
影响因子：
5.4
作者：
K. Young
通讯作者：
K. Young
DOI：
10.1073/pnas.0602047103
发表时间：
2006-08-01
影响因子：
11.1
作者：
Wagner, Jennifer K.;Setayeshgar, Sima;Brun, Yves V.
通讯作者：
Brun, Yves V.