气候变化领域集成服务门户(CCPortal): Early Archean planktonic mode of life: Implications from fluid dynamics of lenticular microfossils

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DOI	10.1111/gbi.12319
	Early Archean planktonic mode of life: Implications from fluid dynamics of lenticular microfossils
	Kozawa T.; Sugitani K.; Oehler D.Z.; House C.H.; Saito I.; Watanabe T.; Gotoh T.
发表日期	2019
ISSN	14724677
起始页码	113
结束页码	126
卷号	17 期号:2
英文摘要	Lenticular, and commonly flanged, microfossils in 3.0–3.4 Ga sedimentary deposits in Western Australia and South Africa are unusually large (20–80 μm across), robust, and widespread in space and time. To gain insight into the ecology of these organisms, we performed simulations of fluid dynamics of virtual cells mimicking lenticular forms of variable sizes, oblateness, flange presence, and flange thickness. Results demonstrate that (a) the flange reduces sedimentation velocity, (b) this flange function works more effectively in larger cells, and (c) modest oblateness lowers sedimentation rate. These observations support interpretations that the lenticular microbes were planktonic—a lifestyle that could have been advantageous in an early Earth harsh environment including violent volcanic activities, repeated asteroid impacts, and relatively high UV-radiation. Although the robustness of these organisms could have provided additional protection on the early Earth, this architecture may have impeded a planktonic lifestyle by increasing cell density. However, our data suggest that this disadvantage could have been compensated by enlargement of cell volume, which could have enhanced the ability of the flange to slow sedimentation rate, especially if coupled with vacuolation. The results of this simulation study may help to explain the unique morphology and unusually large size of these Archean microfossils. © 2018 John Wiley & Sons Ltd
关键词	Archean early Earth fluid dynamics lifestyle microfossil microorganism plankton sedimentation rate simulation Australia South Africa Western Australia aquatic species astronomy fossil hydrodynamics life history trait physiology plankton sediment South Africa Western Australia Aquatic Organisms Earth (Planet)Fossils Geologic Sediments Hydrodynamics Life History Traits Plankton South Africa Western Australia
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133243
推荐引用方式 GB/T 7714	Kozawa T.,Sugitani K.,Oehler D.Z.,et al. Early Archean planktonic mode of life: Implications from fluid dynamics of lenticular microfossils[J]. Geobiology,2019,17(2).
APA	Kozawa T..,Sugitani K..,Oehler D.Z..,House C.H..,Saito I..,...&Gotoh T..(2019).Early Archean planktonic mode of life: Implications from fluid dynamics of lenticular microfossils.,17(2).
MLA	Kozawa T.,et al."Early Archean planktonic mode of life: Implications from fluid dynamics of lenticular microfossils".17.2(2019).