Modern Rivularia Freshwater Stromatolites as Models for Formation of Laminated Stromatolitic Crusts

IF 2.2 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Geomicrobiology Journal Pub Date : 2023-02-27 DOI:10.1080/01490451.2023.2177363

M. Hoppert, A. Reimer, K. Sauter, J. Reitner

引用次数: 0

Abstract

Abstract In the present study, microbialites from a stream in the Ammergau Alps (Northern Calcareous Alps) were examined with regard to morphology, mineralogy, and colonizing microorganisms. The carbonate buildups form regular (mainly laminated) stromatolite structures, essentially due to the activity of the cyanobacterium Rivularia. The filaments of the cyanobacterium form exopolymer sheaths that prevent the precipitation of calcite from the carbonate-supersaturated stream water at cell surfaces. A pattern of non-calcified, parallel tubes surrounded by a calcified scaffold is built up. The calcification pattern may be explained by the inhibitory activity of cyanobacterial sheath exopolymers. In lower layers of the carbonate buildup, microbial diversity increases due to colonization by mainly heterotrophic bacteria. The hollow tubes hitherto exempt from calcification are gradually being filled. Calcification pattern is discussed in view of fossil Girvanella-type stromatolites.

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现代Rivularia淡水叠层石作为层状叠层石地壳形成的模型

摘要在本研究中，对来自Ammergau阿尔卑斯山（北钙质阿尔卑斯山）溪流的微生物进行了形态、矿物学和定殖微生物的检查。碳酸盐堆积形成规则的（主要是层状的）叠层石结构，主要是由于Rivularia蓝细菌的活性。蓝细菌的细丝形成外聚合物鞘，阻止方解石从细胞表面的碳酸盐过饱和流水中沉淀。形成了一个由钙化支架包围的非钙化平行管的图案。钙化模式可以用蓝藻鞘外聚合物的抑制活性来解释。在碳酸盐堆积的下层，由于主要由异养细菌定殖，微生物多样性增加。迄今为止没有钙化的空心管正在逐渐填充。从Girvanella型叠层石化石的角度讨论了钙化模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomicrobiology Journal 环境科学-地球科学综合

CiteScore

4.80

自引率

8.70%

发文量

审稿时长

3.3 months

期刊介绍： Geomicrobiology Journal is a unified vehicle for research and review articles in geomicrobiology and microbial biogeochemistry. One or two special issues devoted to specific geomicrobiological topics are published each year. General articles deal with microbial transformations of geologically important minerals and elements, including those that occur in marine and freshwater environments, soils, mineral deposits and rock formations, and the environmental biogeochemical impact of these transformations. In this context, the functions of Bacteria and Archaea, yeasts, filamentous fungi, micro-algae, protists, and their viruses as geochemical agents are examined. Articles may stress the nature of specific geologically important microorganisms and their activities, or the environmental and geological consequences of geomicrobiological activity. The Journal covers an array of topics such as: microbial weathering; microbial roles in the formation and degradation of specific minerals; mineralization of organic matter; petroleum microbiology; subsurface microbiology; biofilm form and function, and other interfacial phenomena of geological importance; biogeochemical cycling of elements; isotopic fractionation; paleomicrobiology. Applied topics such as bioleaching microbiology, geomicrobiological prospecting, and groundwater pollution microbiology are addressed. New methods and techniques applied in geomicrobiological studies are also considered.