{"title":"Modern Rivularia Freshwater Stromatolites as Models for Formation of Laminated Stromatolitic Crusts","authors":"M. Hoppert, A. Reimer, K. Sauter, J. Reitner","doi":"10.1080/01490451.2023.2177363","DOIUrl":null,"url":null,"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.","PeriodicalId":12647,"journal":{"name":"Geomicrobiology Journal","volume":"40 1","pages":"382 - 398"},"PeriodicalIF":2.2000,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geomicrobiology Journal","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/01490451.2023.2177363","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
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.
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.
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