Patterns in Microbialites Throughout Geologic Time: Is the Present Really the Key to the Past?

Myshrall, K. L.; Dupraz, Christophe; Visscher, Pieter T.

doi:10.1007/978-94-017-8721-5_6

Cited by 4 publications

(2 citation statements)

References 177 publications

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“…In mats and microbialites dominated by cyanobacteria these communities have adapted to these fluctuating CO 2 levels through the regulation of CO 2 -concentrating mechanisms, which are present in all cyanobacteria [54,55]. Microbialites often are the first post-mass extinction ecosystems observed in the fossil record [56]. The results of this study suggest that an increase to 1200 ppmv is not high enough to profoundly alter the community composition in the lithifying mats, however, additional manipulations are needed to assess whether higher CO 2 levels, such as those associated with past climate change, can significantly alter microbialite community structure [57].…”

Section: Changes In Microbial Diversity In Response To Elevated Co 2 mentioning

confidence: 99%

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

et al. 2014

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Atmospheric levels of carbon dioxide (CO 2 ) are rising at an accelerated rate resulting in changes in the pH and carbonate chemistry of the world's oceans. However, there is uncertainty regarding the impact these changing environmental conditions have on carbonate-depositing microbial communities. Here, we examine the effects of elevated CO 2 , three times that of current atmospheric levels, on the microbial diversity associated with lithifying microbial mats. Lithifying microbial mats are complex ecosystems that facilitate the trapping and binding of sediments, and/or the precipitation of calcium carbonate into organosedimentary structures known as microbialites. To examine the impact of rising CO 2 and resulting shifts in pH on lithifying microbial mats, we constructed growth chambers that could continually manipulate and monitor the mat environment. The microbial diversity of the various treatments was compared using 16S rRNA gene pyrosequencing. The results indicated that elevated CO 2 levels during the six month exposure did not profoundly alter the microbial diversity, community structure, or carbonate precipitation in the microbial mats; however some key taxa, such as the sulfate-reducing bacteria Deltasulfobacterales, were enriched. These results suggest that some carbonate depositing ecosystems, such as the microbialites, may be more resilient to anthropogenic-induced environmental change than previously thought. OPEN ACCESSMinerals 2014, 4 146

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Section: Changes In Microbial Diversity In Response To Elevated Co 2 mentioning

confidence: 99%

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

et al. 2014

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“…These benthic phototrophic microbial communities trap and bind detrital sediments and/or provide an appropriate locus for mineral precipitation [2]. Extant microbialites, resulting from the lithification of microbial mats, are presently forming in many locations around the Earth [3][4][5]. Benthic microbial mats [6] are characterized by a vast species diversity [7,8], yet their biogeochemical functioning can be described by a limited number of guilds [9,10].…”

Section: Introductionmentioning

confidence: 99%

Carbonate Precipitation in Mixed Cyanobacterial Biofilms Forming Freshwater Microbial Tufa

et al. 2019

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: Mixed cyanobacteria-dominated biofilms, enriched from a tributary of the Mérantaise (France) were used to conduct laboratory experiments in order to understand the relationship between the morphology of carbonate precipitates and the biological activity (e.g., cyanobacterial exopolymeric substances (EPS) production, photosynthetic pH increases). DNA sequencing data showed that the enriched biofilm was composed predominantly of two types of filamentous cyanobacteria that belonged to the Oscillatoriaceae and Phormidiaceae families, respectively. Microscopic analysis also indicated the presence of some coccoid cyanobacteria resembling Gloeocapsa. Analysis of carbonate precipitates in experimental biofilms showed three main morphologies: micro-peloids with different shapes of mesocrystals associated with Oscillatoriaceae filaments and theirs EPS, lamellae of carbonate formed directly on Phormidiaceae filaments, and rhombic sparite crystals wrapped in EPS. All crystals were identified by FT-IR spectroscopy as calcite. Similar structures as those that formed in laboratory conditions were observed in the microbial-tufa deposits collected in the stream. Microscopic and spectroscopic analysis of laboratory and natural samples indicated a close proximity of the cyanobacterial EPS and precipitated carbonates in both. Based on the laboratory experiments, we conclude that the microbial tufa in the stream is in an early stage of formation.

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Influence of dissolved oxygen on secular patterns of marine microbial carbonate abundance during the past 490 Myr

Riding

Liang²,

Lee

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

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Patterns in Microbialites Throughout Geologic Time: Is the Present Really the Key to the Past?

Cited by 4 publications

References 177 publications

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

Carbonate Precipitation in Mixed Cyanobacterial Biofilms Forming Freshwater Microbial Tufa

Influence of dissolved oxygen on secular patterns of marine microbial carbonate abundance during the past 490 Myr

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Patterns in Microbialites Throughout Geologic Time: Is the Present Really the Key to the Past?

Cited by 4 publications

References 177 publications

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

Effects of Elevated Carbon Dioxide and Salinity on the Microbial Diversity in Lithifying Microbial Mats

Carbonate Precipitation in Mixed Cyanobacterial Biofilms Forming Freshwater Microbial Tufa

Influence of dissolved oxygen on secular patterns of marine microbial carbonate abundance during the past 490 Myr

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Influence of dissolved oxygen on secular patterns of marine microbial carbonate abundance during the past 490 Myr