Cyanobacteria in benthic microbial communities in coastal salt lakes in Western Australia

John, Jacob; Hay, Melissa; Paton, Jennifer

doi:10.1127/1864-1318/2009/0130-0125

Cited by 8 publications

(10 citation statements)

References 5 publications

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“…Note the additional high-Mg calcite spectral peaks in layers O and M, which according to semi-quantitative calculations with Pananalytical Highscore software contain 12-15 weight % high-Mg calcite, compared to layer S, which contains 3-5 weight % high-Mg calcite dominant primary producers within microbial mats and produce most EPS (Decho, Visscher, & Reid, 2005). While diatom frustules were observed in the modern mats in this study and in a previous study (John et al, 2009), no diatom fossils were observed in the microbialites.…”

Section: Modern Microbial Mat Community Compositionsupporting

confidence: 61%

“…Playford et al (1977) first described the external morphology of conical microbialites in perennial and monomictic lakes up to 8 m deep (Lake Serpentine and Government House Lake). The microbialites occur between autumn water depths of ~0.5 and 1.3 m, in association with a diatom‐rich and coccoid‐dominant microbial mat (Figure 2; John, Hay, & Paton, 2009). The lakes are ground water‐fed, and lake water chemistry varies seasonally according to changes in evaporation and precipitation (Table 1).…”

Section: Setting and Methodsmentioning

confidence: 99%

“…Although little work has been published on the Rottnest Island microbialites, John et al (2009) described the dominant cyanobacterial morphotypes and diatoms in the microbial mats using light microscopy, and found that pennate diatoms were abundant. Additionally, Monteiro, Vogwill, Bischoff, and Gleesonet al (2020) examined the genetic diversity within the microbial mat communities on Rottnest Island and found that bacteria comprised >97% of the metagenome.…”

mentioning

confidence: 99%

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Spherulitic microbialites from modern hypersaline lakes, Rottnest Island, Western Australia

et al. 2020

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Microbialites are organosedimentary deposits formed by the interaction of benthic microbial communities with their environment (Burne & Moore, 1987) and provide the only continuous macroscopic record for life spanning its appearance in the Archean through to the present day (Riding, 2000). Biological, physical, and chemical processes combine to produce an internal structure characteristic of microbialites, which include laminated fabrics and clotted to unlayered fabrics (Kennard & James, 1986).

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Section: Modern Microbial Mat Community Compositionsupporting

confidence: 61%

Section: Setting and Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Spherulitic microbialites from modern hypersaline lakes, Rottnest Island, Western Australia

et al. 2020

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“…Stromatolites and thrombolites that develop in other modern hypersaline systems sometimes show early fabric alteration and internal destruction as well (e.g., Lake Clifton, Lake Thetis, lakes on Rottnest Island, Australia (Moore & Burne, 1994;Reitner et al, 1996;John et al 2009); Lagoa Salgada, Brazil (Srivastava 1999)). Some of these systems share morphological similarities with stromatolitic knobs in Storr's Lake: Lagoa Salgada microbialites develop knobby buildups preserving a fine lamination (Srivastava 1999); the surface of thrombolites developing in Lake Clifton (Moore & Burne, 1994; fig.…”

Section: Comparison With Other Microbialitesmentioning

confidence: 99%

Stromatolitic knobs in Storr's Lake (San Salvador, Bahamas): a model system for formation and alteration of laminae

et al. 2013

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The initial lamination in young, metabolically active Scytonema knobs developing in Storr's Lake (Bahamas) results from the iterative succession of two different stages of microbial growth at the top of this microbialite. Stage 1 is dominated by vertically oriented cyanobacterial filaments and is characterized by a high porosity of the fabric. Stage 2 shows a higher microbial density with the filaments oriented horizontally and with higher carbonate content. The more developed, dense microbial community associated with Stage 2 of the Scytonema knobs rapidly degrades extracellular organic matter (EOM) and coupled to this, precipitates carbonate. The initial nucleation forms high-Mg calcite nanospheroids that progressively replace the EOM. No precipitation is observed within the thick sheath of the Scytonema filaments, possibly because of strong cross-linking of calcium and EOM (forming EOM-Ca-EOM complexes), which renders Ca unavailable for carbonate nucleation (inhibition process). Eventually, organominerals precipitate and form an initial lamina through physicochemical and microbial processes, including high rates of photosynthetic activity that lead to (13) C-enriched DIC available for initial nucleation. As this lamina moves downward by the iterative production of new laminae at the top of the microbialite, increased heterotrophic activity further alters the initial mineral product at depth. Although some rare relic preservation of 'Stage 1-Stage 2' laminae in subfossil knobs exists, the very fine primary lamination is considerably altered and almost completely lost when the knobs develop into larger and more complex morphologies due to the increased accommodation space and related physicochemical and/or biological alteration. Despite considerable differences in microstructure, the emerging ecological model of community succession leading to laminae formation described here for the Scytonema knobs can be applied to the formation of coarse-grained, open marine stromatolites. Therefore, both fine- and coarse-grained extant stromatolites can be used as model systems to understand the formation of microbialites in the fossil record.

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“…Nutrient concentrations as well as pH and salinity (which both varied little: 8.1 to 8.2 and 35 to 38, respectively) did not affect the microalgal mat type in the Bahamas (Bowlin et al ., ). This is in contrast to coastal lake systems where the benthic microalgae associated with microbialites are structured by both salinity and nutrient concentrations (John et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Environmental influences on living marine stromatolites: insights from benthic microalgal communities

Rishworth

Elden

Perissinotto

et al. 2015

Environmental Microbiology

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Extant marine stromatolites act as partial analogues of their Achaean counterparts, but are rare due to depleted ocean calcium carbonate levels and suppression by eukaryotic organisms. Unique, peritidal tufa stromatolites at the interface between marine and freshwater inputs were discovered in South Africa in the past decade. Our aim was to investigate the benthic microalgal community (green algae, diatoms and cyanobacteria) of these stromatolites to assess succession and dominance patterns using real-time, in situ measurements of algal concentrations and composition. These biological measurements were modelled using generalized linear modelling (GLM) multivariate statistics against water physical and chemical parameters measured at regular monthly intervals, from January to December 2014. Salinity peaked and temperature dipped in winter, with both correlated to microalgal community change (GLM: P < 0.01). Diatoms and cyanobacteria, which construct the stromatolites, were consistently the dominant groups within the algal community, with minimal green algae present throughout the year. Importantly, this demonstrates a unique, relatively stable microalgal stromatolite community as opposed to those of other marine stromatolites, which likely require seasonal and stochastic disturbance to persist. This has implications in terms of interpreting community succession and differential layering in modern and fossilized stromatolites respectively.

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Cyanobacteria in benthic microbial communities in coastal salt lakes in Western Australia

Cited by 8 publications

References 5 publications

Spherulitic microbialites from modern hypersaline lakes, Rottnest Island, Western Australia

Spherulitic microbialites from modern hypersaline lakes, Rottnest Island, Western Australia

Stromatolitic knobs in Storr's Lake (San Salvador, Bahamas): a model system for formation and alteration of laminae

Environmental influences on living marine stromatolites: insights from benthic microalgal communities

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