Exhumed hydrocarbon-seep authigenic carbonates from Zakynthos Island (Greece): Concretions not archaeological remains

Andrews, Julian E.; Stamatakis, Michael G.; Marca-Bell, A.; Stewart, Carlyn; Millar, Ian L.

doi:10.1016/j.marpetgeo.2016.05.022

Cited by 10 publications

(3 citation statements)

References 49 publications

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“…Several ecosystems naturally exposed to oil are known in western Greece; nonetheless, to our knowledge, this is the first report on the isolation of microorganisms from one such ecosystem. Soil samples from Keri Lake were characterized by the presence of oil and heavily decomposed plant material ( Palacas et al., 1986 ; Panagiotaras et al., 2012 ; Andrews et al., 2016 ; Avramidis et al., 2017 ). It is common for soil habitats, such as those with high phenolic content or those with increased biomass decay, to host microbes that have developed resistance and the ability to utilize the respective compounds.…”

Section: Discussionmentioning

confidence: 99%

Microbial bioprospecting for lignocellulose degradation at a unique Greek environment

Georgiadou¹,

Avramidis²,

Iοannou³

et al. 2021

Heliyon

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Bacterial systems have gained wide attention for depolymerization of lignocellulosic biomass, due to their high functional diversity and adaptability. To achieve the full microbial exploitation of lignocellulosic residues and the cost-effective production of bioproducts within a biorefinery, multiple metabolic pathways and enzymes of various specificities are required. In this work, highly diverse aerobic, mesophilic bacteria enriched from Keri Lake, a pristine marsh of increased biomass degradation and natural underground oil leaks, were explored for their metabolic versatility and enzymatic potential towards lignocellulosic substrates. A high number of Pseudomonas species, obtained from enrichment cultures where organosolv lignin served as the sole carbon and energy source, were able to assimilate a range of lignin-associated aromatic compounds. Comparatively more complex bacterial consortia, including members of Actinobacteria, Proteobacteria, Bacilli, Sphingobacteria, and Flavobacteria, were also enriched from cultures with xylan or carboxymethyl cellulose as sole carbon sources. Numerous individual isolates could target diverse structural lignocellulose polysaccharides by expressing hydrolytic activities on crystalline or amorphous cellulose and xylan. Specific isolates showed increased potential for growth in lignin hydrolysates prepared from alkali pretreated agricultural wastes. The results suggest that Keri isolates represent a pool of effective lignocellulose degraders with significant potential for industrial applications in a lignocellulose biorefinery.

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Section: Discussionmentioning

confidence: 99%

Microbial bioprospecting for lignocellulose degradation at a unique Greek environment

Georgiadou¹,

Avramidis²,

Iοannou³

et al. 2021

Heliyon

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“…On Earth, gigantic microbial-induced and stromatolite architectures can be detected from space (Suosaari et al 2016;Andrews et al 2016). With high-resolution multipixel imaging, analog features could be detected on nearby exoplanets.…”

Section: Methodsmentioning

confidence: 99%

Future Exoplanet Research: Science Questions and How to Address Them

Schneider

2018

Handbook of Exoplanets

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Started approximately in the late 1980s, exoplanetology has up to now unveiled the main gross bulk characteristics of planets and planetary systems. In the future it will benefit from more and more large telescopes and advanced space missions. These instruments will dramatically improve their performance in terms of photometric precision, detection speed, multipixel imaging, high-resolution spectroscopy, allowing to go much deeper in the knowledge of planets.Here we outline some science questions which should go beyond these standard improvements and how to address them. Our prejudice is that one is never too speculative: experience shows that the speculative predictions initially not accepted by the community have been confirmed several years later (like spectrophotometry of transits or circumbinary planets).

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“…Authigenic dolomite in methane seeps has rarely been studied, and an example from the naturally exhumed fossil seep in Greece showed depleted δ 13 C values as low (light, depleted) as −8.00 to −29.0‰, maybe indicative of dolomite formation at the AOM zone in the sediment [60]. Authigenic dolomite in drill-cores from the oil fields in the Santa Barbara Basin, off California, showed δ 13 C values of −16.0 to +9.00‰; lighter values are also indicative of dolomite formation in the relatively shallower zone of AOM with sulfate reduction, while heavier values may come from the relatively deeper zone of methanogenesis [61].…”

Section: Authigenic Dolomitesmentioning

confidence: 99%

Geo-Biological Coupling of Authigenic Carbonate Formation and Autotrophic Faunal Colonization at Deep-Sea Methane Seeps II. Geo-Biological Landscapes

Naganuma¹

2018

Marine Ecology - Biotic and Abiotic Interactions

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Deep-sea methane seeps are typically shaped with authigenic carbonates and unique biomes depending on methane-driven and methane-derived metabolisms. Authigenic carbonates vary in δ 13 C values due probably to δ 13 C variation in the carbon sources (directly carbon dioxide and bicarbonate, and ultimately methane) which is affected by the generation and degradation (oxidation) of methane at respective methane seeps. Anaerobic oxidation of methane (AOM) by specially developed microbial consortia has significant influences on the carbonate δ 13 C variation as well as the production of carbon dioxide and hydrogen sulfide for chemoautotrophic biomass production. Authigenesis of carbonates and faunal colonization are thus connected. Authigenic carbonates also vary in Mg contents that seem correlated again to faunal colonization. Among the colonizers, mussels tend to colonize low δ 13 C carbonates, while gutless tubeworms colonize high-Mg carbonates. The types and varieties of such geo-biological landscapes of methane seeps are overviewed in this chapter. A unique feature of a high-Mg content of the rocktubeworm conglomerates is also discussed.

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Exhumed hydrocarbon-seep authigenic carbonates from Zakynthos Island (Greece): Concretions not archaeological remains

Abstract: Exposure on the modern seabed in the shallow subtidal zone has caused confusion, as concretion morphology resembles archaeological stonework of the Hellenic period.

Cited by 10 publications

References 49 publications

Microbial bioprospecting for lignocellulose degradation at a unique Greek environment

Microbial bioprospecting for lignocellulose degradation at a unique Greek environment

Future Exoplanet Research: Science Questions and How to Address Them

Geo-Biological Coupling of Authigenic Carbonate Formation and Autotrophic Faunal Colonization at Deep-Sea Methane Seeps II. Geo-Biological Landscapes

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