Isotopic and microbial evidence for biodegradation of diluted bitumen in the unsaturated zone

Mindorff, Leah M.; Mahmoudi, Nagissa; Hepditch, Scott L J; Langlois, Valérie S.; Alam, Sabiha; Martel, Richard; Ahad, Jason M. E.

doi:10.1016/j.envpol.2023.121170

Cited by 7 publications

(3 citation statements)

References 56 publications

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“…Unraveling the relationships between the characteristics of DOM and its susceptibility to microbial utilization is complex and challenging to address. Natural abundance 14 C analysis is a robust tool for resolving the sources and ages of natural organic matter consumed and assimilated by microorganisms (Mahmoudi, Fulthorpe, et al., 2013; Mahmoudi, Porter, et al., 2013; Mailloux et al., 2013; Mindorff et al., 2023; Pearson et al., 2008; Petsch et al., 2001; Wakeham et al., 2006). This approach is grounded in the fact that heterotrophic microorganisms carry the same 14 C signatures as their carbon sources.…”

Section: Resultsmentioning

confidence: 99%

Picky Eaters: Carbon Isotopic Evidence for the Uniform Bioavailability of Riverine Dissolved Organic Matter to a Model Marine Microorganism

Baumser,

Potts,

Walker

et al. 2024

Geophysical Research Letters

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Dissolved organic matter (DOM) is a key component of the global carbon cycle, with rivers delivering significant amounts of DOM to oceans. Urbanization and agricultural land‐use alter the age and chemical composition of riverine DOM, which likely impact the downstream bioavailability of riverine DOM. Here, we use bioreactor incubations of a marine bacterium (Pseudoalteromonas sp. 3D05) to investigate DOM bioavailability from two distinct rivers: the Suwannee River (natural, non‐urbanized), and the Upper Mississippi River Basin (anthropogenically influenced). We measured rates of microbial CO2 production and radiocarbon ages (as Δ14C) to assess DOM remineralization. We observed nearly identical cell densities and degradation patterns for both riverine DOM incubations. Respired DOM Δ14C values were also similar and decreased over time indicative of preferential utilization of recently synthesized “modern” substrates. These findings reveal unexpected similarities in riverine DOM bioavailability, indicating similar short term biological reactivity despite large DOM compositional differences.

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Section: Resultsmentioning

confidence: 99%

Picky Eaters: Carbon Isotopic Evidence for the Uniform Bioavailability of Riverine Dissolved Organic Matter to a Model Marine Microorganism

Baumser,

Potts,

Walker

et al. 2024

Geophysical Research Letters

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“…Unraveling the relationships between the characteristics of DOM and its susceptibility to microbial utilization is complex and challenging to address. Natural abundance 14 C analysis is a robust tool for resolving the sources and ages of natural organic matter consumed and assimilated by microorganisms (Mahmoudi et al, 2013a(Mahmoudi et al, , 2013bMailloux et al, 2013;Mindorff et al, 2023;Pearson et al, 2008;Petsch et al, 2001;Wakeham et al, 2006). This approach is grounded in the fact that heterotrophic microorganisms carry the same 14 C signatures as their carbon sources.…”

Section: ∆ 14 C Signatures Of Microbially Respired Comentioning

confidence: 99%

Picky Eaters: Carbon isotopic evidence for the uniform bioavailability of riverine dissolved organic matter to a model marine microorganism

Baumser,

Potts,

Walker

et al. 2024

Preprint

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Dissolved organic matter (DOM) is a key component of the global carbon cycle, with rivers delivering significant amounts of DOM to oceans. Urbanization and agricultural land-use alter the age and chemical composition of riverine DOM, which likely impact the downstream bioavailability of riverine DOM. Here, we use bioreactor incubations of a marine bacterium (Pseudoalteromonas sp. 3D05) to investigate DOM bioavailability from two distinct rivers: the Suwannee River (natural, non-urbanized), and the Upper Mississippi River Basin (anthropogenically influenced). We measured rates of microbial CO2 production and radiocarbon ages (as Δ14C) to assess bioavailable DOM remineralization. We observed nearly identical cell densities and degradation patterns for both riverine DOM incubations. Respired DOM Δ14C values were also similar and decreased over time indicative of preferential utilization of recently synthesized “modern” substrates. These findings reveal unexpected similarities in riverine DOM bioavailability, indicating similar short term biological reactivity despite large DOM compositional differences.

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“…The ecological management of microbial systems for C sequestration may offer significant advantages in terms of lower implementation and maintenance costs. Environmental microbiology has long been concerned with developing effective long‐term, economically viable solutions to environmental challenges at scale, including the biodegradation of contaminants using native microbes (Hazen et al, 2016; Mahmoudi et al, 2013; Mindorff et al, 2023) as well as specialized degraders via bioaugmentation (Ferraro et al, 2021; Major et al, 2002; Weyens et al, 2009). By building upon this foundation, we can develop relevant principles to enhance the slow cycling of C at meaningful scale.…”

Section: Looking Forwardmentioning

confidence: 99%

Can we manage microbial systems to enhance carbon storage?

Mahmoudi

Wilhelm

2023

Environmental Microbiology

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Climate change is an urgent environmental issue with wide‐ranging impacts on ecosystems and society. Microbes are instrumental in maintaining the balance between carbon (C) accumulation and loss in the biosphere, actively regulating greenhouse gas fluxes from vast reservoirs of organic C stored in soils, sediments and oceans. Heterotrophic microbes exhibit varying capacities to access, degrade and metabolise organic C—leading to variations in remineralisation and turnover rates. The present challenge lies in effectively translating this accumulated knowledge into strategies that effectively steer the fate of organic C towards prolonged sequestration. In this article, we discuss three ecological scenarios that offer potential avenues for shaping C turnover rates in the environment. Specifically, we explore the promotion of slow‐cycling microbial byproducts, the facilitation of higher carbon use efficiency, and the influence of biotic interactions. The ability to harness and control these processes relies on the integration of ecological principles and management practices, combined with advances in economically viable technologies to effectively manage microbial systems in the environment.

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Isotopic and microbial evidence for biodegradation of diluted bitumen in the unsaturated zone

Cited by 7 publications

References 56 publications

Picky Eaters: Carbon Isotopic Evidence for the Uniform Bioavailability of Riverine Dissolved Organic Matter to a Model Marine Microorganism

Picky Eaters: Carbon Isotopic Evidence for the Uniform Bioavailability of Riverine Dissolved Organic Matter to a Model Marine Microorganism

Picky Eaters: Carbon isotopic evidence for the uniform bioavailability of riverine dissolved organic matter to a model marine microorganism

Can we manage microbial systems to enhance carbon storage?

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