Microbial Cycling of Organic Compounds in Aquatic Environments

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Environmental Microbiology".

Deadline for manuscript submissions: closed (31 July 2022) | Viewed by 3426

Special Issue Editors


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Guest Editor
Plymouth Marine Laboratory, Plymouth, UK
Interests: biogeochemistry of volatile organic compounds (methanol, acetaldehyde, acetone, isoprene, DMS); controls on primary and bacterial productivity; C, N, P and S cycling in seawater

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Co-Guest Editor
Centre for Research in Biosciences, University of the West of England, UWE Bristol, UK
Interests: marine microbial ecology; aquatic nutrient cycling

Special Issue Information

Dear Colleagues,

Dissolved organic compounds in aquatic systems represent one of Earth’s largest exchangeable reservoirs of carbon. This pool also contains a range of dissolved organic nutrients containing N, P and S compounds, which often can be quickly utilised by microbes. The sources, sinks and controls of these dissolved organic compounds remain, more often than not, poorly understood in aquatic environments. A subsection of the dissolved organic pool is often referred to as biogenic volatile organic compounds (BVOCs), which are those thought to be produced via biological mechanisms, often from phytoplankton in aquatic systems, e.g., DMS, isoprene, methanol, acetaldehyde. Some of these BVOCs (and others like acetone) are also oxygenated and referred to as oxygenated volatile organic compounds (OVOCs). Typically, methanol, acetaldehyde and acetone are considered the dominant ubiquitous species that comprise the total OVOC pool. These volatile species have high vapor pressures that facilitate transfer into the atmosphere where they are considered climate active. Hence it is critical to understand the controls on the production and consumption of these dissolved organic compounds in aquatic environments. The Special Issue will focus on the biological control and cycling of a range of dissolved organic compounds in freshwater, estuarine and marine environments.

Dr. Joanna L. Dixon
Guest Editor
Dr. Stephanie Sargeant
Co-Guest Editor

Manuscript Submission Information

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Keywords

  • dissolved organic carbon compounds
  • microbial uptake
  • carbon cycling
  • sulfur cycling
  • nitrogen cycling
  • microbial assimilation
  • microbial dissimilation
  • aquatic environments (freshwater, estuarine and marine)

Published Papers (1 paper)

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Research

18 pages, 1967 KiB  
Article
Laboratory In-Situ Production of Autochthonous and Allochthonous Fluorescent Organic Matter by Freshwater Bacteria
by Bethany G. Fox, Robin M. S. Thorn and Darren M. Reynolds
Microorganisms 2021, 9(8), 1623; https://0-doi-org.brum.beds.ac.uk/10.3390/microorganisms9081623 - 29 Jul 2021
Cited by 3 | Viewed by 2288
Abstract
This work investigates the origin and range of fluorescent organic matter (FOM) produced in-situ by environmentally sourced freshwater bacteria. Aquatic FOM is an essential component in global carbon cycling and is generally classified as either autochthonous, produced in-situ via microbial processes, or allochthonous, [...] Read more.
This work investigates the origin and range of fluorescent organic matter (FOM) produced in-situ by environmentally sourced freshwater bacteria. Aquatic FOM is an essential component in global carbon cycling and is generally classified as either autochthonous, produced in-situ via microbial processes, or allochthonous, transported into aquatic systems from external sources. We have demonstrated that, within laboratory model systems, environmentally sourced mixed microbial communities and bacterial isolates can produce and/or export FOM associated with both autochthonous and allochthonous material. This study focuses on fluorescence peak B, T, M, C and C+, exploring (1) the cellular nature of FOM produced, (2) FOM exported as extracellular material into the water column and (3) the impact of physical cell lysis on FOM signature. For the laboratory model systems studied, Peak T fluorescence is retained within bacterial cells (>68%), while Peak C fluorescence is mainly observed as extracellular material (>80%). Peak M is identified as both cellular and extracellular FOM, produced by all isolated freshwater microorganisms investigated. The origin of Peak C+ is postulated to originate from functional metabolites associated with specific microorganisms, seen specifically within the Pseudomonas sp. monoculture here. This work challenges the binary classification of FOM as either allochthonous or autochthonous, suggesting that FOM processing and production occurs along a dynamic continuum. Within this study, fluorescence intensity data for the environmental bacteria isolate monocultures are presented as enumeration corrected data, for the first time providing quantitative fluorescence data per bacterial colony forming unit (cfu). From this, we are able to assess the relative contribution of different bacteria to the autochthonous FOM pool and if this material is cellular or extracellular. Full article
(This article belongs to the Special Issue Microbial Cycling of Organic Compounds in Aquatic Environments)
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