Utilization of low-molecular-weight organic compounds by the filterable fraction of a lotic microbiome.
14C-radioisotope tracking
16S rRNA amplicon sequencing
dissolved organic matter (DOM)
filterable microorganisms
freshwater
metabolomics
microbial ecology
shotgun sequencing
Journal
FEMS microbiology ecology
ISSN: 1574-6941
Titre abrégé: FEMS Microbiol Ecol
Pays: England
ID NLM: 8901229
Informations de publication
Date de publication:
05 02 2021
05 02 2021
Historique:
received:
09
06
2020
accepted:
30
11
2020
pubmed:
3
12
2020
medline:
21
4
2021
entrez:
2
12
2020
Statut:
ppublish
Résumé
Filterable microorganisms participate in dissolved organic carbon (DOC) cycling in freshwater systems, however their exact functional role remains unknown. We determined the taxonomic identity and community dynamics of prokaryotic microbiomes in the 0.22 µm-filtered fraction and unfiltered freshwater from the Conwy River (North Wales, UK) in microcosms and, using targeted metabolomics and 14C-labelling, examined their role in the utilization of amino acids, organic acids and sugars spiked at environmentally-relevant (nanomolar) concentrations. To identify changes in community structure, we used 16S rRNA amplicon and shotgun sequencing. Unlike the unfiltered water samples where the consumption of DOC was rapid, the filtered fraction showed a 3-day lag phase before the consumption started. Analysis of functional categories of clusters of orthologous groups of proteins (COGs) showed that COGs associated with energy production increased in number in both fractions with substrate addition. The filtered fraction utilized low-molecular-weight (LMW) DOC at much slower rates than the whole community. Addition of nanomolar concentrations of LMW DOC did not measurably influence the composition of the microbial community nor the rate of consumption across all substrate types in either fraction. We conclude that due to their low activity, filterable microorganisms play a minor role in LMW DOC processing within a short residence time of lotic freshwater systems.
Identifiants
pubmed: 33264383
pii: 6017305
doi: 10.1093/femsec/fiaa244
pmc: PMC7864478
pii:
doi:
Substances chimiques
Organic Chemicals
0
RNA, Ribosomal, 16S
0
Carbon
7440-44-0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Informations de copyright
© The Author(s) 2020. Published by Oxford University Press on behalf of FEMS.
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