Cobalamin and microbial plankton dynamics along a coastal to offshore transect in the Eastern North Atlantic Ocean.
Journal
Environmental microbiology
ISSN: 1462-2920
Titre abrégé: Environ Microbiol
Pays: England
ID NLM: 100883692
Informations de publication
Date de publication:
03 2021
03 2021
Historique:
revised:
17
12
2020
received:
17
03
2020
accepted:
17
12
2020
pubmed:
22
12
2020
medline:
16
10
2021
entrez:
21
12
2020
Statut:
ppublish
Résumé
Cobalamin (B12) is an essential cofactor that is exclusively synthesized by some prokaryotes while many prokaryotes and eukaryotes require an external supply of B12. The spatial and temporal availability of B12 is poorly understood in marine ecosystems. Field measurements of B12 along with a large set of ancillary biotic and abiotic factors were obtained during three oceanographic cruises in the NW Iberian Peninsula, covering different spatial and temporal scales. B12 concentrations were remarkably low (<1.5 pM) in all samples, being significantly higher at the subsurface Eastern North Atlantic Central Water than at shallower depths, suggesting that B12 supply in this water mass is greater than demand. Multiple regression models excluded B12 concentration as predictive variable for phytoplankton biomass or production, regardless of the presence of B12-requiring algae. Prokaryote production was the best predictor for primary production, and eukaryote community composition was better correlated with prokaryote community composition than with nutritional resources, suggesting that biotic interactions play a significant role in regulating microbial communities. Interestingly, co-occurrence network analyses based on 16S and 18S rRNA sequences allowed the identification of significant associations between potential B12 producers and consumers (e.g. Thaumarchaeota and Dynophyceae, or Amylibacter and Ostreococcus respectively), which can now be investigated using model systems in the laboratory.
Identifiants
pubmed: 33346385
doi: 10.1111/1462-2920.15367
doi:
Substances chimiques
Vitamin B 12
P6YC3EG204
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1559-1583Informations de copyright
© 2020 Society for Applied Microbiology and John Wiley & Sons Ltd.
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