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Related Experiment Video

Updated: May 6, 2026

Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids
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Carbon fluxes in the microbial loop: Comments.

B Velimirov1

  • 1Institut für Allgemeine Biologie, Abt. Mikrobiologie, Universität Wien, Währingerstr. 17/2, A-1090, Wien, Austria.

Microbial Ecology
|November 5, 2013
PubMed
Summary

Marine bacteria in oceanic aggregates show low carbon demand but high activity. This study suggests ultramicrobacteria (UMB) production may be underestimated, potentially explaining the discrepancy in bacterial production within these particles.

Area of Science:

  • Marine microbiology
  • Biogeochemical cycles

Background:

  • Oceanic aggregates harbor heterotrophic bacteria crucial for particle solubilization.
  • Observed bacterial features (low carbon demand, low turnover) conflict with high enzyme activity and cell counts.

Purpose of the Study:

  • To reconcile the discrepancy between bacterial traits and activity in oceanic aggregates.
  • To investigate the role of ultramicrobacteria (UMB) in bacterial production within aggregates.

Main Methods:

  • Analysis of bacterial community characteristics within oceanic aggregates.
  • Assessment of bacterial production, including potential underestimation by ultramicrobacteria (UMB).

Main Results:

  • Heterotrophic bacteria in oceanic aggregates exhibit low carbon demand and turnover rates.

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  • High enzyme activities and cell numbers suggest higher production than indicated by carbon demand.
  • Ultramicrobacteria (UMB) production may be a significant, previously underestimated component of total bacterial production, up to 28%.

    • Conclusions:

    • The apparent paradox in oceanic aggregate bacterial communities may be explained by the significant contribution of ultramicrobacteria (UMB).
    • Further research is needed to fully understand bacterial dynamics and their role in marine carbon cycling within aggregates.