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Bacterial activity at the air/water interface.

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Bacterial activity in surface microlayers and bulk water showed no significant differences. However, bacteria with high surface accumulation exhibited low exchange between these environments, highlighting unique interface habitats.

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Area of Science:

  • Environmental microbiology
  • Aquatic microbial ecology
  • Interface science

Background:

  • The surface microlayer (SM) is a unique aquatic habitat with distinct microbial communities.
  • Understanding bacterial activity and distribution between the SM and bulk water is crucial for aquatic ecosystem studies.

Purpose of the Study:

  • To quantify bacterial activity and respiration rates in the SM and bulk water.
  • To investigate the exchange dynamics of bacteria between the SM and bulk water.
  • To determine the influence of substrate concentration and type on bacterial activity at the air-water interface.

Main Methods:

  • Utilized a combined microautoradiography-epifluorescence (ME) method to determine the fraction of active bacterial cells.
  • Measured (14)CO2 evolution to assess bacterial respiration rates.
  • Employed radiolabeled substrates ((3)H-palmitic acid and (14)C-protein) to track bacterial distribution and activity.

Main Results:

  • No significant difference was observed in the fraction of active cells between the SM and bulk water.
  • Bacteria with high surface accumulation showed limited exchange between the SM and bulk water.
  • Respiration rates varied with substrate concentration and location (SM vs. bulk), with interface-localized protein showing lower activity at low concentrations.

Conclusions:

  • Bacterial activity is comparable in the SM and bulk water, likely due to cell exchange.
  • Bacterial behavior at interfaces is influenced by substrate availability and their specific surface-accumulating properties.
  • Aquatic interfaces represent distinct habitats influencing microbial processes.