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Bacterial activity along a trophic gradient.

M Karner1, D Fuks, G J Herndl

  • 1Department of Marine Biology, Institute of Zoology, University of Vienna, A-1090, Vienna, Austria.

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Summary
This summary is machine-generated.

Bacterial activity, including secondary production and enzyme function, varied with seasons and trophic levels in the Adriatic Sea. Proteolytic activity strongly correlated with nutrient levels and bacterial production.

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Area of Science:

  • Marine microbial ecology
  • Bacteriology
  • Biogeochemistry

Background:

  • Bacterial biomass, secondary production, and extracellular enzymatic activity are key indicators of microbial processes in marine ecosystems.
  • Understanding these parameters along trophic gradients and across seasons is crucial for assessing ecosystem health and function.
  • The Northern Adriatic Sea presents a dynamic environment influenced by seasonal changes and nutrient inputs.

Purpose of the Study:

  • To investigate bacterial biomass, secondary production, and extracellular enzymatic activity (α-glucosidase and leucine-aminopeptidase) in the Northern Adriatic Sea.
  • To analyze how these bacterial parameters change along a trophic gradient and across different seasons.
  • To compare bacterial activity with chlorophyll a and nutrient concentrations to identify interrelationships.

Main Methods:

  • Measurements of bacterial biomass, secondary production, and extracellular enzymatic activity were conducted at 0.5 m depth.
  • Extracellular enzymes, α-glucosidase and leucine-aminopeptidase, were quantified using fluorogenic substrates (MVF and MCA).
  • Bacterial parameters were correlated with chlorophyll a, inorganic, and organic nutrient concentrations.

Main Results:

  • Bacterial secondary production and enzymatic activity fluctuated significantly with seasons and trophic gradients.
  • Leucine-aminopeptidase activity showed consistent increases during blooms and along trophic gradients, unlike α-glucosidase.
  • Significant positive correlations were found between bacterial proteolytic activity, secondary production, chlorophyll a, and nitrate concentrations.

Conclusions:

  • Bacterial secondary production and leucine-aminopeptidase activity are sensitive indicators of trophic status and seasonal dynamics in the Northern Adriatic Sea.
  • Proteolytic activity is closely linked to nutrient availability (nitrate) and overall bacterial productivity.
  • Bacterial community dynamics are strongly influenced by seasonal cycles and nutrient enrichment in this marine environment.