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A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters
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Does microbial biomass affect pelagic ecosystem efficiency? An experimental study.

J D Wehr1, J Le, L Campbell

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This summary is machine-generated.

The microbial loop

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Area of Science:

  • Aquatic microbial ecology
  • Limnology
  • Biogeochemistry

Background:

  • Microorganisms in the pelagic zone are crucial for nutrient cycling.
  • The microbial loop is hypothesized to increase ecosystem efficiency by rapid nutrient recycling.
  • This process is thought to retain nutrients within the photic zone, reducing losses.

Purpose of the Study:

  • To investigate the impact of nutrient availability on microbial loop processes and nutrient loss.
  • To determine how different microbial components influence ecosystem efficiency and nutrient sedimentation.

Main Methods:

  • Experiments were conducted in 5400-liter lake mesocosms.
  • A factorial design manipulated phosphorus and nitrogen levels (8 treatments).
  • Fluxes of materials and nutrients, phytoplankton and bacterioplankton densities, and sedimentation rates were measured.

Main Results:

  • High nitrogen levels increased sedimentation rates.
  • Phosphorus additions in nitrogen-surplus conditions significantly increased particulate losses.
  • The ratio of autotrophic picoplankton to total phytoplankton strongly correlated with reduced sedimentation loss rates.
  • Higher planktonic bacteria densities were linked to increased sedimentation and lower system efficiency.

Conclusions:

  • Different microbial components can have contrasting effects on microbial loop efficiency.
  • Autotrophic picoplankton may enhance nutrient retention, while increased bacteria may increase nutrient loss.
  • Nutrient stoichiometry plays a critical role in regulating microbial loop function and ecosystem processes.