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Inorganic nutrients, bacteria, and the microbial loop.

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Planktonic bacteria actively consume dissolved inorganic nitrogen and phosphorus, shifting their role from nutrient recyclers to competitors with phytoplankton. This bacterial nutrient uptake highlights the crucial role of protozoa in nutrient remineralization within marine microbial loops.

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Area of Science:

  • Marine microbial ecology
  • Ocean biogeochemistry
  • Aquatic microbiology

Background:

  • Traditionally, planktonic bacteria were viewed primarily as remineralizers of nutrients in aquatic ecosystems.
  • Recent findings indicate that bacteria can actively acquire dissolved inorganic nutrients, altering this paradigm.
  • This bacterial nutrient uptake influences competition dynamics between bacteria and phytoplankton.

Purpose of the Study:

  • To re-evaluate the role of planktonic bacteria in nutrient cycling within marine communities.
  • To understand the implications of bacterial nutrient acquisition on microbial loop functioning.
  • To explore the conditions and locations where bacterial nutrient uptake is significant.

Main Methods:

  • Analysis of nutrient uptake rates in natural planktonic bacterial assemblages.
  • Investigating the competition for dissolved inorganic nitrogen and phosphorus between bacteria and phytoplankton.
  • Assessing the role of bacterivorous protozoa in nutrient remineralization.

Main Results:

  • Planktonic bacteria acquire a substantial portion of their nitrogen and phosphorus from dissolved inorganic pools.
  • Bacterial nutrient uptake positions bacteria as competitors with phytoplankton for growth-limiting nutrients.
  • Bacterivorous protozoa emerge as key players in remineralizing these nutrients within the microbial loop.

Conclusions:

  • The traditional view of bacteria solely as nutrient remineralizers is challenged by their active nutrient uptake.
  • Bacterial competition for inorganic nutrients with phytoplankton is a significant ecological interaction.
  • Understanding bacterial nutrient utilization is crucial for accurate modeling of marine biogeochemical cycles.