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Updated: Dec 26, 2025

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Quantifying nutrient throughput and DOM production by algae in continuous culture.

A W Omta1, D Talmy2, K Inomura3

  • 1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States.

Journal of Theoretical Biology
|March 7, 2020
PubMed
Summary
This summary is machine-generated.

Algae regulate nutrients by releasing dissolved organic nitrogen and phosphorus. This rapid nutrient turnover, with atoms spending only 3 hours inside cells, explains algal stoichiometry under nutrient limitation.

Keywords:
Algal stoichiometryDOM productionPlankton modelPlankton physiology

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Area of Science:

  • * Aquatic microbiology and biogeochemistry.
  • * Physiological ecology of phytoplankton.

Background:

  • * Algae (phytoplankton) play a crucial role in aquatic ecosystems by regulating nutrient cycles.
  • * Understanding nutrient uptake, storage, and release mechanisms is key to predicting algal responses to environmental changes.
  • * Nitrogen (N) and phosphorus (P) are essential macronutrients often limiting algal growth.

Purpose of the Study:

  • * To investigate nutrient regulation processes in algae under nitrogen and phosphorus limitation.
  • * To quantify the turnover and release of non-limiting nutrients by the chlorophyte *Selenastrum minutum*.
  • * To model the production of algal biomass and dissolved organic matter (DOM) in relation to growth rate.

Main Methods:

  • * Reanalysis of published data from continuous cultures (chemostats) of *Selenastrum minutum*.
  • * Construction and fitting of a mathematical model describing biomass and DOM production.
  • * Mass budget analysis to assess nutrient partitioning and turnover.

Main Results:

  • * A significant portion of non-limiting N and P was found as dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP).
  • * A model fit indicated rapid turnover of N and P, with atoms spending an average of only 3 hours within cells at high growth rates.
  • * DOM exudation was identified as a mechanism explaining observed shifts in algal stoichiometric ratios with varying dilution rates.

Conclusions:

  • * Algae exhibit rapid internal turnover and exudation of non-limiting nutrients as DON and DOP.
  • * This DOM release is a key process influencing algal stoichiometry and nutrient cycling in aquatic environments.
  • * Further experimental work is recommended to quantify and characterize DON and DOP exudation.