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Updated: Sep 17, 2025

Author Spotlight: Understanding Riverine Nitrogen Impacts and Primary Productivity for Effective Nutrient Management
Published on: July 14, 2023
Nitrogen and phosphorus differentially control marine biomass production and stoichiometry
Emily A Seelen1,2, Samantha J Gleich3, William Kumler4
1University of Southern California, Department of Earth Science, Los Angeles, CA, USA. eseelen@alaska.edu.
None:
Globally averaged, surface particulate nitrogen and phosphorus approximate the 16:1, N:P "Redfield ratio." In observations, N:P ratios vary latitudinally at ranges attributable to both phytoplankton community composition and physiological acclimation, but their relative contributions to the N:P ratio remain unclear. Here, results from a 29-day mesocosm experiment highlight how inorganic nitrogen and/or phosphorus nutrient supply can affect the bulk particle stoichiometry of a North Pacific Subtropical Gyre plankton community. Nitrogen additions, with and without phosphorus, increase total productivity and diatom abundance, whereas treatments with just phosphorus additions remain similar to the no-nutrient addition control. Continual nitrogen supply without phosphorus results in higher particulate N:P ratios than expected based on the phytoplankton community present. Several P-stress markers identified in those treatments highlight the importance of acclimation in extending particulate N:P ratios beyond the Redfield ratio. Phytoplankton's ability to maintain growth under P-stress conditions has implications for global carbon cycling.
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