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<p>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.</p>

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Nitrogen and phosphorus differentially control marine biomass production and stoichiometry

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Emily A. Seelen,
  • Samantha J. Gleich,
  • William Kumler,
  • Hanna S. Anderson,
  • Xiaopeng Bian,
  • Karin M. Björkman,
  • David A. Caron,
  • Sonya T. Dyhrman,
  • Sara Ferrón,
  • Zoe V. Finkel,
  • Sheean T. Haley,
  • Ying-Yu Hu,
  • Anitra E. Ingalls,
  • Andrew J. Irwin,
  • David M. Karl,
  • Kyeong Pil Kong,
  • Daniel P. Lowenstein,
  • Andrés E. Salazar Estrada,
  • Emily Townsend,
  • John C. Tracey,
  • Kendra Turk-Kubo,
  • Benjamin A. S. Van Mooy,
  • Seth G. John

摘要

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.