Phytoplankton growth and stoichiometry under multiple nutrient limitation

Christopher A. Klausmeier, Elena Litchman, Simon Asher Levin

Research output: Contribution to journalArticlepeer-review

206 Scopus citations

Abstract

Phytoplankton growth and stoichiometry depend on the availability of multiple nutrients. We use a mathematical model of phytoplankton with flexible stoichiometry to explain patterns of phytoplankton composition in chemostat experiments and nutrient drawdown dynamics that are found in the field. Exponential growth and equilibrium represent two distinct phases, each amenable to mathematical analysis. In a chemostat at a fixed dilution (growth) rate, phytoplankton stoichiometry matches the nutrient supply stoichiometry over a wide range at low growth rates and over a narrow range at high growth rates. In a chemostat with a fixed nutrient supply stoichiometry, phytoplankton stoichiometry varies with dilution rate nonlinearly, between the supply stoichiometry at low dilution rates and a species-specific optimal ratio at high dilution rates. The flexible-stoichiometry model we study predicts low equilibrium concentrations of two nutrients over a wide range of supply ratios, contrary to the predictions of a traditional fixed-stoichiometry model. The model is in quantitative agreement with experimental data, except at extreme nutrient supply ratios, which require a negative feedback from quota to uptake to fit the data. Our analysis points to the importance of better understanding the regulation of uptake rates in determining phytoplankton stoichiometry and incorporating this knowledge into phytoplankton models.

Original languageEnglish (US)
Pages (from-to)1463-1470
Number of pages8
JournalLimnology and Oceanography
Volume49
Issue number4 II
DOIs
StatePublished - Jul 2004

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Aquatic Science

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