Latitudinal variation in plankton traits and ecosystem function

Subhendu Chakraborty*, Mathilde Cadier, André W. Visser, Jorn Bruggeman, Ken H. Andersen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Planktonic ecosystems are usually modelled in terms of autotrophic and heterotrophic compartments. However, the trophic strategy of unicellular organisms can take a range of mixotrophic strategies with both autotrophic and heterotrophic contributions. The dominant emerging strategy found in nature depends on the environment (both biotic and abiotic aspects) and the cell size, and influences key ecosystem functions like trophic transfer and carbon export. Ecosystem models that faithfully represent this diversity of trophic strategies are lacking. Here we develop a trait-based model of unicellular plankton with cell size as the master trait and three other traits that determine trophic strategies: investments in photosynthesis, nutrient uptake, and phagotrophy. This unicellular model spans the entire auto- mixo- hererotrophic strategy continuum and the entire size range of unicellular organisms. The model reproduces observed latitudinal patterns in biomass, primary productivity, vertical carbon export, and energy transfer efficiency; all increase with increasing latitude. The size range of mixotrophic cells is independent of the season at low latitudes. At high latitudes, the dominance of pure phototrophs during early spring restricts mixotrophic behavior to a narrower range of cell sizes and with the occurrence of relatively smaller mixotrophs during summer. The model’s ability to adapt to different environmental conditions, combined with its simple conceptual structure and low number of parameters and state variables (10), makes it ideally suited for global simulation studies under changing environmental conditions.
Original languageEnglish
Article numbere2020GB006564
JournalGlobal Biogeochemical Cycles
Volume34
Issue number8
Number of pages25
ISSN0886-6236
DOIs
Publication statusPublished - 2020

Keywords

  • Plankton
  • Trait-based modelling
  • Trophic strategy
  • Ecosystem function
  • Latitudinal variation
  • Optimization

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