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Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton

Author

Listed:
  • Nina Schuback
  • Christina Schallenberg
  • Carolyn Duckham
  • Maria T Maldonado
  • Philippe D Tortell

Abstract

Iron availability directly affects photosynthesis and limits phytoplankton growth over vast oceanic regions. For this reason, the availability of iron is a crucial variable to consider in the development of active chlorophyll a fluorescence based estimates of phytoplankton primary productivity. These bio-optical approaches require a conversion factor to derive ecologically-relevant rates of CO2-assimilation from estimates of electron transport in photosystem II. The required conversion factor varies significantly across phytoplankton taxa and environmental conditions, but little information is available on its response to iron limitation. In this study, we examine the role of iron limitation, and the interacting effects of iron and light availability, on the coupling of photosynthetic electron transport and CO2-assimilation in marine phytoplankton. Our results show that excess irradiance causes increased decoupling of carbon fixation and electron transport, particularly under iron limiting conditions. We observed that reaction center II specific rates of electron transport (ETRRCII, mol e- mol RCII-1 s-1) increased under iron limitation, and we propose a simple conceptual model for this observation. We also observed a strong correlation between the derived conversion factor and the expression of non-photochemical quenching. Utilizing a dataset from in situ phytoplankton assemblages across a coastal – oceanic transect in the Northeast subarctic Pacific, this relationship was used to predict ETRRCII: CO2-assimilation conversion factors and carbon-based primary productivity from FRRF data, without the need for any additional measurements.

Suggested Citation

  • Nina Schuback & Christina Schallenberg & Carolyn Duckham & Maria T Maldonado & Philippe D Tortell, 2015. "Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton," PLOS ONE, Public Library of Science, vol. 10(7), pages 1-30, July.
  • Handle: RePEc:plo:pone00:0133235
    DOI: 10.1371/journal.pone.0133235
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    References listed on IDEAS

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    1. Camille Napoléon & Virginie Raimbault & Pascal Claquin, 2013. "Influence of Nutrient Stress on the Relationships between PAM Measurements and Carbon Incorporation in Four Phytoplankton Species," PLOS ONE, Public Library of Science, vol. 8(6), pages 1-9, June.
    2. Robert F. Strzepek & Paul J. Harrison, 2004. "Photosynthetic architecture differs in coastal and oceanic diatoms," Nature, Nature, vol. 431(7009), pages 689-692, October.
    3. Camille Napoléon & Pascal Claquin, 2012. "Multi-Parametric Relationships between PAM Measurements and Carbon Incorporation, an In Situ Approach," PLOS ONE, Public Library of Science, vol. 7(7), pages 1-12, July.
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