This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are creditedĭata Availability: All relevant data are within the paper and its Supporting Information files.įunding: This research was funded by grants to PDT and MTM from the National Sciences and Engineering Research Council of Canada, and from support from the UBC Peter Wall Institute for Advanced Studies to PDT. Received: FebruAccepted: JPublished: July 14, 2015Ĭopyright: © 2015 Schuback et al. Cockshutt, Mount Allison University, CANADA Utilizing a dataset from in situ phytoplankton assemblages across a coastal – oceanic transect in the Northeast subarctic Pacific, this relationship was used to predict ETR RCII: CO 2-assimilation conversion factors and carbon-based primary productivity from FRRF data, without the need for any additional measurements.Ĭitation: Schuback N, Schallenberg C, Duckham C, Maldonado MT, Tortell PD (2015) Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO 2-Assimilation in Marine Phytoplankton. We also observed a strong correlation between the derived conversion factor and the expression of non-photochemical quenching. We observed that reaction center II specific rates of electron transport (ETR RCII, mol e- mol RCII -1 s -1) increased under iron limitation, and we propose a simple conceptual model for this observation. Our results show that excess irradiance causes increased decoupling of carbon fixation and electron transport, particularly under iron limiting conditions. 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 CO 2-assimilation in marine phytoplankton. The required conversion factor varies significantly across phytoplankton taxa and environmental conditions, but little information is available on its response to iron limitation. These bio-optical approaches require a conversion factor to derive ecologically-relevant rates of CO 2-assimilation from estimates of electron transport in photosystem II. ![]() ![]() 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. Iron availability directly affects photosynthesis and limits phytoplankton growth over vast oceanic regions.
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