JPR Advance Access published online on January 19, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm012
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Extraction of Photosynthesis-Irradiance Parameters from Phytoplankton Production Data: Demonstration in Various Aquatic Systems
1 Department of Biology, Dalhousie University, 1355 Oxford, Halifax, Nova Scotia, B3H 4J1, Canada 2 Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, Pl1 3DH, United Kingdom 3 Ocean Science Division, Bedford Institute of Oceanography, 1 Challenger Drive, Dartmouth, Nova Scotia, B2Y 4A2, Canada 4 Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, Québec, G5L 3A1, Canada 5 National Water Research Institute, Environment Canada, 867 Lakeshore Road, Burlington, Ontario, L7R 4A6, Canada 6 Institute of Marine Science, University of Dar Es Salaam, P.O. Box 668, Zanzibar, Tanzania 7 Environment Canada, 105 Rue McGill, Montréal, Québec, H2Y 2E7, Canada
* Corresponding author: mforget{at}dal.ca
Received on July 14, 2006; revised on November 26, 2006; accepted on January 8, 2006
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Abstract |
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A method is presented for extraction of the photosynthesis-response parameters from profiles of phytoplankton production. The procedure, previously proposed but not tested, is here implemented in various types of aquatic system and a protocol is established for its use. Values of daily primary production integrated over the photic zone were estimated from in situ or simulated in situ incubations in four coastal and open-ocean marine systems; and from photosynthesis-irradiance (P-E) curves in the afore-mentioned marine systems, as well as in two freshwater systems. The slope of the measured daily water-column production (normalised to water-column chlorophyll a biomass) plotted against the daily incident irradiance was variable from system to system (0.09 to 0.60), showing a broader range than previously reported values. Using an iterative procedure we estimated the photosynthetic parameters from this linear relationship. Generally, estimated values lie within the 95% confidence interval of the photosynthetic parameters obtained from the P-E curves, showing that the estimates agree well with measurements. The new method, based on the photophysiological response of the phytoplankton community, provides a way to enhance our ability to compute primary production from remote sensing of ocean colour.
Key Words: photosynthetic parameters • in situ production • ocean-colour application • primary production model
Communicating editor: KJ Flynn
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