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JPR Advance Access published online on November 21, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm093
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

On the relationship between carbon fixation efficiency and bio-optical characteristics of phytoplankton

Laura Prieto1,*, Robert D. Vaillancourt1, Burke Hales2 and John Marra1

1 Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, USA 2 College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331, USA

* Corresponding author. Instituto de Ciencias Marinas de Andalucía (CSIC), 11510 Puerto Real, Cádiz, Spain. Tel.: +34-956-832612; fax: +34-956-834701. E-mail address: laura.prieto{at}icman.csic.es

Received on July 14, 2007; revised on November 6, 2007; accepted on November 19, 2007


  Abstract

Bio-optical characteristics of phytoplankton and carbon assimilation were measured in the NW Atlantic Ocean near the continental shelf break South of New England (40° N/70° W) in August 2002. Discrete samples included: chlorophyll a, phytoplankton absorption (aph), the photosynthetic vs. irradiance (P vs. E) response using carbon fixation, the maximum quantum yield for charge separation at Photosystem II (Fv/Fm) and its recovery kinetics, and the functional absorption cross-section ({sigma}PSII). In this study, we present a robust empirical relationship that illustrates the possibility of estimating photosynthetic carbon uptake using independent measures of absorption and variable fluorescence. Covariations between the initial slope of the photosynthesis-irradiance curve normalized per chlorophyll-a, the aph index of the ratio of photoprotective to total photosynthetic carotenoids and the dark recovery of the maximum quantum yield efficiency of Photosystem II suggest a new pathway to estimate primary production in the marine environment, including the effect of the recent light history. Recovery kinetics in laboratory culture confirmed the effects of light history in the derived parameter from the dark incubations from natural populations.

Key Words: PAM • dark recovery • photosynthesis • phytoplankton • fluorescence

Communicating editor: Kevin J Flynn


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