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Photosynthesis and nutrient limitation of phytoplankton in the Oosterschelde estuary estimated using PSII quantum efficiency and electron flow
Kromkamp, J.; Peene, J. (1998). Photosynthesis and nutrient limitation of phytoplankton in the Oosterschelde estuary estimated using PSII quantum efficiency and electron flow, in: Dehairs, F.A. et al. (Ed.) Integrated Marine System Analysis. European Network for Integrated Marine System Analysis FWO Vlaanderen: Proceedings of the second network meeting (Brussels, May 29-31, 1997). pp. 3-27
In: Dehairs, F.A.; Elskens, M.; Goeyens, L. (Ed.) (1998). Integrated Marine System Analysis. European Network for Integrated Marine System Analysis FWO Vlaanderen: Proceedings of the second network meeting (Brussels, May 29-31, 1997). VUB. Laboratorium voor Analytische Chemie: Brussel. 376 pp., more

Available in Authors 
    VLIZ: Proceedings D [23820]
Document type: Conference paper

Keywords
    Estuaries; Nutrient deficiency; Photosynthesis; Photosystem II; Phytoplankton; ANE, Netherlands, Oosterschelde [Marine Regions]; Marine

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Abstract
    Photosynthesis was studied in the Oosterschelde estuary (SW Netherlands) using 14C-carbon fixation and PAM chlorophyll fluorescence Nutrient limitation of phytoplankton was estimated from concentrations of dissolved nutrients and nutrient ratio's, and from the maximum photosystem II (PSII) quantum efficiency (Fv/Fm). It was found that the nutrient concentrations were distributed rather homogenously in the estuary However, in the eastern compartment, which has the longest residence time, nutrients disappeared earlier than elsewhere. A decrease in phosphate and silicate concentration to limiting levels was followed by a decrease in maximum PSII quantum efficiency, although the decrease in Fv/Fm occurred 2 weeks later. An increase in phosphate levels coincided with an increase in Fv/Fm, which remained high for the rest of the year, despite low DIN levels later in summer and early autumn. At low irradiances there was a linear relationship between the rate of C- fixation and the rate of PSII electron transport (ETR). However, at higher irradiances the relationship became non-linear. The possible reasons for this non-linearity are discussed.

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