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Une approche vers l'estimation de la production potentielle du phytoplancton par analyse des cinétiques d'induction de fluorescence
Authors:J Neveux  H Jupin
Institution:(1) Laboratoire Arago, F-66650 Banyuls-sur-Mer, France;(2) Laboratoire de Biologie Végétale, Centre Universitaire de Perpignan, Avenue de Villeneuve, F-66000 Perpignan, France
Abstract:In vivo chlorophyll fluorescence is particularly interesting ot ecologists because of various concepts (biomass, productivity, physiological state) associated with it. Using a modified spectrophotofluorometer, we have studied the kinetics of fluorescence in unialgal cultures and in a natural population of marine phytoplankton. Our apparatus did not achieve satisfactory results with cell suspensions having a chlorophyll concentration less than 10 mgrg l-1. We have also tested a method for estimating kinetics of diluted cultures and marine phytoplankton using cells collected on glass-fibre filters. For unialgal cultures in the exponential growth phase, the method proved satisfactory, and results obtained from both cell suspensions and filters were in good agreement. However, for aged cultures (principally diatoms) and natural marine phytoplankton the method proved unsuitable. The kinetics of fluorescence induction vary according to taxonomic position of the cells, light intensity of the measuring excitation beam and productiveness of the culture medium. The importance of the kinetics of fluorescence induction for characterization of phytoplankton activity is discussed.
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