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Journal of Plankton Research, Vol 21, 1911-1921, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Assimilation and release of 14C in a tropical strain of Cryptomonas obovata (Cryptophyceae) exposed to several irradiances

D Giroldo and A Vieira
Federal University of São Carlos, Department of Botany, CEP 13565-905, CP 676, São Carlos SP, Brazil

Carbon assimilation (14C) and dissolved organic carbon (DO14C) release by a tropical strain of Cryptomonas obovata was studied. Cells were exposed to a range of irradiances (0-2000 mol m-2 s-1) using axenic batch cultures in the laboratory (Ek = 180 mol m-2s-1). At up to 2000 mol m-2s-1, carbon assimilation was not inhibited and an acclimation to low irradiances was observed. DO14C release was dependent on carbon fixation and no increase was detected under high irradiances. To determine particulate organic carbon (PO14C) loss and CO14C release cells acclimated to 350 mol m-2 s-1 were incubated during 4 h at 35, 350, 850 and 1900 mol m-2 s-1. DO14C release was responsible for 30% of the PO14C loss at 1900 mol m-2s-1. High- and low-molecular-weight (HMW, LMW) compounds were released by C.obovata under all irradiance conditions. However, increased release with exposure time was observed only for the HMW compounds.
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 J PLANKTON RESHome page
D. Giroldo and A. A. H. Vieira
Polymeric and free sugars released by three phytoplanktonic species from a freshwater tropical eutrophic reservoir
J. Plankton Res., July 1, 2005; 27(7): 695 - 705.
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