AME 51:1-11 (2008)  -  DOI: https://doi.org/10.3354/ame01187

Effects of temperature on photosynthetic parameters and TEP production in eight species of marine microalgae

Pascal Claquin1,*, Ian Probert2, Sébastien Lefebvre1, Benoît Veron1,3

1Laboratoire de Biologie et Biotechnologies Marines UMR M 100 IFREMER–PE2M, Université de Caen Basse-Normandie, Esplanade de la paix, 14032 Caen Cedex, France
2CNRS Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff Cedex, France
3Algobank Caen, Université de Caen Basse-Normandie, Esplanade de la paix, 14032 Caen Cedex, France

ABSTRACT: The effects of temperature on photosynthesis and transparent exopolymeric particle (TEP) production for 8 planktonic species belonging to 3 microalgal phyla (Heteronkontophyta, Dinophyta and Haptophyta) were investigated. Nutrient-replete semi-continuous cultures were grown at 13 temperatures between 5 and 25¡C or 35¡C (depending on the lethal temperature). A non-linear parametric model was applied to data on growth rate, photosynthetic parameters (electron transport rate, ETR), light utilization efficiency, a) and TEP production. The maximal photosynthetic activity at optimal temperature of production varied from 2.70 (Pavlova lutheri) to 4.64 (Thalassiosira pseudonana) mmol eÐ (mg chl a)Ð1 hÐ1. The variation in the photoacclimation state confirmed the similarity of acclimation trends at low temperature to those at high irradiance. However, different responses were observed between species, highlighting the fact that photoacclimation mechanisms vary interspecifically for both light harvesting and downstream photosynthetic metabolism. TEP production was lowest in Isochrysis galbana and greatest in Lepidodinium chlorophorum (6 vs. 380 mg xanthan equiv [mg chl a]Ð1 dÐ1). The proportion of carbon fixed by photosynthesis and excreted as TEP was 70.8% for L. chlorophorum, while other species excreted 6.7 to 30%. A linear relationship was found between the ETR(T) and TEP(T) models for the 3 diatoms, indicating a coupling between photosynthetic activity and TEP production. This provides a new outlook on carbon excretion, which has classically been described as a consequence of nutrient stress.


KEY WORDS: Transparent exopolymeric particle · Excretion · Electron transport rate · ETR · Diatom · Dinophyta · Haptophyta


Full text in pdf format 
Cite this article as: Claquin P, Probert I, Lefebvre S, Veron B (2008) Effects of temperature on photosynthetic parameters and TEP production in eight species of marine microalgae. Aquat Microb Ecol 51:1-11. https://doi.org/10.3354/ame01187

Export citation
Mail this link - Contents Mailing Lists - RSS
- -