Metal toxicity in marine ecosystems is a growing issue owing to terrestrial runoff and anthropogenic pollution. Heterocapsa cf. bohaiensis, a newly isolated dinoflagellate from New Caledonia, was cultivated in photobioreactors operating continuously with high concentrations of nickel (1.70 10-5M) (Ni2+) and/or iron (1.79 10-5M) (Fe2+) and their photosynthetic efficiency was assessed. The photosynthetic measurements indicated that H. cf. bohaiensis was tolerant to Ni2+ but sensitive to Fe2+ high concentrations. In the presence of Fe2+, maximum quantum efficiency and maximal relative electron transport rate decreased from 0.62 to 0.47 and from 156 to 102, respectively. The JIP-tests suggested a reduction of the photosynthesis in response to Fe2+ due to a disruption in the electron transport chain rather than a defect in the light absorption and trapping capacity which were on the contrary enhanced by Fe2+. These results bring new knowledge on the impact of nickel and iron on microalgae photosynthetic pathways.

ADECAL Technopole 1 Bis Rue Berthelot 98846 Nouméa New Caledonia

CNRS Ifremer IRD University of New Caledonia University of La Réunion UMR 9220 ENTROPIE 101 Promenade Roger Laroque Nouméa New Caledonia

CRESICA 98851 Nouméa New Caledonia

Ifremer IRD University of New Caledonia University of La Réunion CNRS UMR 9220 ENTROPIE 101 Promenade Roger Laroque 98897 Nouméa New Caledonia

Ifremer Littoral LERBO Place de la Croix Concarneau F 29900 France

ISEA EA7484 Campus de Nouville University of New Caledonia 98851 Nouméa New Caledonia

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