Horizon 1 1 17 ACLN : Articles dans des revues avec comité de lecture non répertoriées par l'AERES Journal of Marine Research 357-359 ATOLL PHYTOPLANCTON PHYTOBENTHOS LUMIERE PRODUCTION PRIMAIRE RELATION INTERSPECIFIQUE MODELE POLYNESIE FRANCAISE TUAMOTU TIKEHAU ATOLL 1990 fdi:34225 ENG Journal of Marine Research https://www.documentation.ird.fr/hor/fdi:34225 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_31-32/34225.pdf 70 Horizon (IRD) The Tikehau atoll (Tuamotu Archipelago, French Polynesia) is located at 14°S 148°W. Phytoplankton and sand microalgae are the most important primary producers of the lagoon. They were studied for 4 years. The relationship between light energy and lagoonal primary production was measured by using the 14C method for phytoplankton and O2 method for phytobenthos. Incubations, carried out #in situ$, were made at different depths and light exposition times. Irradiance was hight and 17% of the light energy measured at the surface reached 25 m (lagoon average depth). Maxima of phytoplankton and phytobenthos productions occured at low depths; there was therefore no photoinhibition of photosynthesis. Correlations between light energy and primary production were strong, especially for phytobenthos. Multiplicative linear regression models (production #vs$ light) associated with an exponential linear regression model (light #vs$ depth), allowed planktonic and benthic primary production to be predicted from the depth and the light energy received at the surface 036MILMAR02