A model of the relationship between light and primary production in an atoll lagoon /Charpy, Loïc /Charpy Roubaud, Claude ATOLL PHYTOPLANCTON PHYTOBENTHOS LUMIERE PRODUCTION PRIMAIRE RELATION INTERSPECIFIQUE MODELE 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 1990 text https://www.documentation.ird.fr/hor/fdi:34225 fdi:34225 Charpy Loïc, Charpy Roubaud Claude. A model of the relationship between light and primary production in an atoll lagoon. 1990, 70, 357-359 EN POLYNESIE FRANCAISE TUAMOTU