Circadian photosynthetic activity of natural marine phytoplankton isolated in a tank |
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| Authors: | Legendre, L. Demers, S. Garside, C. Haugen, E.M. Phinney, D.A. Shapiro, L.P. Therriault, J.-C. Yentsch, C.M. |
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| Affiliation: | 2Institut Maurice-Lamontagne, Ministère des Pêches et des Océans 850 route de la Mer, Mont-Joli, Québec, Canada G5H 3Z4 3Bigelow Laboratory for Ocean Sciences, McKown Point West Boothbay Harbor, ME 04575, USA Département de biologie, Université Laval Québec, Québec, Canada G1K 7P4 |
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| Abstract: | A large (1200 1) seawater sample from the Gulf of Maine waskept under constant temperature and light conditions for a periodof 72 h. Circadian variations were observed in the photosyntheticcapacity (PBmax) and efficiency ( B); these occurred in phase,and were not related to changes in chlorophyll concentrations.Such observations are consistent with the hypothesis that oscillationsin photosynthetic characteristics of natural phytoplankton aremediated by an endogenous circadian rhythm. 1 Bigelow Laboratory contribution 87023 and a contribution tothe programs of GIROQ (Groupe interuniversitaire de recherchesoceanographiques du Québec) and of the Maurice-LamontagneInstitute |
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