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Free Content Diurnal Variation in Phytoplankton

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Studies on the diurnal variation of phytoplankton and chlorophyll a at stations in the Tongue of the Ocean, and Guinea and Benguela currents (tropical and sub-tropical), showed no constant relationship between chlorophyll a and the numbers of organisms. The organisms always decreased at night and increased to a daytime maximum. It is believed that the fluctuation of numbers is due to grazing as it was most pronounced in areas where the deep scattering layer was marked and where vertical migration of this layer occurred. If this is true the generation time of the smaller phytoplankton is much shorter than is generally believed.

Document Type: Research Article

Publication date: 1966-09-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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