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Free Content Primary Production and Phytoplankton in Equatorial Waters

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Abstract:

During March, 1963, primary production and standing stock of phytoplankton were measured at six stations in a limited area of the equatorial Atlantic. A progressive decrease in production (as measured by C14 uptake) and in numbers of organisms per liter was found from the coastal area to the oceanic region.

Values for primary production ranged from 0.864 to 0.014 g C/m2/day from the more coastal station (No. 1) to the oceanic one (No. 6).

Maximum standing stock was found at the surface at station 1 (523,180 cells/liter), and the minimum at 15 m depth, at station 6 (8,700 cells/liter). The phytoplankton appeared to be concentrated in the upper layers of the euphotic zone at the coastal station (No. 1).

A gradual change in the relative abundance of the different groups was found. At the stations near to the coast, neritic diatoms constituted the bulk of the phytoplankton, whereas at the oceanic stations, coccolithophores and oceanic forms of diatoms were more abundant.

Document Type: Research Article

Publication date: December 1, 1967

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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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