Abstract
The rate of uptake of Zn65 from natural sea water and the primary production of 6 species of marine benthic algae were measured in light and dark bottles suspended in a running sea water aquarium under constant light and temperature conditions. Uptake and production of one species (Chaetomorpha Linum) were also measured in bottles suspended at different depths in a marine pond in order to achieve a gradient of light intensities. Definite uptake occurred in the light, but no measurable uptake occurred in the dark. The initial rate of uptake in the light was proportional to the gross oxygen production which varied with the species. The apparent equilibrium uptake rates in Chaetomorpha at different light intensities were proportional to the net oxygen production. The data indicated that in marine seaweeds zinc is taken up in proportion to the gross oxygen production and accumulated in proportion to the net oxygen production. Consequently Zn65 has possibilities as a tool for the measurement of primary productivity.
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