Abstract
Macroalgae production studies are handicapped by the broad range of variability within experimental replicates. Practically, it is impossible to obtain identical duplicate samples of plant material for the dark and light bottles. A new modification of the oxygen technique, described here, eliminates this difficulty, and also provides an approximation of the respiration in the light bottle. It consists of measurements of dissolved oxygen changes, produced by a single sample of algal biomass, incubated in short alternate periods of light and dark. In this way, each thallus tested provides daily curves of net photosynthesis and respiration. From the data obtained, daily curves of primary productivity are extrapolated.
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