Productivity of Seaweeds: The Potential and the Reality
It has been known that for more than a decade that seaweeds are potentially very productive indeed. When measuring carbon fixation of individual plants under nearly ideal conditions, both Kanwisher (1) and Wassman and Ramus (2) found rates up to 22 g C m -2day-1 gross, or 12 g C m-2day-1 net. In nature, conditions are seldom ideal, but fixation rates of 5 to 10 g C m-2day-1 are not uncommon. For example, Littler and Murray (3) reviewed the performance of a variety of marine macrophytes and found that productivity ranged from 0.4 to 9.0 g C m-2 day-1. Towle and Pearse (4) made a careful study of 14C uptake by the giant kelp Macrocystis and concluded that there was a net assimilation of 6.8 g C m-2 in the course of a 12-h day.
KeywordsNova Scotia Dissolve Inorganic Nitrogen Spring Bloom Light Flux Carbohydrate Reserve
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