Abstract
In Thingvallavatn, a large, clearwater lake in southwestern Iceland, the total primary production of Nitella opaca Ag. beds in the 10-20 m depth zone was 6-10 g C m #752 yr #751 in 1987, but was possibly as high as 25-33 g C m yr #751 in 1985 (about one fifth of the total primary production in the lake). A major part of the community production was contributed by epiphytic and planktonic microalgae. The macroalgae had wide year-to-year variation in zonation and productivity, primarily due to differences in underwater light climate and water currents (...)
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