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JOURNAL OF PLANKTON RESEARCH | VOLUME 6 | NUMBER 1 | PAGES 91-105 | 1984
© Oxford University Press

research-article

Factors controlling primary production in a hypertrophic lake (Hartbeespoort Dam, South Africa)

Richard D. Robarts

National Institute for Water Research, CSIR PO Box 395, Pretoria 0001, South Africa

Received on June 1, 1983; accepted on November 1, 1983 The physical factors controlling algal primary production were demonstrated from data collected for a hypertrophic lake. Amax ranged between 12.4 and 5916 mg C m–3 h–1. Areal rates ({Sigma}A) varied between 46.9 and 3381 mg C m–2 h–1. The factors permitting and controlling production were subjectively separated into two categories. In category 1, nutrients (N + P), which were in overabundance, permitted large standing crops of Microcystis aeruginosa to develop (>1000 µg chl a 1–1). Wind patterns determined the dramatic spatial and temporal changes in algal standing crop which could drop to 2.7 µg chl a 1–1. In category 2 were the factors which affected the rate processes. The buoyancy mechanism of Microcystis usually kept the alga in the euphotic zone. A power relationship (r = 0.92, n = 54) between {Sigma}A and Amax/{varepsilon}min showed that with increasing phytoplankton vertical stratification, Amax was increasingly important in the integral. The saturation parameter IK and photosynthetic capacity were temperature dependent. Variations of {Sigma}A were significantly related to changes in water column stability (g cm cm–2) because both axes of the photosynthesis depth-profile were affected by stability changes.


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