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Hartbeespoort Dam: A Case Study of a Hypertrophic, Warm, Monomictic Impoundment

  • W. E. Scott
  • P. J. Ashton
  • R. D. Walmsley
  • M. T. Seaman
Part of the Developments in Hydrobiology book series (DIHY, volume 2)

Abstract

Hartbeespoort Dam is a hypertrophic impoundment in South Africa, with large blooms of the potentially toxic blue-green alga Microcystis aeruginosa and an extensive anaerobic zone of up to 40% of the total volume during summer months. The aerial total phosphorus and total nitrogen loading rates are in the order of 20 g/m2/y and 128 g/m2/y respectively. Monthly mean chlorophyll concentrations measured over two years in the impoundment were higher than 30 mg/m3 for at least half of the year. Based on the Vollenweider model the standing crop of phytoplankton is much lower than would be expected in an equivalent north-temperate lake. This can be attributed to limitation of algal production by temperature and available light, as well as a flush-out of phytoplankton during summer flow-in. During 1976 and 1977 up to 60% of the water surface was covered by water hyacinth, Eichhomia crassipes, before removal by chemical spraying.

Keywords

Standing Crop Water Hyacinth Microcystis Aeruginosa Secchi Disc Transparency Large Bloom 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Dr. W. Junk b.v. Publishers-The Hague, The Netherlands 1980

Authors and Affiliations

  • W. E. Scott
    • 1
  • P. J. Ashton
    • 1
  • R. D. Walmsley
    • 1
  • M. T. Seaman
    • 1
  1. 1.National Institute for Water ResearchPretoriaRepublic of South Africa

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