Lake Mcilwaine

1. Front Matter

   Pages I-XII

   PDF

2. Introduction

   1. The creation of Lake McIlwaine: history and design

      • N. A. Burke, J. A. Thornton

      Pages 1-9

3. Geology and geography

   1. Land use survey of the Upper Hunyani catchment

      • K. Munzwa

      Pages 11-22

4. Physics

   1. Physical limnology

      • P. R. B. Ward

      Pages 23-34

   2. The hydrology of the Lake McIlwaine catchment

      • B. R. Ballinger, J. A. Thornton

      Pages 34-41

5. Chemistry

   1. Water chemistry and nutrient budgets

      • J. A. Thornton, W. K. Nduku

      Pages 43-59

   2. The sediments

      • R. Chikwanha, W. K. Nduku, J. A. Thornton

      Pages 59-71

   3. The effects of urban run-off

      • R. S. Hatherly, W. K. Nduku, J. A. Thornton, K. A. Viewing

      Pages 71-94

   4. Insecticides in Lake McIlwaine, Zimbabwe

      • Yvonne A. Greichus

      Pages 94-99

6. Biology

   1. An SEM study of bacteria and Zooplankton food sources in Lake McIlwaine

      • Monika Boye-Chisholm, R. D. Robarts

      Pages 101-106

   2. Phytoplankton, primary production and nutrient limitation

      • R. D. Robarts, J. A. Thornton, Colleen J. Watts

      Pages 106-133

   3. Zooplankton and secondary production

      • J. A. Thornton, Helen J. Taussig

      Pages 133-136

   4. Aquatic macrophytes and Eichhornia crassipes

      • M. J. F. Jarvis, D. S. Mitchell, J. A. Thornton

      Pages 137-144

   5. The benthic fauna of Lake McIlwaine

      • B. E. Marshall

      Pages 144-155

   6. The fish of Lake McIlwaine

      • B. E. Marshall

      Pages 156-188

   7. Avifauna of Lake McIlwaine

      • M. J. F. Jarvis

      Pages 188-194

7. Utilisation, management and conservation

   1. Water pollution: perspectives and control

      • D. B. Rowe

      Pages 195-201

   2. Water supply and sewage treatment in relation to water quality in Lake McIlwaine

      • J. McKendrick

      Pages 202-217

   3. Fisheries

      • K. L. Coehrane

      Pages 217-220

   4. Recreation

      • G. F. T. Child, J. A. Thornton

      Pages 221-226

'And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters. ' Genesis 1:6 Lake McIlwaine is a man-made lake. It was formed in 1952 by the Hunyani­ poort Dam and is situated on the Hunyani River some 37 km southwest of Salisbury* in the Republic of Zimbabwe**. It is a lake of many aspects: being a popular recreational site, the City's primary water supply reservoir (and the fourth largest impoundment in Zimbabwe), a source of irrigation water to downstream farms, an important fishery, and, until the 1970s, the receptacle of Salisbury's sewage effluent. It is, in short, typical of so many 'urban' lakes in Africa and throughout the world. Lake McIlwaine is also unique, to my knowledge: being amongst the first of the major man-made lakes on the continent to suffer from what is known as cultural eutrophication, and the first to be r:ehabilitated to a mesotrophic state through a rational programme of lake management. This volume synthesizes this process of eutrophication and recovery in terms of the geology and geography (Chapter 2), physics (Chapter 3), chemistry (Chapter 4) and biology (Chapter 5) of the lake, and, whilst discussion of the trophic relationships between these components is beyond the scope of this monograph, discusses its utilisation, conservation and management (Chapter 6). * Subsequent to writing, the name of the Zimbabwean capital was changed to Harare on 18 April 1982. - Ed.

• Eutrophication
• benthic
• fisheries
• limnology
• macrophytes
• phytoplankton
• water quality
• zooplankton

• Limnology Division, National Institute for Water Research, CSIR, Pretoria, Republic of South Africa

  Jeffrey A. Thornton

• Department of National Parks and Wild Life Management, Causeway, Salisbury, Zimbabwe

  W. K. Nduku

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