REFERENCES
- BOWLING , L. C. , STEANE , M. S. and TYLER , P. A. 1986 . The spectral distribution and attenuation of underwater irradiance in Tasmanian inland waters. . Freshwater Biol. , 16 : 313 – 335 .
- DUBINSKY , Z. and BERMAN , T. 1979 . Seasonal changes in the spectral composition of downwelling irradiance in
- Kinneret , Lake . (Israel). . Limnol. Oceanogr. , 24 652 – 663 .
- GROBBELAAR , J. U. 1985 . Phytoplankton productivity in turbid waters. . J. Plankton Res. , 7 : 653 – 663 .
- GROBBELAAR , J. U. and STEGMANN , P. 1976 . Biological assessment of the euphotic zone in a turbid man-made lake. . Hydrobiologia , 48 : 263 – 266 .
- HALLDAL , P. 1980 . “ Light and microbial activities ” . In Contemporary microbial ecology Edited by: Ellwood , D. C. , Hedger , J. N. , Latham , M. J. , Lynch , J. M. and Slater , J. H. London : Academic Press .
- KIRK , J. T.O. 1981 . Monte Carlo study of the nature of the underwater light field In, and the relationships between optical properties of, turbid yellow waters. . Aust. J. Mar. Freshwater Res. , 32 : 517 – 532 .
- KIRK , J. T.O. 1983 . Light and photosynthesis in aquatic ecosystems Cambridge : Cambridge University Press .
- ROBARTS , R. D. 1979 . Underwater light penetration, chlorophyll a and primary production in a tropical African lake (Lake McIlwaine, Rhodesia). . Arch. Hydrobiol. , 86 : 423 – 444 .
- ROBARTS , R. D. and ZOHARY , T. 1984 . Microcystis aeruginosa and underwater light attenuation in a hypertrophic lake (Hartbeespoort Dam, South Africa). . J. Ecol. , 72 : 1001 – 1017 .
- SCHANZ , F. 1986 . Depth distribution of phytoplankton and associated spectral changes in downward irradiance in Lake Zurich (1980/81). . Hydrobiologia , 134 : 183 – 192 .
- TALLING , J. F. 1957 . Photosynthetic characteristics of some freshwater plankton diatoms in relation to underwater radiation. . New Phytol. , 56 : 29 – 50 .
- TILZER , M. M. 1983 . The importance of fractional light absorption by photosynthetic pigments for phytoplankton productivity in Lake Constance. . Limnol. Oceanogr. , 18 : 833 – 846 .
- WALMSLEY , R. D. 1984 . A chlorophyll a trophic status classification system for South African impoundments. . J. Environ. Qual. , 13 : 97 – 104 .
- WALMSLEY , R. D. and BRUWER , C. A. 1984 . Water transparency characteristics of South African Impoundments. . J, Limnol. Soc. sth. Afr , 6 : 69 – 76 .
- WALMSLEY , R. D. , BUTTY , M. , VAN DER PIEPEN , H. and GROBLER , D. C. 1980 . Light penetration and the Interrelationship between optical parameters in a turbid subtropical impoundment. . Hydrobiologia , 70 : 145 – 157 .
- WALMSLEY , R. D. , TOERIEN , D. F. and STEYN , D. J. 1978 . An introduction to the limnology of Roodeplaat Dam. . J. Limnol. Soc. sth. Afr. , 4 : 35 – 52 .