Ashton, PJChutter, PMCochrane, KLDe Moor, FCHely-Hutchinson, JRJarvis, ACRobarts, RDScott, WEThornton, JATwinch, AJZohary, TBostock, LBCombrink, SFenn, TAGrimbeek, LMHerbst, HMHills, MJMitchell, RFPais Madeira, AMvan Blommestein, SD2008-08-252008-08-251985Ashton, PJ et al (Contributors). 1985. Limnology of Hartbeespoort. National Scientific Programmes Unit: CSIR, SANSP Report 110, 1985, pp 279http://hdl.handle.net/10204/2425Hartbeespoort Dam is a hypertrophic, warm, monomictic impoundment. With a mean depth of 9.6 m and a surface area of 20 km2, the system demonstrates that hypertrophy is not confined to small shallow lakes as concluded by Barica (1981). The combination of high nutrient loading, high incident solar radiation, low wind speeds and warm water makes it the ideal environment for the prolific growth of the buoyant blue-green alga, Miarooystis aeruginosa Photosynthetic production of this organism is regulated mainly by the penetration of light through the water column. The Miorooystis population grows to such large levels that the population self-shades itself, that is., the alga is usually the dominant factor regulating light penetration in the water. Unlike most hypertrophic lakes, wide spread anoxia resulting from the die-off of the large Miovoaystis population does not occur in Hartbeespoort Dam. Rather, Microcystis tends to accumulate in large, floating mats termed hyperscums and then is redistributed throughout the dam under favourable wind conditions. However, the anaerobic hypolimnion, which may extend upward to within about 8 m of the lake surface, contains large concentrations of reduced compounds and it is the release and distribution of these throughout the water which may result in almost total lake anoxia at overturnenSANSPHartbeespoort DamLimnologyLimnology Division of the National Insitute for Water ResearchWater Research Comission and Ecosystem programmeReportAshton, P., Chutter, P., Cochrane, K., De Moor, F., Hely-Hutchinson, J., Jarvis, A., ... van Blommestein, S. (1985). <i>Limnology of hartbeespoort dam</i> (CSIR). National Scientific Programmes Unit: CSIR. Retrieved from http://hdl.handle.net/10204/2425Ashton, PJ, PM Chutter, KL Cochrane, FC De Moor, JR Hely-Hutchinson, AC Jarvis, RD Robarts, et al <i>Limnology of hartbeespoort dam.</i> CSIR. National Scientific Programmes Unit: CSIR, 1985. http://hdl.handle.net/10204/2425Ashton P, Chutter P, Cochrane K, De Moor F, Hely-Hutchinson J, Jarvis A, et al. Limnology of hartbeespoort dam. 1985 [cited yyyy month dd]. Available from: http://hdl.handle.net/10204/2425TY - Report AU - Ashton, PJ AU - Chutter, PM AU - Cochrane, KL AU - De Moor, FC AU - Hely-Hutchinson, JR AU - Jarvis, AC AU - Robarts, RD AU - Scott, WE AU - Thornton, JA AU - Twinch, AJ AU - Zohary, T AU - Bostock, LB AU - Combrink, S AU - Fenn, TA AU - Grimbeek, LM AU - Herbst, HM AU - Hills, MJ AU - Mitchell, RF AU - Pais Madeira, AM AU - van Blommestein, SD AB - Hartbeespoort Dam is a hypertrophic, warm, monomictic impoundment. With a mean depth of 9.6 m and a surface area of 20 km2, the system demonstrates that hypertrophy is not confined to small shallow lakes as concluded by Barica (1981). The combination of high nutrient loading, high incident solar radiation, low wind speeds and warm water makes it the ideal environment for the prolific growth of the buoyant blue-green alga, Miarooystis aeruginosa Photosynthetic production of this organism is regulated mainly by the penetration of light through the water column. The Miorooystis population grows to such large levels that the population self-shades itself, that is., the alga is usually the dominant factor regulating light penetration in the water. Unlike most hypertrophic lakes, wide spread anoxia resulting from the die-off of the large Miovoaystis population does not occur in Hartbeespoort Dam. Rather, Microcystis tends to accumulate in large, floating mats termed hyperscums and then is redistributed throughout the dam under favourable wind conditions. However, the anaerobic hypolimnion, which may extend upward to within about 8 m of the lake surface, contains large concentrations of reduced compounds and it is the release and distribution of these throughout the water which may result in almost total lake anoxia at overturn DA - 1985 DB - ResearchSpace DP - CSIR KW - SANSP KW - Hartbeespoort Dam KW - Limnology KW - Limnology Division of the National Insitute for Water Research KW - Water Research Comission and Ecosystem programme LK - https://researchspace.csir.co.za PY - 1985 T1 - Limnology of hartbeespoort dam TI - Limnology of hartbeespoort dam UR - http://hdl.handle.net/10204/2425 ER -