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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3586

Title: Responses of phytoplankton upon exposure to a mixture of acid mine drainage and high levels of nutrient pollution in Lake Loskop, South Africa.
Authors: Oberholster, PJ
Myburgh, JG
Ashton, PJ
Botha, AM
Keywords: Phytoplankton populations
Cyanobacteria
Phytoplankton bioassay
Chlorophyll concentrations
Metal ions
Lake Loskop
Nutrient pollution
Acid mine drainage
Ecotoxicology
Environmental safety
Issue Date: 2009
Publisher: Elsevier
Citation: Oberholster, PJ et al. 2009. Responses of phytoplankton upon exposure to a mixture of acid mine drainage and high levels of nutrient pollution in Lake Loskop, South Africa. Ecotoxicology and Environmental Safety (2009), pp 10
Abstract: The relationships between water quality and the phytoplankton community within Lake Loskop were studied during the late summer and autumn of 2008 to evaluate the impacts of acid mine drainage and high nutrient concentrations. The higher concentrations of metal ions and sulphate had adverse effects on certain phytoplankton species in the inflowing riverine zone of Lake Loskop, in comparison to the reference site in the lacustrine zone of the lake, which was dominated by the larger and slower growing late summer species of Coelastrum reticulum Nageli, Straurastrumanatinum Meyen ex Ralfs and Ceratium hirundinella Muller. The high nutrient concentrations (nitrogen:17mgl-1 and orthophosphate: 0.7mgl-1) during the mid-summer peak of the rainy season were associated with the development of a bloom of the cyanobacterium Microcystis. Water quality data associated with the development of the Microcystis bloom suggest that the aquatic system of Lake Loskop has now entered an alternate, hyper trophic regime. This change over shadowed the adverse effects of high concentrations of heavy metal ions and low pH. Through out this study, the reference site in the lacustrine zone o fLake Loskop had lower concentrations of metal ions and sulphate, and higher pH values. The response of phytoplankton bioassays on integrated water samples from the different sampling sites did provide potential answers to the reasons for the absence of the algal group Chlorophyceae in the phytoplankton community structure in the riverine zone of the lake
Description: Copyright: 2009 Published by Elsevier Inc.
URI: http://hdl.handle.net/10204/3586
ISSN: 0147-6513
Appears in Collections:Pollution and waste
Environmental management
Water resources and human health
Accessibility research
General science, engineering & technology

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