MELIMEX,an experimental heavy metal pollution study: Effects of increased heavy metal loads on phytoplankton communities |
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| Authors: | René Gächter Dr Antonín Máre? |
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| Institution: | (1) Present address: Swiss Federal Institute for Water Resources and Water Pollution Control (EAWAG) at Swiss Federal Institutes of Technology (ETH), CH-6047 Kastanienbaum, Switzerland |
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| Abstract: | Long-term impacts of increased metal loading (Hg, Cu, Cd, Zn and Pb) on phytoplankton communities of large limno-corrals (diameter
12 m, depth 10 m) were studied. Increased metal concentrations initially lowered phytoplankton biomass, as well as species
number and photosynthetic activity of phytoplankton. They caused changes in metal speciation and shifts in phytoplankton community
structure, favoring less susceptible species. Although adaptation was not sufficient to completely prevent the metal-induced
depression of photosynthesis, due to depressed zooplankton grazing, at the end of the experiment even higher phytoplankton
densities were observed in the metal-loaded corrals than in the control. |
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