Effect of copper sulphate treatment on natural phytoplanktonic communities

Abstract : Copper sulphate treatment is widely used as a global and empirical method to remove or control phytoplankton blooms without precise description of the impact on phytoplanktonic populations. The effects of two copper sulphate treatments on natural phytoplanktonic communities sampled in the spring and summer seasons, were assessed by indoor mesocosm experiments. The initial copper-complexing capacity of each water sample was evaluated before each treatment. The copper concentrations applied were 80 g l−1 and 160 g l−1 of copper, below and above the water complexation capacity, respectively. The phytoplanktonic biomass recovered within a few days after treatment. The highest copper concentration, which generated a highly toxic environment, caused a global decrease in phytoplankton diversity, and led to the development and dominance of nanophytoplanktonic Chlorophyceae. In mesocosms treated with 80µg l−1 of copper, the effect on phytoplanktonic community size-class structure and compositionwas dependent on seasonal variation. This could be related to differences in community composition, and thus to species sensitivity to copper and to differences in copper bioavailability between spring and summer. Both treatments significantly affected cyanobacterial biomass and caused changes in the size-class structure and composition of phytoplanktonic communities which may imply modifications of the ecosystem structure and function.
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https://hal-unilim.archives-ouvertes.fr/hal-00931137
Contributeur : Véronique Deluchat <>
Soumis le : mardi 14 janvier 2014 - 23:45:43
Dernière modification le : lundi 24 septembre 2018 - 09:42:35

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Anne-Hélène Le Jeune, Marie Charpin, Véronique Deluchat, Jean-François Briand, Jean-François Lenain, et al.. Effect of copper sulphate treatment on natural phytoplanktonic communities. Aquatic Toxicology, Elsevier, 2006, 80, pp.267-280. ⟨10.1016/j.aquatox.2006.09.004⟩. ⟨hal-00931137⟩

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