Horizontal Distribution of the Cell Abundance and Toxicity of Microcystis in a Hypereutrophic Moroccan Reservoir
Samira Samoudi1, Delphine Latour2,3, Jiёl Robin4, Marion Sabart2,3, Benjamin Misson2,3, Hammou Hanane Ait1, Khadija Mouhri1, Mohammed Loudiki1
1University Cadi Ayyad, BP 2390, 40000 Marrakesh, Morocco
2University Blaise Pascal, BP 10448, 63000 Clermont Ferrand, France
3UMR 6023, LMGE, CNRS, BP 80026, 63171 Aubiиre Cedex, France
4University of Lyon, 23 Rue Jean Baldassini 69364 Lyon Cedex 07, France
Keywords: reservoir, Microcystis, Microcystins, spatial heterogeneity, wind, nutrients, inflow of water
Abstract
The first results of the horizontal distribution of the cell abundance and toxicity of Microcystis in the hypereutrophic Moroccan reservoir Lalla Takerkoust are reported. An unexpected spatio-temporal heterogeneity has been shown between Microcystis abundance and microcystins concentrations. The principal determining factors were analyzed in order to identify the most likely sites for the proliferation and/or accumulation of Microcystis in this reservoir. The horizontal heterogeneity seems to be mainly influenced by the wind direction and inflows. The results can serve as reference data for monitoring cyanobacterial water blooms and associated cyanotoxins in the lake.
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