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ZOOPLANKTON COMMUNITIES OF THE SÉLINGUÉ RESERVOIR (MALI, WEST AFRICA). THE ROLE OF ENVIRONMENTAL FACTORS

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The Sélingué Reservoir is a monomictic lake in Mali (West Africa). Previous studies on zooplankton only concerned rotifers; the present work is thus the first also concerning crustacean zooplankton. Environmental variables (transparency, temperature, oxygen, pH, alkalinity, nutrients, suspended solids, and chlorophyll) and zooplankton were investigated once, during the high water period (November 2000), at 9 stations. Thirty-one zooplanktonic taxa were recorded: 23 rotifers of which 5 species (Brachionus patulus, Conochilus unicornis, Lindia torusola, Proales decipiens, Pompholyx sp.) are first records for this ecosystem, 4 cladocerans (Bosmina longirostris, Ceriodaphnia cornuta, Diaphanosoma excisum, and Moina micrura), and 3 cyclopoid copepods (Thermocyclops incisus incisus, Mesocyclops ogunnus, and Eucyclops sp.). Calanoid copepods were totally absent. A clear relationship between environmental conditions and zooplankton was shown using a multivariate analysis (coinertia), which discriminated three ecological zones on the basis of both datasets. Several zooplankton species were associated with alkaline and turbid waters, near the mouths of the two tributaries (the Sankarani and Balé rivers). Other species characterized more transparent and nanophytoplankton-rich waters at the confluence zone, far from the flood influence. Our results clearly show the shaping role of environmental conditions and confirm the suitability of zooplankton as an indicator of water quality.

10.1163/9789004188280_018
/content/books/b9789004188280s018
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