Trophic relationships in the recently impounded Bagré reservoir in Burkina Faso |
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Authors: | Maria Concepcion Villanueva Maxime Ouedraogo Jacques Moreau |
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Affiliation: | 1. INP/ENSAT BP 32607 Auzeville Tolosane, 31 326 Castanet Tolosan, France;2. Maîtrise d’Ouvrage de Bagré SOCREGE 01 BP Ouagadougou 01, Burkina Faso |
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Abstract: | The trophic dynamics of Bagré reservoir which has been recently impounded in Burkina Faso was based on the data collected during 1997–1998 period using the Ecopath model and software. Total fish biomass is 22.63 t km−2 and mainly represents trophic levels (TLs) 2 and 3. The trophic food chain is relatively long and the overall transfer efficiency is quite low. Grazing foodweb based on primary producers is prominent in the reservoir ecosystem and detritus plays a less significant role. Seasonal and long-term variations in water quality have significant influences on the lower TLs clearly showing a bottom-up functioning of the ecosystem. Environmental degradations, such as siltation occurring in the lake, suggest possible risks in limiting ecosystem productivity. |
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Keywords: | African reservoirs Ecopath Reservoir fisheries Trophic networks |
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