Influence of watershed activities on the water quality and fish assemblages of a tropical African reservoir

Mustapha, Moshood K.

dc.creator	Mustapha, Moshood K.
dc.date	2008-06-09
dc.date.accessioned	2016-05-03T15:34:59Z
dc.date.available	2016-05-03T15:34:59Z
dc.identifier	http://revistas.ucr.ac.cr/index.php/rbt/article/view/5486
dc.identifier	10.15517/rbt.v57i3.5486
dc.identifier.uri	https://hdl.handle.net/10669/27586
dc.description	Agricultural and fisheries activities around the watershed of an African tropical reservoir (Oyun reservoir, Offa, Nigeria) were found to contribute significantly to water quality deterioration of the dam axis of the reservoir, leading to eutrophication of that part of the reservoir. This is evident from the high amount of nitrate (6.4 mg/l), phosphate (2.2 mg/l) and sulphate (16.9 mg/l) in the water body which was higher than most other reservoirs in Nigeria. These nutrients originate in fertilizer run-offs from nearby farmlands and were found in higher concentrations in the rainy season which is usually the peak of agricultural activities in the locality. The eutrophication was more pronounced on the dam axis because it is the point of greatest human contact where pressure and run-off of sediments were high. The eutrophication altered the food web cycle which consequently affected the fish species composition and abundance with the dominance of cichlids (planktivorous group) and decline of some species in the fish population. Best management practices (BMP) to control and reduce the eutrophication and improve water quality and fish assemblages should be adopted and adapted to suit the situation in the reservoir.	en-US
dc.format	application/pdf
dc.language	eng
dc.publisher	Universidad de Costa Rica	en-US
dc.rights	Copyright (c) 2014 International Journal of Tropical Biology and Conservation	en-US
dc.source	Revista de Biología Tropical/International Journal of Tropical Biology and Conservation; Vol. 57 (3) September 2009	es-ES
dc.source	2215-2075
dc.source	0034-7744
dc.source	10.15517/rbt.v57i3
dc.title	Influence of watershed activities on the water quality and fish assemblages of a tropical African reservoir	en-US
dc.type	artículo original
dc.coverage	CRC	en-US

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