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FISH DIVERSITY ALONG THE LONGITUDINAL GRADIENT IN A MAN–MADE LAKE OF WEST AFRICA, TAABO HYDROELECTRIC RESERVOIR, IVORY COAST
N. G. Aliko
; Laboratoire d’Environnement et de Biologie Aquatique, UFR–SGE, Université d’Abobo–Adjamé, 02 BP 801 Abidjan 02, Ivory Coast
K. S. Da Costa
; Centre National de Recherche Agronomique (CNRA), Programme Pêche et Aquaculture Continentales (PPAC), 08 BP 33 Abidjan 08
K. F. Konan
; Laboratoire d’Environnement et de Biologie Aquatique, UFR–SGE, Université d’Abobo–Adjamé, 02 BP 801 Abidjan 02, Ivory Coast
A. Ouattara
; Laboratoire d’Environnement et de Biologie Aquatique, UFR–SGE, Université d’Abobo–Adjamé, 02 BP 801 Abidjan 02, Ivory Coast
Sažetak
Fish assemblage patterns in Taabo Reservoir, a hydroelectric lake of Ivory Coast, were studied and related to the longitudinal gradient (river–dam gradient) composed of riverine, transitional, and lacustrine zones. Data were collected at 5 stations and each one was sampled during 5 surveys. Fish community structure was analysed using alpha and beta diversity indices. In total, 53 fish species were obtained in the whole ecosystem. Total species richness recorded at each ecological zone was 42, 43 and 45 species respectively in the riverine, transitional and lacustrine zones. Alpha diversity did not differed significantly along the longitudinal gradient but reached the highest value (33 species) in the transitional zone and the lowest (18 species) occurred in both the riverine and lacustrine zones. Temporal variability of Alpha diversity according to the hydrological regime of the lake differed with the zone. Beta diversity showed that fish assemblages similarity was higher between the transitional and the riverine zones (βw = 0.43) and lower between the riverine and the lacustrine zones (βw = 0.79).
Ključne riječi
Fish diversity; longitudinal gradient; man–made lake; Taabo Reservoir; West Africa
Hrčak ID:
58001
URI
Datum izdavanja:
9.7.2010.
Posjeta: 1.783 *