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L\'etude comparative de la variabilite morphologique de quatre populations naturelles de Sarotherodon melanotheron melanotheron revele l\'existence de differenciations significatives et importantes entre ces dernieres. 16 des 24 caracteres analyses sont discriminants et permettent, par leur combinaison, de caracteriser les differentes populations etudiees. Si la morphologie des poissons est partiellement due a l\'environnement, les divergences observees entre ces populations genetiquement differenciees suggerent que les systemes genetiques impliques dans ces phenotypes sontsous selection dans les environnements concernes. De sorte que, les changements morphologiques adaptatifs releves semblent traduire le deroulement de phenomenes evolutifs au sein des populations de S. m. melanotheron. The comparative survey of morphometric variability of four natural populations of Sarotherodon melanotheron melanotheron reveals meaningful and important differentiations between them. 16 of the 24 characters analyzed are discriminative and permit by their combination to characterize the different populations studied. If fish morphology is partially due to environment, the divergences observed between these genetically differentiated populations suggest that the genetic systems that involve these phenotypes are under selection in the concerned environments. So adaptive morphological changes observed in these populations reveal probably the progress of evolutionary phenomena within the of S. m. melanotheron. Keywords : Biometry, adaptation, Cichlidae, lagoon, Lake, West Africa. Sciences & Nature Vol. 5 (1) 2008: pp. 15-27

sciences and nature. série a, biosciences agronomie environnement biotechnologie

Différenciation morphologique des populations naturelles d\'une sousespèce de tilapia &lt;i&gt;Sarotherodon melanotheron melanotheron&lt;/i&gt; Rüppell, 1852 (Teleostei ; Cichlidae) de Côte d\'Ivoire