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Objectif : Une etude visant a determiner la distribution spatio-temporelle du zooplancton en relation avec les variables environnementales du ruisseau Kondi, cours d’eau du reseau hydrographique du Wouri qui arrose Douala, ville portuaire et metropole economique du Cameroun a ete menee d’avril 2011 a mai 2012. Methodologie et resultats : Trois sites, situes respectivement dans les cours superieur, moyen et inferieur ont ete echantillonnes. Les teneurs elevees des variables physicochimiques etudiees montrent que les eaux du Kondi sont eutrophes a hypereutrophes. Le zooplancton constitue de 56 especes dont 40 rotiferes, 12 cladoceres, 3 copepodes et 01 gastrotriche est domine par les rotiferes qui representent 75,90 % de l’abondance totale. L’espece Rotaria rotaria est la plus abondante avec une abondance relative de 36,73 %. La communaute zooplanctonique presente les effectifs les plus eleves pendant la saison seche (decembre, janvier, fevrier) lorsque les concentrations en nutriments sont les plus fortes dans le cours d’eau. Conclusion et applications : Le coefficient de correlation de Spearmann a permis de reveler des liaisons significatives entre Rotaria rotaria, Cephalodella gibba, Platyias quadricornis, Rotaria neptunia, Mytilina bisulcata, especes caracteristiques des milieux eutrophes et les fortes valeurs de quelques variables environnementales telles que la conductivite electrique, les orthophosphates et l’azote ammoniacal, confirmant ainsi la grande degradation de ces eaux et l’usage de ces especes comme indicatrices de la pollution en milieu lotique. Mots cles : zooplancton, eutrophisation, distribution spatio-temporelle, riviere Kondi, Douala Spatio-temporal distribution of zooplankton in relation with the abiotics factors in an urban  hydrosystem : the Kondi stream (Douala, Cameroon) Objectives : A study aimed at determining the spatiotemporal distribution of zooplankton in relation with the environmental variables of the Kondi, a watercourse of Wouri hydrographic basin, harbour city and economic metropolis of Cameroon was led from April 2011 to May 2012. Methodology and Results : Three sites, situated respectively in the upper, mid and lower watercourses were sampled. The high values variables studied showed that waters of the Kondi are eutrophic to hypereutrophic. The zooplankton constituted of 56 species of which 40 rotifers, 12 cladocerans, 3 copepods and 1 gastrotriche which was dominated by the rotifers which represented 75.90 % of the total abundance of the zooplankton. This fauna was dominated by the species R. rotaria which constituted 36.73 % of the zooplankton community. These zooplanctonic communities reached its maximum development during the dry season (December, January, February) when nutrient concentrations were highest in the watercourse. Conclusion and application : The Spearmann’s coefficient of correlation revealed relations between R. rotaria ,  C. gibba , P. quadricornis , R. neptunia and Mytilina bisulcata , species indicators of eutrophic hydrosystems and the high values of some environmental variables such as electric conductivity, orthophosphates and ammonia nitrogen, confirms the strongly polluted character of these waters and the potential used of zooplankton communities as indicator of water quality even in lotic milieu.  Keywords : zooplankton, eutrophication, spatio-temporal distribution, Kondi stream, Douala

journal of applied biosciences

Distribution spatio-temporelle du zooplancton en relation avec les facteurs abiotiques dans un hydrosystème urbain : le ruisseau Kondi (Douala, Cameroun)