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Objectifs: Cette etude vise a determiner la repartition saisonniere du zooplancton en relation avec les caracteristiques environnementales dans le lac Kaby situe au Centre-Est de la Cote d'Ivoire dans la region du Moronou. Methode et resultats: Le zooplancton a ete echantillonne mensuellement d’Avril 2017 a Mars 2018 a l’aide d’un filet a plancton de 60 μm de vide de maille. Au total 31 taxons ont ete observes (22 Rotiferes, 3 Copepodes, 3 Cladoceres et 3 autres organismes). Le groupe des Rotiferes (45,79%) a domine l’abondance totale. En termes de densite, les Rotiferes sont largement domines par les Brachionidae (51,60%). Globalement, la richesse taxonomique et l’abondance les plus fortes ont ete enregistrees pendant la saison des pluies 26 taxons contre 22 taxons en saison seche. Les variables Influencant fortement la diversite taxonomique et l’abondance sont la vitesse du courant, la conductivite, la transparence, la temperature. Conclusion et application. Les caracteristiques physico-chimiques du lac Kaby determinent une biodiversite zooplanctonique surtout marquee par la presence de 31 taxons principalement composes de rotiferes (45,79 %), de copepodes (40,98%), de cladoceres (4,61%) et des autres organismes (8,59%). Par ailleurs, la distribution saisonniere du zooplancton est sous la dependance des parametres Physico-chimiques, en particulier la conductivite, la transparence, le pH, la temperature, la teneur en nitrate revelant ainsi de fortes proportions d’especes tolerantes a la pollution organique au cours de l’etude. Cette etude a permis de determiner l’etat de l’eau du lac Kaby a travers les organismes zooplanctoniques qui y vivent. Et confirme la possibilite d’utiliser les Brachionidae comme indicateur de pollution. Mots cles: Zooplancton, diversite, abondance, pollution organique, repartition saisonniere English Title: Seasonal distribution of zooplankton in relation to environmental characteristics in Kaby Lake (Bongouanou, Ivory Coast) English Abstract Objectives: This study aims to determine the seasonal distribution of zooplankton in relation to the environmental characteristics in Lake Kaby located in the Center-East of Cote d'Ivoire in the Moronou region. Method and Results: Zooplankton was sampled monthly from April 2017 to March 2018 using a 60 μm mesh plankton net. A total of 31 taxa were observed (22 Rotifers, 3 Copepods, 3 Cladocerans and 3 other organisms). Rotifers are the dominant group with (45.79%) total abundance. In terms of density, Rotifers are largely dominated by Brachionidae (51.60%). Overall, the highest taxonomic richness and abundance were recorded during the rainy season 26 taxa versus 22 taxa in the dry season. Variables strongly influencing taxonomic diversity and abundance are current velocity, conductivity, transparency, temperature. Conclusion and application: The physicochemical characteristics of Lake Kaby determine a zooplanktonic biodiversity mainly marked by the presence of 31 taxa mainly composed of rotifers (45.79%), copepods (40.98%) and cladocerans (4.61%.) and other organizations (8.59%). Furthermore, the seasonal distribution of zooplankton depends on the physico-chemical parameters, in particular the conductivity, the transparency, the pH, the temperature and the nitrate content, thus revealing high proportions of species tolerant to organic pollution. This study made it possible to determine the water status of Lake Kaby through the zooplankton organisms that live there. And confirms the possibility of using Brachionidae as a pollution indicator. Keywords: Zooplankton, diversity, abundance, organic pollution, seasonal distribution

Répartition saisonnière du zooplancton en relation avec les caractéristiques environnementale dans le lac Kaby (Bongouanou, Côte d’Ivoire)