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Objective : This study is the first assessment of zooplankton community of the Lake Hlan. It aims to assess zooplankton diversity through hydrological season. Methods and Results : It was carried out from May to December 2012. Monthly  plankton harvesting were performed, using plankton net of 30->m mesh. Three  vertical samplings through the Lake body depth were done at each station and mixed to have a composite sample. Environmental parameters were also assessed at the same time. The zooplankton diversity founded was composed of 45 species (33 rotifers, 6 cladocera and 6 copepods). The community was highly diversified and characteristic of balanced ecosystem. The Shannon diversity index values were ranged between 4.4 bit.ind-1 and 5.1 bit.ind-1. The taxonomic composition and the species abundance are affected by the flood coming, when the upstream station is different from the two other at the biological level. Conclusion : The zooplankton community of Lake Hlan has low specific richness, but has very good diversity index across hydrological seasons. Its ecosystem is then lowly affected by anthropological factors. The Lake Hlan currently continues to be a reference ecosystem in ecological status evaluation in Benin republic, since its localization has low accessibility. Keywords : Biodiversity; Community structure; Hydrological season; Zooplankton Diversite et variation saisonniere du zooplancton du lac Hlan, Republique du Benin Objectif : Cette etude est la premiere evaluation de la communaute zooplanctonique du lac Hlan. Il vise a evaluer la diversite du zooplancton au travers des saisons hydrologiques. Methodes et resultats : L’etude a ete realisee de Mai a Decembre 2012. Le plancton a ete mensuellement echantillonne sur trois stations representants le plan  horizontal du lac. Un filet a plancton conique de 30 >m de vide de maille a ete  utilise. Un echantillonnage vertical sur toute la colonne du plan d’eau a ete realise a chaque station. Les parametres environnementaux ont egalement releves. Un total de 45 especes de zooplancton etait identifie (33 rotiferes, 6 cladoceres et 6  copepodes). La communaute etait tres bien diversifiee et caracteristique  d'ecosysteme equilibre. La valeur de l'indice de Shannon a varie entre 4,4 bit.ind-1 et 5,1 bit.ind-1. La composition taxinomique et l'abondance des especes ont ete affectees par la venue de la crue, alors que la station en amont etait differente des deux autres au niveau biologique. Conclusion : La communaute zooplanctonique du lac Hlan a une faible richesse  specifique, mais a un bon indice de diversite a travers les saisons hydrologiques. L’ecosysteme est alors faiblement affecte par des facteurs anthropologiques. Le lac Hlan continue actuellement d'etre un ecosysteme de reference dans l'evaluation de l'etat ecologique en republique du Benin, sa localisation etant faiblement accessible. Mots-cles : Biodiversite; Saison hydrologique; Structure d’assemblage; zooplancton

Diversity and seasonal variation of zooplankton of Lake Hlan, Republic of Bénin (West Africa)