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STRUCTURE AND DIVERSITY OF THE VARIOUS ZOOPLANCTONIC GROUPS IN THE BAY OF TABOUNSOU
*Mamadouba Camara and Ansoumane Keïta
This survey is about the analysis of 468 samples that aims to determine the structure and the diversity of the different group zooplanktonics in the 13 inshore stations in the bay of Tabounsou. They have been studied in succession during one year, that means the year 2014 (March, April, May, June, July, August, September, October, November, December) and 2015 (January, February). Most species are perennial and their maximal abundance is located to the season of rains, when the enrichments of the coasts make themselves through the presence of the terrigènes. The abundance of the zooplankton reached its peak during the rainy season (July) and the evolution coordinated of several species of zooplankton is confirmed by the specific wealth. The following species are considered constants because, they have been met in each of the 13 stations sampled: Paracalanus aculeatus; Eriphia spinifrons; Paracalanus scotti; Nannocalanus minor; Paracalanus parvu; Sagitta hispida; Sagitta friderici. In terms of biomasses the Mysidacés (2433,14mg/m3), and the chaétognathes (1768,38 mg/m3) form the dominant group. Of a station to the other the variations of the biomass can be explained by the presence of the larvas of shrimps of large size.[Full Text Article]