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From January 2016 to May 2017, C. suchus from two sacred ponds in the villages of Bazoule and Sabou were monitored. The objective of this study was to highlight the local perceptions and beliefs of the populations, then capitalize on endogenous conservation measures. The local attitudes, beliefs and perceptions of the population about the crocodile were studied using an ethno-zoological approach based on interviews using a questionnaire. Diurnal and nocturnal inventories have been conducted to determine the crocodile population structure. The results of this study suggest that traditional beliefs play a very important role in the protection and conservation of C. suchus in Bazoule and Sabou villages. A total of 268 crocodile individuals have been counted in Bazoule: 25% of hatchlings; 17% of juveniles; 12% of subadults and 10% of adults. In Sabou out of a total of 249 individuals counted, 22% are hatchlings; 12% juveniles; 12% of sub-adults and 14% of adults. Despite traditional perceptions and beliefs that provide some protection for crocodiles in these ponds, pressures from anthropogenic activities could influence their abundance. De janvier 2016 a mai 2017, C. suchus de deux mares sacrees des villages de Bazoule et de Sabou ont fait l’objet d’un suivi. L’objectif etait de mettre en evidence les perceptions et les croyances locales des populations, puis capitaliser les mesures de conservation endogenes. Les attitudes, les croyances et les perceptions locales des populations sur le crocodile ont ete etudiees a partir d’une approche ethno-zoologique basee sur des interviews a l’aide d’un questionnaire. Des inventaires diurnes et nocturnes ont ete conduits afin de determiner la structure de la population de crocodiles. Les resultats de cette etude suggerent que les croyances traditionnelles jouent un role tres important dans la protection et la conservation de C. suchus dans les villages de Bazoule et Sabou. Un total de 268 individus de crocodiles a ete denombre a Bazoule dont 25% de nouveau-nes ; 17% de juveniles ; 12% de subadultes et 10% d’adultes. A Sabou sur un total de 249 individus denombres, 22% sont des nouveau-nes ; 12% des juveniles ; 12% des subadultes et 14% des adultes. Malgre les perceptions et les croyances traditionnelles qui assurent une certaine protection des crocodiles dans ces mares, des pressions dues aux activites anthropiques pourraient influencer leur abondance.

The urban reservoirs n° 2 and n°3 of Ouagadougou, located in the middle of the city are subject to multiple anthropogenic pressures which threaten the diversity of benthic macroinvertebrates community group like molluscs. This study was initiated to assess the diversity and distribution of benthic molluscs in these reservoirs. Molluscs samples were collected monthly using an Eckman grab (12 x 20 cm2) between September 2011 and February 2012 in 24 sampling points defined on each reservoir. In parallel, physicochemical variables and water colon depth were measured. After sampling, molluscs were transported to the laboratory for identification. A total of 328 specimens were collected of which 5 species were identified: three species of Gastropods (Bellamya unicolor, Cleopatra bulimoides, Lanistes ovum) and two species of Bivalves (Coelatura aegyptiaca, Mutela rostrata). B. unicolor was the most abundant species with 71% of the collected molluscs and preferentially occupied the edges of the reservoir. It was followed by C. aegyptiaca (27%) which was abundant in the central axis of the reservoir. Physicochemical variables influence the distribution of species. For all measured physicochemical factors, B. unicolor was more tolerant than C. aegyptiaca on the occupation of available habitat.© 2015 International Formulae Group. All rights reserved.Keywords: Bivalves, Gastropods, available habitat, physicochemical variables, anthropogenic pressures