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HYDRAQ
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Publications (37)
In Benin, most of urban wastewaters are discharged into rivers without any prior treatment. The objective of this study was to assess the effects of urban wastewater on the macroinvertebrate communities of the upper Ouémé River in Benin. To address this question, 30 stations located on five rivers were monitored in the dry and the wet seasons. For...
La présente étude a pour objectif d’évaluer la diversité et la structure du zooplancton dans la rivière Okpara. Le zooplancton de la rivière a été identifié et la structure de sa communauté évaluée dans neuf stations sélectionnées grâce à la richesse taxonomique, à la densité, à l’indice de diversité de Shannon et l’indice d’équitabilité de Piélou....
The objective of this study was to assess the diversity and structure of zooplankton in the Okpara River. The river's zooplankton were identified and their community structure assessed at nine selected stations using taxonomic richness, density, the Shannon diversity index and the Pielou equitability index. A total of 68 species of zooplankton were...
La présente étude a pour objectif d’évaluer l’impact des eaux usées industrielles sur la qualité de l’eau de la rivière Klou. Pour cela, des prélèvements d’eau ont été effectués avec une fréquence mensuelle sur des stations témoins et exposées. Les analyses physico-chimiques et le calcul de l’indice de Pollution Organique (IPO) ont été effectués. E...
The Okpara River, one of the most important tributaries of the Ouémé River, is under the influence of anthropogenic activities along its banks. Thus, a study was conducted from July to September 2019. The study aims to assess the impact of anthropogenic activities on the macroinvertebrate community of the Okpara River. Analyses of the physicochemic...
The Okpara River, one of the most important tributaries of the Ouémé River, is under the influence of anthropogenic activities along its banks. Thus, a study was conducted from July to September 2019. Objective. The study aims to assess the impact of anthropogenic activities on the macroinvertebrate community of the Okpara River. Methods. Analyses...
This study was designed to assess morphological changes between cultured and wild tilapia, Oreochromis niloticus (L.). Wild fish samples were obtained from fishermen operating in the waters of the vicinity of the province Parakou, Benin in November 2014, while the cultured samples were obtained from a fish farm in the municipality of Sô-Ava in the...
The goal of this study was to evaluate the impacts of various preservation methods on disparities in morphometric parameters while also providing correction factors to recalculate the original body dimensions when sampled fish are measured at a future date. In this study, adult samples of O. niloticus and C. gariepinus collected from the waters of...
To cope with the numerous consequences of stream
pollution caused by anthropogenic activities, it is necessary to
evaluate the water quality for sustainable management. The
present study aims to evaluate the water quality of the upper
reaches of the Ouémé River in Benin using biotic indices
based on benthic macroinvertebrates. Macroinvertebrat...
Asimetría bilateral en la masa y el tamaño de otolitos de dos especies de cíclidos capturados en el lago Ahémé y la laguna de Porto Novo (Benín, África Occidental) Se estudia la asimetría de la masa del otolito sacular en dos especies de peces cíclidos Sarotherodon melanotheron y Coptodon guineensis recolectadas del lago Ahémé y la laguna Porto-Nov...
Given the intensive use of pesticides, strong urbanization and population explosion, rivers have become a receptacle of solid and liquid waste causing ecotoxicological risk. This study aims to characterize the biodiversity of macroinvertebrates inthe Mékrou River in order to determine the parameters influencing their distribution. The physico-chemi...
The present study aims at making an inventory of the Affon River's macroinvertebrates. By means of a Suber net, they were sampled in low water in seven different stations along the river. We had thus possessed in the calculations of their occurrence frequency, the Simpson Index, the Shannon Biodiversity Index and the equitability of Piélou. Of the...
The decomposition of organic matter is a key process in the functioning of rivers. This organic matter is an important source of energy and nutrients in food webs. The objective of this work is to evaluate the degradation of the litter of three plant species in the water of the Okpara River. The degradation of the three leaves (Piliostigma thonning...
The preservation of water quality is a major challenge not only for the sustainable management of the environment but also for that of biodiversity because of the strong and increasing human pressures that are exerted there. In the process of bio-monitoring of our aquatic ecosystems, a study was conducted in the Affon River in Benin. The purpose of...
The purpose of this work is to study the macroinvertebrate community and the physico-chemical quality of Okpara dam water, in order to assess the impact of anthropogenic activities. Water sampling and macroinvertebrate sampling were conducted at eight stations along the dam. The organic load in the river and the organization of the macroinvertebrat...
During a recent investigation of the benthic macrofauna from coastal lagoons of southern Benin (Ahémé, Nokoué and Porto-Novo lagoons), a new species of the amphipod genus Quadrivisio Stebbing, 1907, Q. laleyei sp. nov. was collected by means of different quantitative and non-quantitative methods (plastic baskets, wooden artificial substrates, uproo...
La présente étude porte sur la perception du changement climatique par les pêcheurs de la Réserve de Biosphère de la Pendjari et les stratégies locales d'adaptation dans cette pêcherie. Les données d'enquête ont été obtenues grâce à la méthode de sondage par boule de neige puis ont été analysées à l'aide des logiciels R 3.5.0 et Sphinx 4.5. Une mod...
Climate change and human pressures are changing the global distribution and extent of intermittent rivers and ephemeral streams (IRES), which comprise half of the global river network area. IRES are characterized by periods of flow cessation, during which channel substrates accumulate and undergo physico‐chemical changes (preconditioning), and peri...
L'objectif de cet article est d'étudier la pollution organique de la rivière Okédama dans la commune de Parakou. Pour ce faire, huit sites de prélèvement ont été choisis le long de la rivière. L'échantillonnage et l'analyse des paramètres physico-chimiques ont été déterminés suivant les méthodes AFNOR. Le degré de pollution de la rivière a été défi...
The Affon River is one of the important rivers of the Ouémé River whose benthic diversity remained unknown. The present study aims to make the relationship between macroinvertebrates and physico-chemical parameters to access water quality of the Affon River. The measurement of physico-chemical
parameters (temperature, pH, conductivity, transparency...
Selection on morphological traits can vary across the range of species, inducing a mosaic of phenotypes across populations. Intraspecific morphological divergence had been demonstrated for many fish groups inhabiting environments with varying abiotic or biotic selective pressures. Such intraspecific phenotypic variation can have a strong influence...
Ce travail porte sur la structure et la diversité des macroinvertébrés benthiques de la partie supérieure du fleuve Ouémé. Les macroinvertébrés benthiques ont été échantillonnés selon le protocole de l’indice biologique global normalisé (IBGN), dans quatre (04) stations. La structure des communautés benthiques a été
étudiée grâce aux indices de Sh...
Ce travail porte sur la structure et la diversité des macroinvertébrés benthiques de la partie supérieure du fleuve Ouémé. Les macroinvertébrés benthiques ont été échantillonnés selon le protocole de l'indice biologique global normalisé (IBGN), dans quatre (04) stations. La structure des communautés benthiques a été étudiée grâce aux indices de Sha...
In this work, it was matter of determining the species characteristics of the delta of the Oueme through the illustration of their indicative value. Sampling was carried out in eight heterogeneous stations covering the periods of flood and low water. The various indices including that of biserial correlation IndVal (Indicator Value Index) and the c...
Relationships between fish weight and length, otolith length and fish length, and otolith weight and length were analysed in two cichlid fish species, Coptodonguineensis(Günther, 1862) and SarotherodonmelanotheronRüppell, 1852 (Perciformes, Cichlidae), collected in two lakes in southern Benin (western Africa). The analysis of covariance (ANCOVA) wa...
A study on the relationships between the physicochemical parameters and of the macroinvertebrates of the Lake Nokoué was carried out for the purpose of developing a biotic index of pollution. A total of 96 stations were prospected twice during the flooding and the dry seasons from September 2004 to February 2006. At each station, seven physicochemi...
Objectif : La présente étude a pour objectif de caractériser les paramètres physico-chimiques des eaux du delta de l’Ouémé au Bénin et de faire une évaluation du niveau de pollution organique à partir des paramètres déterminés.Méthodologie et résultats : Treize paramètres physico-chimiques ont été mesurés dans huit stations entre avril 2014 et mars...
Asymmetry analysis was carried out for three bilateral characters of two cichlid fish species, Sarotherodon melanotheron and Coptodon guineensis collected from two localities, Lake Ahémé and Porto-Novo lagoon, Republic of Bénin, West Africa. For both S. melanotheron and C. guineensis snout length (SL), eye diameter (ED) and number of scales on late...
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Between 2003 and 2006 the diets of 22 fish species, comprising approximately 90% of the Lake Nokoué fish biomass, were analysed. Macroinvertebrates dominated the diet of ten species, fishes were the preferential prey of six fish species, and detritus and phytoplankton dominated the diets of six others. Attempts were made to calculate the consumptio...
A study on the relationships between the physicochemical parameters and of the macroinvertebrates of the Lake Nokoué was carried out for the purpose of developing a biotic index of pollution. A total of 96 stations were prospected twice during the flooding and the dry seasons from September 2004 to February 2006. At each station, seven physicochemi...
Les invertébrés constituent l'un des compartiments souvent ignorés et mal connus mais joue un rôle essentiel dans le fonctionnement des écosystèmes aquatiques. Cette étude concerne la faune d'invertébrés d'une lagune ouest africaine : leur rôle dans le réseau trophique et leur utilisation pour évaluer l'état de santé du lac. Un inventaire de tous l...
Tilman. B-4000 Liège et Laboratoire de Démographie des Poissons et d'Aquaculture, 8 Chemin de la Justice. B 4500 Tihange Belgique. 3 Musée Royal de l'Afrique Centrale (MRAC), Laboratoire d'Ichtyologie, B -3080 Tervuren. Belgique. ABSTRACT. The abundance and distribution, length-weight, condition factor, diet and reproduction of Synodontis schall an...
