ror.org/025wndx93
Abstracts
Abstract
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. Macroinvertebrates were sampled using a Surber net in four stations distributed over the longitudinal profile of the upper reaches of the Ouémé River. After sample collection, the macroinvertebrates were separated, identified and counted under a stereo-microscope. A total of 13 macroinvertebrate orders and 24 macroinvertebrate families were collected in this study. The Chironomidae was the most abundant family. The results of the Ephemeroptera, Plecoptera, Trichoptera (EPT) Index, the EPT/Chironomidae Index, the Hilsenhoff Index and the Standardized Global Biological Index (IBGN) revealed that the Upper Ouémé River has very poor water quality. The intense pressures from human activities in this part of the river have led to serious organic pollution, which has resulted in the proliferation of macroinvertebrates resistant to pollution to the detriment of those sensitive to pollution. On the basis of this result, protection and recovery measures must be taken to preserve and improve the ecological status of the waters of the upper reaches of the Ouémé River.
Key words:
- macroinvertebrates,
- biotic indices,
- water quality,
- pollution,
- Ouémé River
Résumé
Face aux innombrables conséquences de la pollution des cours d’eau par les activités anthropiques, il est nécessaire d’évaluer leur qualité pour une gestion durable. La présente étude vise à évaluer la qualité de l’eau de la partie supérieure du fleuve Ouémé au Bénin à l’aide d’indices biotiques. Au moyen d’un filet Surber, les macroinvertébrés ont été échantillonnés dans quatre stations réparties sur le profil longitudinal de la partie supérieure du fleuve Ouémé. Après la collecte, les macroinvertébrés ont été triés, identifiés et comptés sous une loupe. Au total, 13 ordres et 24 familles de macroinvertébrés ont été capturés dans cette étude. La famille des Chironomidae était la plus abondante. Les résultats de l’indice EPT (éphéméroptères, plécoptères, trichoptères), de l’indice EPT/Chironomidae, de l’indice Hilsenhoff et de l’Indice biologique global normalisé (IBGN) ont révélé que les eaux de la partie supérieure du fleuve Ouémé sont d’une très mauvaise qualité. Les intenses activités humaines dans cette partie du fleuve Ouémé ont entrainé une pollution organique grave, qui a pour conséquence une prolifération des macroinvertébrés polluo-résistants au détriment des polluo-sensibles. Partant de ce fait, des mesures de protection et de récupération doivent être prises afin de préserver et d'améliorer l'état écologique des eaux de la partie supérieure du fleuve Ouémé.
Mots-clés:
- macroinvertébrés,
- indices biotiques,
- qualité de l’eau,
- pollution,
- fleuve Ouémé
Appendices
References
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