Diversity of benthic macroinvertebrates and biotic indices to evaluate water quality in Lake Sokotè (Côte d’Ivoire)
Paper Details
Diversity of benthic macroinvertebrates and biotic indices to evaluate water quality in Lake Sokotè (Côte d’Ivoire)
Abstract
Aquatic environments provide many ecosystem services to human people and their management requires a good knowledge of ecological status and biodiversity. The present study aimed to determine the structure of benthic macroinvertebrate assemblage in relation to the physicochemical quality of Lake Sokotè, in Bongouanou City (Côte d’Ivoire). Physico-chemical parameters were measured monthly from May 2017 to April 2018 and the benthic macrofauna was collected using a Van Veen grab on a total area of about 0.5m2 per sample. Both macroinvertebrates and physico-chemical data were analysed according to seasonal variations and correlations. Physicochemical parameters analysis indicated low values of dissolved oxygen, pH and transparency and significant variations between the dry and rainy seasons (p<0.05). Thirty-five taxa of macroinvertebrate including annelids molluscs, insects and were identified in Lake Sokotè. Quantitative analysis of macroinvertebrate assemblage revealed that three families Tubificidae (annelids), Thiaridae (molluscs) and Chironomidae (insects) which are resistant taxa to pollution represent 95.34% of the total abundance. Number of taxa varied significantly according to seasons and diversity index were lower in all seasons. Diversity indices and physicochemical parameters revealed that Lake Sokotè is rich in organic matter and poor quality, and macroinvertebrates assemblages changed depending on seasonal variation of environmental variables.
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