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Water clarity in the Orange River of South Africa alternates between highly turbid and clearer conditions. Multiple ecological effects result from this that affect aquatic community structure and species composition, including switching of dominant black fly species and growth of benthic algae. Fourteen sites in the middle and lower Orange River were sampled for black fly species and abundances, presence of benthic algae, water quality and turbidity seasonally between November 2015 and Decemberdoi:10.1139/cjz-2017-0285 fatcat:o5oq2znbpjbltpxvpxwbn3hbkm