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-1 upstream to 0.04 mg·L -1 downstream. Ammonia nitrogen (NH 3 -N) concentration was 0.51 mg·L -1 upstream and 0.86 mg·L 1 downstream. Nitrate concentration stood at 1.18 mg·L -1 upstream compared with the 2.23 mg·L -1 downstream. The pH changed from 4.5 to 5.0 upstream to 5.5 to 6.0 downstream, while DO increased from 6.57 to 7.03 mg·L -1 downstream. The BOD 5 (biochemical oxygen demand after fi ve days) values remained almost unchanged from 4.63 mg·L -1 upstream to 4.67 mg·L -1 downstream. Taxon composition of phytoplankton and macroinvertebrates correlated with adverse environmental gradients resulting from the mill’s effl uent discharge. Overall, there was a shift in composition and abundance of both phytoplankton and macroinvertebrates, with the downstream site recording high numbers of tolerant taxa (i.e., Microcystis sp. and Chironomus sp.). It was recommended that water quality monitoring with effl uents of this nature be done using a combination of chemical analysis and biological indicators such as phytoplankton and macroinvertebrates.

Impact of a Kraft Pulp and Paper Mill Effluent on Phytoplankton and Macroinvertebrates in River Nzoia, Kenya