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The spatial variation in the physico-chemical variables and macrobenthicinvertebrates assemblage of a stretch of Ethiope River, Nigeria were evaluatedfor 6 months at five study stations. The results showed that temperature,dissolved oxygen and bicarbonates were similar across the study stations. Thehighest values of conductivity and total dissolved solids were recorded atstation 1. The physico-chemical variables showed no significant different (P <0.05) in the study stations. The abundance of the macrobenthic invertebratescomprises 61 taxa in 34 families, and the highest and least values occurred atstations 3 and 1 respectively. The Diptera which accounted for 52.77% of theoverall abundance was the dominant group encountered, while the Decapoda(10.97%) which was prevalent in station 1 and the Ephemeroptera (8.05%) whichwas common in stations 2, 3 and 4 constituted the subdominant group. Over 68%of the oligochaetes recorded were restricted to station 3 except Dero limnosaand Nais sp that occurred in all the study stations. The overall abundance ofthe macrobenthic invertebrates was not significantly different (p < 0.05) amongthe study stations. Based on the canonical correspondence analyses, totaldissolved solids, biochemical oxygen demand, bicarbonates and pH influenced themacrobenthic invertebrate assemblage. The study stretch of Ethiope River wasreasonably free from gross pollution as indicated by the presence ofEphemeroptera, Tricoptera, Odonata and Decapoda at the study sites. However,there were indications of organic contamination as shown by the preponderanceof naidid oligochaetes and certain dipteran species including the chironomids.This study revealed a high diversity of macrobenthic invertebrates, and thiswas attributed to the relative spatial homogeneity of the physico-chemicalvariables recorded at the study stations.

Spatial Variations in the Physico-chemical Variables and Macrobenthic Invertebrate Assemblage of a Tropical River in Nigeria