Abstract
Monthly and Seasonal regimes in the physico-chemical status of Mfangmfang pond, Uyo, Nigeria, were studied. Meteorological conditions depicted a short dry (November-February) and a prolonged wet (March-October) season. From the trends in hydrological variables, it was inferred that the integrated impact of precipita-tion, changes in pond level, input of surface runoff and municipal effluents played an overriding role in determining the absolute levels and temporal patterns in the water quality attributes. The physico-chemical parameters were assigned to three cate-gories according to the types of seasonal and anthropogenic influences:
(1) Dry-season maximum (transparency, dissolved oxygen, free CO2 nitrate-nitrogen), resulting from low precipitation with concomitant reductions in input of surface runoff/municipal effluents and pond level.
(2) Wet-season maximum (suspended solids, conductivity, phosphate-phosphorus), resulting from increased precipitation with concomitant increases in the input of surface runoff/municipal effluents and pond level.
(3) No substantial seasonality (surface temperature, pH, total alkalinity) due to absence of significant influences of the wet-dry season cycle and surface runoff/municipal effluents.
