HUMAN PRESSURE AND ITS ENVIRONMENTAL EFFECTS ON THE ONUIMO REGION OF THE IMO RIVER

Abstract

This study assessed the impact of anthropogenic activities on water quality in the Onuimo section of the Imo River, southeastern Nigeria. Weekly water samples were collected over 12 weeks (May–July 2017) from four stations along the river. Parameters measured included temperature, transparency, pH, Total Dissolved Solids (TDS), Biological Oxygen Demand (BOD), Dissolved Oxygen (DO), and concentrations of heavy metals. Temperature showed no significant variation across stations except in May, while transparency varied significantly except in July. pH levels were consistent among stations in July. Station C exhibited significant differences in several parameters throughout the period, indicating localized anthropogenic impacts. Heavy metal levels did not significantly differ among stations, but overall data suggest pollution influences linked to human activities, particularly at Station C. The findings underscore the need for continuous monitoring and pollution control to protect the aquatic ecosystem and maintain sustainable water quality in the Imo River.