A bio- evaluation of the effects of anthropogenic activities around Oguta lake, south – east, Nigeria

Abstract

Oguta Lake serves for several beneficial human uses ranging from Agriculture sand dredging cassava fermentation and washing Despite these the Lake receives anthropogenic inputs from the recent channeling of the community waste through erosion which are capable of causing deteriorating effect on the biota and community at large Thus the need to assess the likely effects of these wastes using the Macro invertebratess assemblage to evaluate the habitat stability Bi monthly sampling of some physico chemical parameters and Macro invertebrates were carried out for three months Temperature range between oC Ammonia range between mg l and Dissolved oxygen range between mg l Chironomus sp recorded the highest percentage abundance of while Melanoides tuberculata Sympetrum sp and Atoperla sp have the least abundance Also Chironomus sp recorded the highest diversity index of while Mayfly nymph recorded the least evenness of The study revealed that all the physico chemical parameters measure were within the allowable limit for Aquaculture excepts pH plusmn Ammonia plusmn mg L and Total Suspended Solid plusmn mg L while the recorded low mean diversity index in the Macro invertebrates could be as a result of high suspended solid capable of lowering the dissolve oxygen and also cause destruction of the Macro invertebrates habitat thereby making the habitat unstable