Seasonal variation, distribution and interrelationships of rotifers in Opa Reservoir, Nigeria

The seasonal variations, spatial distribution and interrelationships of rotifers in Opa Reservoir, Nigeria were studied and the relationship between rotifer species and certain physico-chemical parameters of the water described. The population density of rotifers was maximal during the rainy season, mostly concentrated at the top of the water column. Rotifer communities in the riverine source station were different from the open lake communities and rotifer population density was poorest in the riverine section. Significant correlations were found between rotifers and several physico-chemical parameters of which oxygen was the most pronounced. Considerable affinity and close associations were also found to exist between rotifer species.