Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 07, Issue 3, 2005; Page No.(343-349)

A PRELIMINARY INVESTIGATION OF THE ENTOMOLOGICAL INDICATORS OF BIOLOGICAL INTEGRITY AND NUTRIENT STRENGTH IN ERILOPE STREAM AGO-IWOYE, SOUTHWESTERN NIGERIA

A.D. BANJO, O.A. LAWAL AND B.U. ELELE

Abstract

The biological integrity and nutrient strength at five sites in Erilope stream was studied using insects and the physico-chemical analysis of the stream as indicators between June and October 2003. The total number of insect sampled was 204, which belonged to four Orders and seven different Families. There was no significant difference in the abundance of Dystiscid beetle, black fly and water spider at the five site (P5_0.05). There was significant difference in the abundance of Dragon/Damsel fly, Pond skater and whirligig beetle for the five different sites (P5_0.05). The site D of the stream showed the highest representation of all insect sampled. The mean value of the physico-chemical analysis of the stream for the five different sites showed no significant level of difference. The least significant difference (LSD) of the abundance of insect showed that sites A, B and C were not conducive for the insects sampled. The correlation coefficient indicated a strong relationship between the number of individual of Dragon/Damsel fly, Dystiscid and whirligig beetle and the Magnesium content and Chemical Oxygen Demand (COD) of the stream, the pond skater and water correlated negatively with the Nitrogen content and Temperature of the stream. Based on these finding the water body was considered a highly polluted ecosystem whose pollution resulted majorly from anthropogenic activities (dumping of refuse, defecation and discharge of different waste into the stream).

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