A study of physico-chemical water quality and caddisfly larvae abundance in Opa Reservoir Stream, South-Western Nigeria

Resumen

This research was carried out at Opa Reservoir Stream in
Ile-Ife, Nigeria, between 2004-2005. The study investigated the
physico-chemical water quality and abundance of caddisfly larvae in
the stream. The larvae were found to be unprecedentedly abundant
when compared with other aquatic insects inhabiting the three
stations selected at the stream. Hence the study focused on
physicochemical parameters of the stream in relation to the
abundance of caddisfly larvae. The sampling stations (Stations A, B
and C) selected were based on the streambed morphology. Water
samples were collected and analysed to determine the
physicochemical characteristic of the stream. Samples of larvae were
also collected and identified to the lowest taxonomic level. Only two
species of caddisfly in different biotopes occurred at the three
stations; Cheumatopsyche digitata larvae were found at Station A
and Macrostemum alienum larvae inhabit both stations B and C.
Data collected were analysed using relevant inferential statistics
which include descriptive statistics and Pearson correlation
coefficient. There was fairly high positive non-significant
relationship between DO and abundance of C. digitata (r = 0.55) in
Station A, while in Stations B and C, there was a positive significant
relationship between DO and M. alienum larvae. This implies that
the high concentration of DO favours the abundance of M. alienum
than C. digittata larvae, which implies that C. digitata tolerate lower
DO concentration than M. alienum. There was negative non
significant correlation between the two species at the three stations
and chloride ion in the stream which suggest that the caddisfly
species is not favourly disposed to high concentration of chloride ion
at the stream. In conclusion since the stream accommodate caddisfly
species which have low tolerant level for pollution, it is can
therefore inferred as uncontaminated water.

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