Abstract:
The study was done for four months (August-November, 2006) usmg the
biomonitoring approach based on aquatic insects in relation to water physico
chemical parameters to assess, classify and compare the water quality of Sungai Peres
and Sungai Bubu. A total of 3409 individuals of aquatic insects representing 42
families from nine orders were collected using disturbance-removal sampling
technique. The total number of aquatic individuals did not differ significantly between
two streams but showed a higher abundance at the upstreams (Z = -2.519, P = 0.012)
compared to downstreams. The Ephemeroptera, Plecoptera, Trichoptera (EPT) Index
and EPT to Chironornidae ratio (EPT:C) showed that the pollution-sensitive EPT
were present in high diversity and abundance, especially at the upstreams, while the
distribution of resistant Chironomidae was higher at downstreams.
