The qualitative similarity among macroinvertebrates at all
the four sites fluctuated from 81.8 to 92.6% throughout the
study period (Table 4). The highest similarity index between S1
and S4 (92.6%) is an indication of similar environmental
conditions at these sites. The density and diversity of
macroinvertebrates were also recorded similar in these sites.
According to Mastrantuono and Mancinelli (2003, 2005), the
highest value of similarity index between two sites shows
their connectivity of the same environmental conditions at
these sites. Lowest value of similarity index was observed
between S1 and S3, which is an indication of the differences in
environmental conditions between these sites. The site S3
showed a minimum similarity with other sites.