Analysis of Ephemeroptera, Plecoptera and Trichoptera (EPT ...
sample of Guilford Creek, showing the abundance of various feeding groups of the EPT orders found. Genus richness for each feeding group is shown in parenthesis. Community Parameter II Biotic Index assigns water quality values as follows: < 40 = poor water quality, 4059 = fair, 6079 = good, and >79 = excellent water quality (Bode et al. 1997).