Table Wq04: Water quality designations based on invertebrate insect population data for Missouri streams

Table Wq04: Water quality designations based on invertebrate insect population data for Missouri streams as used by Duchrow (1977).
Water Quality Designation Seasonal Annual Total Taxa
Species Diversity Index Value1 # of Mayfly & Stonefly Taxa Species Diversity Index Value1 # of Mayfly & Stonefly Taxa
Unpolluted >3.9 >9 >6.9 >21 >56
Moderately Polluted 2.2-3.9 5-9 3.8-6.9 10-21 31-56
Polluted <2.2 <5 <3.8 <10 <31

1Species Diversity Index Value=D= (s-1)/(logeN); where "s" equals the number of taxa and "N" is the total number of organisms in the sample.

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