9304

• UCREFRP Catalog Number: 9304
• Author: Mueller, G., L. Boobar, R. Wydoski and K. Comella.
• Title: Aquatic Survey of the Lower Escalante River, Glen Canyon National Recreation Area, Utah; June 22-26, 1998.
• USFW Year: 1998.
• USFW - Doc Type: \
• Copyright Material: NO

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Table 1.2. Community summary statistics. Abundance data is number per meter squared for quantitative
samples and number per sample for qualitative samples. EPT = totals for the insect orders,
Ephemeroptera. Plecoptera,Trichoptera. MHBI = Modified Hilsenhoff Biotic Index.
In site descriptor, QL = qualitative and QN = quanitative samples.
AssemblaQe Abundance Measures
Total EPT2 #of Dominant Dom. Family Dom. Family
Site Date Sample 10' abundance abundance families family abundance % contribution
Upper-OL 6/23/98 106721 35 27 8 Tricorythidae 9 25.71
Upper.ON 6/22/98 106722 81 43 11 Simliidae 24 29.63
Lower-QN 6/24/98 106723 161 132 8 Hydrosychidae 71 44.1
Lower-OL 6/24198 106724 198 66 10 Chironomidae 119 60.1
Diversity Indices
Total EPT
taxa taxa Shannon Simpson
richness richness diversity diversity Evenness
Upper.OL 6/23/98 106721 8 4 1.851 0.159 0.983
Upper.QN 6/22/98 106722 13 4 2.023 0.161 0.792
Lower.QN 6/24198 106723 10 6 1.573 0.277 0.685
Lower-OL 6/24/98 106724 11 6 1.44 0.385 0.495
Biotic Indices
USFS
Biotic Condition Index.
MHBI3 Indication CTOa CTCd
Upper.QL 6/23198 106721 2.61 Slight organic enrichment 89 87
Upper.ON 6/22198 106722 4.06 Moderate organic enrichment 96 94
Lower.QN 6124198 106723 3.97 Slight organic enrichment 89 96
Lower.OL 6/24198 106724 4.93 Moderate organic enrichment 95 100

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1. Allows cross referencing to Bureau of Land Management and U.S. Forest Service National Aquatic
Monitoring Center Database.
2. Ephemeroptera, Plecoptera. Trichoptera - ratio considered sensitive to pollution.
3. Modified Hilsenhoff Biotic Index - summarizes the overall pollution tolerances of the taxa collected.
4. Community toerant quotient - integrates biological, physical and chemical parameters.

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