. Critical Trends Assessment Program : 2001 report. Ecosystem management; Environmental monitoring; Natural resources surveys. Fig. 2. Mean and standard error of EPT taxa richness for CTAP streams. Abbreviations not obvious above are E-V = Embarras/Vermilion S, SANG = Sangamon, LAM = La Moine, LWAB = Little Wabash, M-S-C = Big Muddy/ Saline/Cache, K-V-M = KankakeeA^ermilion N/Mackinaw, KASK = Kaskaskia. Number in bars indicate sample size. HBI averaged statewide, indicating that streams were moderately impacted by organic enrichment (Figure 3). As a reminder, this index increases with grea
. Critical Trends Assessment Program : 2001 report. Ecosystem management; Environmental monitoring; Natural resources surveys. Fig. 2. Mean and standard error of EPT taxa richness for CTAP streams. Abbreviations not obvious above are E-V = Embarras/Vermilion S, SANG = Sangamon, LAM = La Moine, LWAB = Little Wabash, M-S-C = Big Muddy/ Saline/Cache, K-V-M = KankakeeA^ermilion N/Mackinaw, KASK = Kaskaskia. Number in bars indicate sample size. HBI averaged statewide, indicating that streams were moderately impacted by organic enrichment (Figure 3). As a reminder, this index increases with greater organic enrichment and poorer stream quality. The Rock River basin had the highest average HBI of all groupings, which indicated that it was the most organically enriched. This basin has more cattle grazing than most other basins in the state, which contributes organic material to rivers through runoff. This is especially evident in many of the smaller streams of the region. Larimore and Bay ley (1996) suggested that organic enrichment of streams in Champaign County had decreased since its zenith in the 1940s - 1960s. The change from livestock- based to grain-based agriculture and the installation of better wastewater treatment facilities has drastically reduced organic wastes entering streams in the county. This trend has presumably occurred in similar areas of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Natural Resources; Illinois. Office of Realty and Environmental Planning; Illinois. Natural History Survey Division; Critical Trends Assessment Project. Springfield, Ill. : Illinois Dept. of Natural Resources
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