. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Ecosystem Monitoring Results 31 intolerant of pollution) present in a sample — higher index values indicate less organic pollution. EPT are most diverse in natural streams and decline with increasing watershed disturbance. EPT rich- ness ranged from zero to 17, suggesting that stream health ran the gamut from poor to excellent across the 59 sites sampled by CTAP scientists. Statewide, the average was EPT taxa
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Ecosystem Monitoring Results 31 intolerant of pollution) present in a sample — higher index values indicate less organic pollution. EPT are most diverse in natural streams and decline with increasing watershed disturbance. EPT rich- ness ranged from zero to 17, suggesting that stream health ran the gamut from poor to excellent across the 59 sites sampled by CTAP scientists. Statewide, the average was EPT taxa per stream, indicating that most streams were in only fair Figure 22. Distribution of EPT taxa richness, RiverWatch ISIS basins with the lowest EPT score (impl)'ing poorest condition) were the Kaskaskia and KankakeeA'ermilion watersheds. These are highly agricultural areas that offer extremely monotonous habitat for EPT species. Alternatively,the EmbarrasA'ermilion S.,Spoon,and Sangamon watersheds had the highest EPT richness (Fig. 21). The Rock River watershed was historically one of the richest for EPT species in the state. Currently, it supports less than the statewide average. The average EFF taxa richness at RiverWatch sites was , much lower than the CTAP average because RiverWatch collects only nine EPT taxa. RiverWatch EPT taxa richness reached a high of in 1999. although this followed a low of ^ in 1998; no clear trend is discernible. The Spoon, Big Muddy/Saline/Cache, Kankakee/Vermilion/ Mackinaw, and Embarras/Vermilion watersheds fared better than the average. At the opposite end of the spectrum were the Kaskaskia, Little Wabash, and Fox/l)es Plaines watersheds. Figure 22 shows the distribution of EP'F taxa richness for all KiverWatch .samples. 160 - 140 120 ; 100 1 i^ 80- I I T T d 1 I : T I p; I 3: 20 Figure 20. Distribution of ai'era^e habitat quality scores statewide and for 10 ISIS watersljeds Note: sqimres indicate the mean, t
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