. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 60 Critical Trends in Illinois Ecosystems Table 22. Watershed Land Cover Land Cover Acres Percent of Watershed Statewide Percent^e* Upland forest 180,296 (9) Grassland 573,891 (7) Non-forested wetlands 29,806 (6) Bottomland forest 38,138 (10) Water 41,048 (7) Urban/built-up 101,313 (6) Cropland 2,972,847 (2) Total acreage 3,937,343 (9) (6) (6) 4A% (9)
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 60 Critical Trends in Illinois Ecosystems Table 22. Watershed Land Cover Land Cover Acres Percent of Watershed Statewide Percent^e* Upland forest 180,296 (9) Grassland 573,891 (7) Non-forested wetlands 29,806 (6) Bottomland forest 38,138 (10) Water 41,048 (7) Urban/built-up 101,313 (6) Cropland 2,972,847 (2) Total acreage 3,937,343 (9) (6) (6) 4A% (9) (6) (5) (1) (4) * The watershed's percentage of the land cover type statewide, of the state's upland forests are located in this watershed. Note: the watershed rank (Ist-lOth) is shown in parentheses. Statistical analysis indicates improving stream quality with the MBl falling from to species. The worst stream was Rock Creek near Carlock. It provided no EFT taxa, had low dissolved oxygen, and scored poorly for habitat quaUty. RiverWatch volunteers collected 71 macroin- vertebrate samples at 40 sites on 28 streams between 1995 and 1999. The sites selected by volunteers were of a higher quality than those randomly selected by CTAP scientists. Overall, the RiverWatch data showed better-than-average ecosystem health; the watershed fared particularly well in measures of taxa tolerance, suggesting that organic pollution is relatively minor The watershed. H CTAP-INHS River Sites ® RiverWatch Sites A ForestWatch Sites ranked second in number of EFT taxa and third in average MBI. With respect to macroinvertebrate diversity; the three most common species accounted for an average of of the sample. The watershed's average of t;ixa per sample ranked fourtli among the 10 watersheds. The three most dominant taxa collected were midge larA-ae. scud, and hydropsychid caddisfl)- larvae (an EFT species, albeit a common and moderately pollution-toleran
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