. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS Table 3. Amounts of various wetland types in Illinois (based on Illinois Wetlands Inventory classification; taken from Suloway et al. 1992). Habitat Acres Percentage of total land Percentage of Natural Modified/artificial wetlands Acres Percentage Acres Percentage 888,155 76 280,809 24 661,174 85 112,458 14 10,553 71 4,386 29 650,621 86 108,072 14 172,178 85 29,443 1
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS Table 3. Amounts of various wetland types in Illinois (based on Illinois Wetlands Inventory classification; taken from Suloway et al. 1992). Habitat Acres Percentage of total land Percentage of Natural Modified/artificial wetlands Acres Percentage Acres Percentage 888,155 76 280,809 24 661,174 85 112,458 14 10,553 71 4,386 29 650,621 86 108,072 14 172,178 85 29,443 15 146,873 90 16,040 10 25,305 65 13,403 35 16,402 11 126,944 89 38,401 76 11,964 24 10,307 19 45,261 81 9,354 18 42,514 82 422 14 86 531 69 240 31 19,302 66 10,057 34 3,802 96 164 4 15,500 61 9,892 39 Palustrine wetlands 1,168,964 Forested 773,632 Swamp 14,939 Bottomland forest 758,693 Emergent 201,621 Shallow marsh/ 162,913 wet meadow Deep marsh 38,708 Open water 143,345 Scrub-shrub 50,366 Lacustrine wetlands 55,568 Shallow lake 51,868 Shore 2,929 Emergent 772 Riverine wetlands 29,358 Perennial 3,967 Intermittent 25,392 Total wetlands 1,253,891 917,765 73 336,126 27. Figure 5. Distribution of total wetlands by quadrangle (1980-1987). Source: Suloway etal. 1992. Forested swamps, once common in the southern Midwest, are often dominated by bald cypress and water tupelo. The cypresses may reach prodigious size; in Illinois, the largest is more than 34 feet (11 m) in circumference. Cypresses are also among the oldest living organisms on earth. In southern Illinois, thousand-year-old specimens can still be found. The soil in forested swamps may be either organic or mineral but usually has a topmost organic layer underlain with a mineral soil. Shrub swamps are similar to forested swamps except that less of the vegetation is in the form of trees. Typical p
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