. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS Table 4. Estimates of historical (Soper and Osbon 1922) and contemporary (Soil Conservation Service 1993) acres of peat and muck in Illinois compared with the results of the Illinois Natural Areas Inventory (INAI) (White 1978). County Historical 1993 soil survey INAI Grades peat and muck Muck Peat AandB Boone NA1 3,557 0 0 Cook/DuPag 5 NA 10,341 0 22 DuPage 4,186 b 0 0 Kane 9,299 9,639 0 23
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS Table 4. Estimates of historical (Soper and Osbon 1922) and contemporary (Soil Conservation Service 1993) acres of peat and muck in Illinois compared with the results of the Illinois Natural Areas Inventory (INAI) (White 1978). County Historical 1993 soil survey INAI Grades peat and muck Muck Peat AandB Boone NA1 3,557 0 0 Cook/DuPag 5 NA 10,341 0 22 DuPage 4,186 b 0 0 Kane 9,299 9,639 0 23 Kankakee 1,747 1,707 0 0 Lake 24,384 17,122 465 286 Lee NA 999 0 0 Mason NA 1,046 0 0 McHenry NA 20,485 1,760 226 Tazewell 1,344 790 0 0 Whiteside 2,580" 3,455 0 0 Will NA 2,385 0 0 Winnebago 1,427 3,557 0 0 Woodford NA NA 0 5 Statewide 42,387 98,331 2,225 562 1 Not available. ' See Cook/Dupage : Peat acres only. many species any two sites share) among four Illinois peatlands (two bogs and two fens) and one Indiana bog being 45% (Table 6). These data suggest that any one of the sites is not representative of other sites and that protection of one or two sites is not adequate to preserve the diversity originally established in Illinois peatlands. Pannes. Pannes are interdunal swales restricted to the Lake Michigan lakeshore region where undeveloped portions remain (Figure 10), primarily Illinois Beach State Park and Illinois Dunes North in Lake County. The calcareous nature of the sand, derived from the dolomitic bedrock of the region (Willman 1971), creates an alkaline reaction in the seasonal ponds, and several species are specifically adapted to this habitat. A progression of species can be observed to develop throughout the growing season as the pond level diminishes, exposing pond margins. Several unusual species, including carnivorous bladderworts and species from the Atlantic coast, are found in or are restricted to pannes in Illinois. Seeps. Seeps are wetland commu
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