. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 13. Open water zone of Volo Bog Nature Presence in Lake County. Volo Bog is the only Illinois bog retaining an open-water zone; all other Illinois bogs are at a more advanced stage oflakefill. Seep/Spring Fen Bog Swamp Marsh Sedge Meadow Wet Prairie Moist Sand Pond Margin (mud) Panne Open Lake & Pond Flatwoods Floodplain Forest Streamside Number of Species Figure 14. Number of threatened
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 13. Open water zone of Volo Bog Nature Presence in Lake County. Volo Bog is the only Illinois bog retaining an open-water zone; all other Illinois bogs are at a more advanced stage oflakefill. Seep/Spring Fen Bog Swamp Marsh Sedge Meadow Wet Prairie Moist Sand Pond Margin (mud) Panne Open Lake & Pond Flatwoods Floodplain Forest Streamside Number of Species Figure 14. Number of threatened and endangered species found in various types of wetlands in Illinois. In a seep, water generally flows out diffusely, occa- sionally collecting into concentrated spring runs, whereas groundwater in a spring emerges in a concen- trated form, often from a definite opening. The pH of the groundwater that emerges at a seep varies through- out the state, influenced by the type of substrate through which the water flows. The groundwater of most seeps is circumneutral or slightly calcareous (rich in calcium carbonates); some seeps are so calcareous that tufa deposits (precipitates from the highly mineral- ized groundwater) collect where the water emerges. Acid seeps are rare in Illinois. One acid seep occurs in. 100. 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 Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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