. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Only 41 shrub and vines stems were recorded from all the sites. Of these, 53% were invasive species, the .second lowest amount in the state. None of the species present seemed dense or a .serious threat at this tinic, lint more sites arc needed to determine their 200 300 Stems per hectare Figure 55- Number of invasive and non-invasive shrub and vine stems REGIONAL ASSESSMENTS Two regional assess
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Only 41 shrub and vines stems were recorded from all the sites. Of these, 53% were invasive species, the .second lowest amount in the state. None of the species present seemed dense or a .serious threat at this tinic, lint more sites arc needed to determine their 200 300 Stems per hectare Figure 55- Number of invasive and non-invasive shrub and vine stems REGIONAL ASSESSMENTS Two regional assessments have been completed for this area —for the Embarras River Basin and the Illinois Headwaters. Embarras River Basin The Embarras River is the second-largest Illinois tribu- tary (194 miles) of the Wabash River. Its basin comprises 2,440 square miles, with the northern half falling within the Bloomington Ridge Plain — hilly, morainal ground — and the southern half mostly within the Springfield Plain — a flat landscape. Dominated by agriculture, the basin has onl)' a minuscule amount of original high quality prairie left () and onl>' about 30% of the presettlement area of forest, and the amount that is old-growth is vanishingly small. However, 11% of wetlands remain, more than the statewide average. Other .significant features: • five state-designated nature preserves offer hill prairies, till plains, marsh, .sandstone outcrops, prairie-chicken habitat, cxjiosiires of Ice Age sediments, and wet-mesic I'loodplains; • well over half of the Embarnis Rivers main .stem — two sections totaling miles, the. 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. Office of Realty and Environmental Planning; Illinois. Natural History Survey Division; Critical Trends Assessment Program
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