. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Embarras and Vermilion Rivers Watershed 89 forests and one ash-elm-maple bottomland forest. Tree species richness ranged from seven to l6 species, with an average of 12 tree species per site, similar to the statewide average of species. A total of 34 tree taxa were recorded. Two sites showed some sign of maple takeover, with one of these having a few large sugar maples. Table 44. Tree Species with the Highest
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Embarras and Vermilion Rivers Watershed 89 forests and one ash-elm-maple bottomland forest. Tree species richness ranged from seven to l6 species, with an average of 12 tree species per site, similar to the statewide average of species. A total of 34 tree taxa were recorded. Two sites showed some sign of maple takeover, with one of these having a few large sugar maples. Table 44. Tree Species with the Highest Importance Values Non-invasrve vines Non-invasive shrubs Importance Value Species % of total trees counted (n=616) % of total basal area (^Aia) Hickor)- 29",, 20"„ Red oak 9% 14% Sugar maple ;.. 16% White oak 8",. 8".. White oak group 3% 10% Ash 4% 5% Oak species 3% 5% Slippcn elm 6% 2% Flowering dogwood 6% 1% Pin oak 1% 6% There were no signs of g)'psy moths, but two sites had evidence of dogwood anthracnose. At one of these sites, nearly all of the dogwood trees showed symptoms of the disease. It is likely that more areas within the watershed have anthracnose since flowering dogwoods are relatively common and the disease is becoming 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 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. Springfield, Ill. : Offic
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