. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Kaskaskia River Watershed 83 centimeters in diameter, about eight times the num- ber of smaller hickories. No oaks were found that were less than 5 centimeters. Table 40. Tree Species with the Highest Importance Values Importance Value Species % of total trees coimted (n=l,198) % of total basal area () White oak 9% 24% Slippery elm 17% 8% Hickor)' 12% 9% Ash 7% 10% Hackberry 11% 5
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Kaskaskia River Watershed 83 centimeters in diameter, about eight times the num- ber of smaller hickories. No oaks were found that were less than 5 centimeters. Table 40. Tree Species with the Highest Importance Values Importance Value Species % of total trees coimted (n=l,198) % of total basal area () White oak 9% 24% Slippery elm 17% 8% Hickor)' 12% 9% Ash 7% 10% Hackberry 11% 5% Box elder 6% 2% Red oak 2% 6% Black walnut 3% 3% Sugar maple 3% 2% Pin oak 1% 4% There were no signs of gypsy moths, but one site showed evidence of dogwood anthracnose and another site showed possible anthracnose. This disease is becoming widespread in the state, and since flowering dogwood is a common species in the southern half of Illinois, it is likely that dogwood anthracnose is present in other forests in the watershed. Non-invasive vines Non-invasive shrubs Japanese honeysuckle Gooseberry MultHlora rose Honeysuckle 1 â Kaskaskia â Statewide 1 ^ ^â ^^ - . â -W" 1 ^^ â ^i^^"r ^^^ Buckthorn Cranberry II 0 100 200 300 400 500 Slams (Mr hectare Figure 52. Number of iuvasit'c and non-invasive shrub and vine stems About 70% of the 688 shnib and \inc stems recorded were from invasive species, mostly honeysuckle shrub and multiflora rose. Of the 10 watersiicds, the Kaskaskia watershed recorded the second-highest abundance of honeysuckle. I'lie watershed also recorded more than 7()"ii (of 34 stems) of the Japanese honeysuckle found statewide. Additional monitoring will help delineate how widespread this species is. Spring monitoring at three sites recorded only two disturbance-sensitive ground cover species, maidenhair fern and Virginia spiderwort, both found at the same site. REGIONAL ASSESSMENTS One regional assessment has been complete
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