. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 24 Critical Trends in Illinois Ecosystems Table 10. Introduced Species in CLAP Wetland Sites, by Region (number of sites monitored is in parentheses) Northern (22) Central (37) Southern (19) State CS) Species # sites # sites dominant # sites # sites dominant # sites # sites dominant # sites Meadow fescue Narrow-leaved cattail Reed canary grass Barnyard grass Common reed* 1 0 2 1 13 6 2 0 1 0 6 4 0 0 20 16 7 1 0 0
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. 24 Critical Trends in Illinois Ecosystems Table 10. Introduced Species in CLAP Wetland Sites, by Region (number of sites monitored is in parentheses) Northern (22) Central (37) Southern (19) State CS) Species # sites # sites dominant # sites # sites dominant # sites # sites dominant # sites Meadow fescue Narrow-leaved cattail Reed canary grass Barnyard grass Common reed* 1 0 2 1 13 6 2 0 1 0 6 4 0 0 20 16 7 1 0 0 2 5 5 6 5 0 0 2 0 5 9 38 15 6 â species locally native in Illinois, but becoming invasive out of its original range. site was two; those of greatest concern were several grasses and the narrow-leaved cattail (Table 10). Northern and central Illinois wetlands were most heavily dominated by reed canary grass and meadow fescue, while southern Illinois wetlands most often contained the common reed â an invasive native species. A higher percentage of introduced species were generally found at lower diversity sites. Where reed canary grass â the most commonly encoun- tered introduced species â was found it had replaced most native species, often nearly forming a monoculture. Reed canary grass was, in fact, the dominant species at 22 of the 78 sites sampled. While most Illinois wetlands have been altered, some monitored sites arc still diverse and contain a high proportion of native species, particularly in Southern Illinois (Fig. 16). Wetland Birds While many of the bird species that use wetlands are able to live in other habitats as well ( red- winged blackbird), the 31 species listed in Table 11 are dependent on wetlands and their presence serves as an indicator of wetland conditions. Although at least 15 wetland-dependent species occur in southern Illinois and at least 27. Please note that these images are extracted from scanned page images that may have been digitally enh
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