. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS 3 > c 0) J3 £ 3 10000 8000 6000- 4000- 2000-. 1983 1984 1985 1986 1987 1988 1989 1990 1991 Year Figure 45. Number of individuals of five colonial bird species that use Illinois wetlands, 1983 to 1991 (GBH = great blue heron, GE = great egret, LBH = little blue heron, BCNH = black crowned night-heron, DCC = double-crested cormorant). E z. Please note that these images are extracted from s
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. WETLANDS 3 > c 0) J3 £ 3 10000 8000 6000- 4000- 2000-. 1983 1984 1985 1986 1987 1988 1989 1990 1991 Year Figure 45. Number of individuals of five colonial bird species that use Illinois wetlands, 1983 to 1991 (GBH = great blue heron, GE = great egret, LBH = little blue heron, BCNH = black crowned night-heron, DCC = double-crested cormorant). E z. 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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