. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 31. Number of threatened and endangered wetland plant species known from extant poulations in each Illinois county. Despite a steady increase in the amount of time and money spent on control, the spread of these non-natives has continued (Francis M. Harty, Illinois Department of Conservation, personal communication). The two most important non-native speciesthat seriously affect wetland habit
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 31. Number of threatened and endangered wetland plant species known from extant poulations in each Illinois county. Despite a steady increase in the amount of time and money spent on control, the spread of these non-natives has continued (Francis M. Harty, Illinois Department of Conservation, personal communication). The two most important non-native speciesthat seriously affect wetland habitats are purple loosestrife and glossy buckthorn. Purple loosestrife is a wetland plant from northern Europe, where it occurs in scat- tered locations in marshes and sea shores. Seeds of purple loosestrife probably arrived in North America in the early 1800s in ship ballast (Thompson et al. 1987). In the absence of natural predators and competitors in the New World, the plant spread rapidly in the north- eastern United States during the 19th century, mainly along commercial shipping routes. By 1980, purple loosestrife had become firmly established in wetlands in the eastern United States and had spread to the West Coast (Schwegman 1985, Thompson et al. 1987). Once established in wetland habitats such as bogs, marshes, fens, and sedge meadows, and along reservoirs and ditches, the plants spread rapidly and displaced native. Figure 32. Number of extirpations of threatened and endangered wetland plant species in each Illinois county. 110. 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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