. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Rock River Watershed 47 the Winnebago County Forest Preserve District is acquiring many other native habitats, includ- ing several high qualir\' wetland sites and a number of prairie and wetland restoration projects; the Biological Stream Characterization rated much of the Sugar River as a Class "A" stream (unique aquatic resource) and rated the Pecatonica and several of its tributaries as a Class "
. Critical trends in Illinois ecosystems. Ecological assessment (Biology); Environmental impact analysis; Nature; Pollution; Conservation of natural resources; Environmental quality. Rock River Watershed 47 the Winnebago County Forest Preserve District is acquiring many other native habitats, includ- ing several high qualir\' wetland sites and a number of prairie and wetland restoration projects; the Biological Stream Characterization rated much of the Sugar River as a Class "A" stream (unique aquatic resource) and rated the Pecatonica and several of its tributaries as a Class "C" stream (moderate aquatic resource); two segments of area streams, for a total of miles, are recognized as Biologicall)- Significant because they support a high level of mussel and fish diversity; 15,144 acres have been designated a Resource Rich Area. defg. â A Cropland () W B Grassland () â C Upland forest () â D Urban/built-up () â E Bottomland forest () D F Non-forested wetlands () D G Water () Figure 33- Siigar-Peccitonicci rivers basin land cover Plant and animal life Thirt)'-three percent (850) of the state's native plant species occur in the area. Of these, 26 are state endangered (the eastern prairie fringed orchid is also federally threatened) and six are state threat- ened. Most of these rare species occur in the prairie and wetland communities, particularly the sand communities in the Sugar River drainage and the wetland habitats associated with the bog area in the Raccoon Creek drainage. At least 261 of the 299 bird species that regu- larly occur in the state can be found here. Because of the geographical position of the area and the rather diverse array of habitats, several species of birds either reach or are near the northern ( yellow-throated warbler, white' of activities. Threats Agriculture and urbanization ha\e changed the mosaic of forests, wetlands, savannas, and prairies that existed before European settl
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Keywords: ., bookauthorillinoisnaturalhistorysurveydivisi, booksubjectnature
