. Critical trends assessment program : keeping an eye on Illinois habitats. Critial trends assessment program; Habitat conservation. with European forage grasses. In the case of birds, refer- ence sites had greater species diversity than the randomly selected sites (Fig. 18). As patch size increases more bird species are found, including habitat and area dependent species (Fig. 19). Theses results are not surprising either, since many studies have shown that large tracts of grass- lands will sustain more grassland bird Prairie 1820 (10 million hectares) Agriculture 1999 Croplands Gra
. Critical trends assessment program : keeping an eye on Illinois habitats. Critial trends assessment program; Habitat conservation. with European forage grasses. In the case of birds, refer- ence sites had greater species diversity than the randomly selected sites (Fig. 18). As patch size increases more bird species are found, including habitat and area dependent species (Fig. 19). Theses results are not surprising either, since many studies have shown that large tracts of grass- lands will sustain more grassland bird Prairie 1820 (10 million hectares) Agriculture 1999 Croplands Grasslands 1999 Pastures, hayfields, roadsides, rights of way, etc Representative Current Prairie Acreage Remnant prairie (1,050 hectares) Figure 14. Changes in the Illinois landscape. CTAP Grassland Plant Species Richness S 45 E. 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. Natural History Survey Division; Illinois. Dept. of Natural Resources. Champaign, Ill. : Illinois Natural History Survey
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