. Bulletin. Natural History; Natural History. September 1943 Braun & Amp; Yeager: Befragung von Pelz Ressource 441 wicklung von umfangreichen Bottomlands. Scat-ten sind durchweg bewaldeten Kalksteinfelsen, häufig durch Blue-Gras Hängen umgeben. Obwohl gemeinsame Überweidung ist, Weidemanagement ist fair in vielen Fällen. Die Kultivierung ist begrenzt. Vergleichsweise w^ell bewachsene Böden ihre Wasser langsam freigeben, die Anlass zu zahlrei-kleine, klare Bäche. Die Entwaldung hat etwas weniger schnell als in den meisten anderen Orten in Illinois, MAK-ing für Relativ gute wildlife Abdeckung ov Fortgeschritten

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. Bulletin. Natural history; Natural history. September, 1943 Brown & Yeager: Survey of Fur Resource 441 velopment of extensive bottomlands. Scat- tered throughout are wooded limestone outcrops, frequently surrounded by blue- grass slopes. Although overgrazing is common, pasture management is fair in many instances. Cultivation is limited. Comparatively w^ell vegetated soils release their waters slowly, giving rise to numer- ous small, clear streams. Deforestation has progressed somewhat less rapidly here than in most other places in Illinois, mak- ing for relatively good wildlife cover over much of the region. Western Prairie.—This is a fertile, rather low^ prairie area of 3, 244 square miles, fig. 2. The western border is the Mississippi River, along which there is local development of bluffs and bottom- land. Here, the prairie seemingly flows into the river at many points. Streams are small, and enough of them are intermit- tent to impair the quality of otherwise good muskrat and mink habitats. Woody cover is generally lacking. River Bluffs and Bottoms.—-As a fur animal habitat this survey region, the only one not continuous, is perhaps the most interesting in the state, fig. 2. It contains 11, 251 square miles, being ex- ceeded in size only by the black prairie and gray prairie areas. This region, figs. 6, 18, 22, 24, 26, 27, 28, 29 and 30, deter- mined largely on the bases of drainage and topography, contains three main subtypes characterized, respectively, by (1) three large rivers, all fluctuating in nature; (2) broken slopes or bluffs, which may be forested or partly cleared, and often pas- tured, leading down to bottomland; and (3) bottomland, timbered or cleared, often pastured and, in addition, often leveed. In all cases the bluffs are of limestone in varying stages of exposure and weather- ing. The region extends nearly the full north-south length of the state along the Mississippi River and through a number of counties along the southern half of t

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• booka
• bookcentury1900
• bookdecade1910
• booksubjectnaturalhistory