An associational study of Illinois sand prairie . th plants and animals. General Note on the Prairie ProvinceThe prairie province, in the border of which the present regionis located, occupies a large inland area oast of the Rocky Ivlountains;it is characterized by the dry continental type of climate resultingfrom its geographic position. The moisture from the Pacific Ocean isintercepted by the cold peaks of the rookies, and so the precipitationis slight, increasing, hov/ever, toward the east. As the proportionof rainfall is higher in the growing season, a grassland type ofvegetation is favore
An associational study of Illinois sand prairie . th plants and animals. General Note on the Prairie ProvinceThe prairie province, in the border of which the present regionis located, occupies a large inland area oast of the Rocky Ivlountains;it is characterized by the dry continental type of climate resultingfrom its geographic position. The moisture from the Pacific Ocean isintercepted by the cold peaks of the rookies, and so the precipitationis slight, increasing, hov/ever, toward the east. As the proportionof rainfall is higher in the growing season, a grassland type ofvegetation is favored (Schimper, 1903: 175). As the rainfall, theblack soil, and the lower altitude favor the eastern part, the mostluxuriant grassland is found there. Pound and Clements (1898) havemapped the prairie province and they term the eastern region theprairie-grass region. T-ie more arid belt v/est of this, the sand-hillregion, is characterized by the sand-prairie formation. Its northernlimit is near the southwest corner of North Dakota, and from there it. extends as a broad belt southward through central South Dakota, cen-tral Nebraska, western Kansas, the eastern border of Colorado, west-ern Oklalioma, and central Texas. The third vegetation region lieswest of the sand hill country, along the eastern border of the RockyMountains. Itis called the foothill region, and is characterized byopen formations of wiry grasses a-nd plants of desert type. The animals of the prairie province are well adapted to the phy-sical conditions of the prairie and to its vegetation. Craig (1903)has shown that t::e plant and animal life of the prairie is well adap-ted to the physical conditions, chief of v/hich are the level charactea:of the open plains, the comparative aridity, and the severity of thewinter. The flatness has resulted in a monotonous uniformity of thevegetation, and in the adoption of the wind mode of seed the animals the absence of shelter has given rise to highly de-veloped pow
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