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visit four typical sand country ecotypes:
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The transition between the forests of eastern North America and
the tall grass prairie of the midwest and central plains
does not often form a distinct line in the Chicago
region. The boundary is especially indistinct in areas with sandy
soils. The sand prairie and black oak savanna region is really a mosaic of
ecotypes--plant and animal assemblages that occupy a given area. These
ecotypes reflect natural variables such as soil types, moisture
availability, exposure to sunshine, and temperature conditions. The
existence of these biological communities and their distribution is
also a testament to the effects human activity, management and
exploitation in historic and prehistoric times. |
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