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Upper Midwest forest-savanna transition
savanna, Cedar Creek Natural History Area (Long-term Ecological Research), Minnesota (c) 2005 Ron E. VanNimwegen
Source of bioregions data: Olson, D. M. and E. Dinerstein. The Global 200: Priority ecoregions for global conservation. (PDF file) Annals of the Missouri Botanical Garden 89:125-126.
Distinctiveness (1=highest,4=lowest): 4
This ecoregion contains the last concentration of black soil tall-grass savanna in the United States.*
Conservation Status (1=most endangered, 5=most
intact): 1 (critical)
Less than 5% of the habitat in this ecoregion remains intact. Nearly all of the oak savanna in the ecoregion has been destroyed by conversion to agriculture. Remaining semi-natural habitat suffers invasion of woody shrubs due to fire supression.*
oak savanna, Anoka Co., Minnesota (c) 2005 Jason J. Husveth hires
riparian forest, Wisconsin Dells, Wisconsin (c) 2005 James H. Bassett hires
black ash (hardwood) swamp, Hennepin Co., Minnesota (c) 2005 Jason J. Husveth hires
lake sedge meadow, Hennepin Co., Minnesota (c) 2005 Jason J. Husveth hires
wet prairie - rich fen, Anoka Co., Minnesota (c) 2005 Jason J. Husveth hires
* Ricketts, T.H., E. Dinerstein, D.M. Olson, C.J. Loucks, et al. (1999) Terrestrial Ecoregions of North America: A Conservation Assessment. World Wildlife Fund - United States and Canada. Island Press, Washington, D.C. pp. 164-166.