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The following book chapter gives the figure of 4% of tallgrass remaining.

Steinauer, E. M. and S. L. Collins. 1996. Prairie ecology - the tallgrass
prairie. In F. B. Samson and F. L. Knopf, Prairie conservation: preserving
North America's most endangered ecosystem. Island Press.

This chapter also has a table that quantifies the historic amount (ha),
current amount, and percent decline for each State and Province in the
tallgrass region.  The source of this information that they cite is

Samson, F. B. and F. L. Knopf. 1994. Prairie conservation in North
America. Bioscience 44:418-421.


On Tue, 9 Mar 1999, Mary Jane Hatfield wrote:

> A friend asked me...
> 
> "I had a message from a woman asking for documentation (a
> source to site) for the statements :
> 1- Native prairie soaks up ~12 inches of precipitation/hour ---
> 2- less than 1% of native prairie is left in Iowa
> the number I usually hear is "less than .1 of 1% or less than 1/2 od 1%
> of Iowa's native prairie remains"
> I think how they define native prairie is important in backing the
> numbers-"
> 
> Can anyone be of help?
> 
> Thanks.
> 
> MJ Hatfield
> 
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