I found the following text on the internet and that is exactly what I
am looking for, Do you have an answer to this question already?
to examine species distributions I'm looking for a program
to create a shade-matrix from a species-station table,
i.e. to replace each count in the table with a symbol whichs
size (or shade) is proportional to the value.
It's a common procedure to compare species distribution
between different sites, but until now I didn't find a
handy tool for this task.
Any suggestion where to find such a tool would be
appreciated very much.
Laboratory of Aquatic Ecology
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tel : +0032-016-32 45 74
fax : +0032-016-32 45 75