rwhitehead at cix.compulink.co.uk
Wed Apr 17 03:32:05 EST 1996
<< Lichens are indicators of air pollution. >>
Or, rather, the absence of them is. 8-)
Nettles are usually an indicator of animal habitation, human or
otherwise, since they like nitrogen-rich soil.
Have you thought of doing a search for "indicator species" or similar on
something like altavista (http://www.altavista.digital.com)?
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