Glenn M. G. & Webb S. L.
(1997):
Lichens as indicators of forest integrity,
Bibl. Lichenol.,
68: 155-164
The species richness and abundance of corticolous lichens was studied as a function of distance from an anthropogenic edge, in three forest types. Lichens and light were sampled systematically in transects from the edge to 45 m into the interior, in natural forests of Pinus resinosa, P. banks iana and in hardwood forests in NW Minnesota, and in two hardwood forests 100 km from New York City. Three-fold greater species richness per tree in MN, compared to the East is likely due to air pollution. Light …
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