Sigal L.L. & Nash T.H. III
(1983):
Lichen communities on conifers in southern California mountains: an ecological survey relative to oxidant air pollution,
Ecology,
64(6): 1343-1354
In comparison with collections from the early 1900's when oxidant air pollution was essentially absent, 50% fewer lichen species were found on conifers during 3 yr (1976-1979) of col- lecting and sampling in the mountains of Southern California. Among the five mountain ranges studied, the San Bernardino Mountains, the region with the highest oxidant levels, had lower lichen frequency and cover values. Within the San Bernardino study sites, lichen cover was inversely related to estimated oxidant doses. …
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