Temporal changes in metal levels of the lichens Parmotrema praesorediosum and Ramalina stenospora,Southwest Louisiana |
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| Authors: | Dorothy A. Walther Gerald J. Ramelow James N. Beck John C. Young James D. Callahan Michael F. Maroon |
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| Affiliation: | 1. Department of Chemistry, McNeese State University, 70609-0455, Lake Charles, LA, U.S.A.
2. Department of Mathematics, Computing Science and Statistics, McNeese State University, 70609-2340, Lake Charles, LA, U.S.A.
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| Abstract: | Two species of lichen native to southwest Lousiana, Parmotrema praesorediosum (Nyl.) Hale and Ramalina stenospora, Mull. Arg. have been investigated as air pollution monitors. Over the period 1983–88 samples were collected at 18 stations in the Lake Charles/Westlake/Sulphur area. The samples were analyzed for A1, Fe, Cu, Pb, Cd, Hg, Cr, and Zn. When metal concentrations in lichens were plotted vs year for certain representative stations, a dramatic reduction in the concentrations of certain metals was seen after 1983. When the most recent data are compared with those previously obtained, the effects of the industrial zone, which was previously demonstrated, have now all but disappeared. |
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