| Abstract: | An epiphytic lichen and a soil lichen in two very closely related genera (Parmelia sulcata and Xanthoparmelia chlorochroa, respectively) were sampled 16 years apart at Theodore Roosevelt National Park in North Dakota and measured for their elemental content. Mercury and cadmium decreased approximately 30% over the time period in both species. Sulfur decreased 8% in the epiphytic species, but increased 20% in the soil lichen. Factor analysis revealed that soil elements were higher in the soil lichen, indicating there was some soil contamination in that species. A relationship between iron and titanium was found only in the soil lichen. Sulfur and mercury were highly enriched in both species relative to the soil, which suggests that the atmosphere is a contributing source of these elements. New baseline values were calculated, 22 elements for both species, although it is not recommended that the soil lichen be sampled in the future. |
| Genre: | Article |
| ProdID: | 1003658 |
| Citation Author: | Bennett, J. P.; Wetmore, C. M. |
| Citation Contributing Office: | National Wildlife Health Center |
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| Citation End Page: | 241 |
| Citation Issue: | 1-3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science of the Total Environment |
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| Citation Number Of Pages: | 11 |
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| Citation Phsyical Description: | p. 231-241 |
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| Citation Search Results Text: | 16-year trends in elements of lichens at Theodore Roosevelt National Park, ND; 2000; Article; Journal; Science of the Total Environment; Bennett, J. P.; Wetmore, C. M. |
| Citation Start Page: | 231 |
| Citation Volume: | 263 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | 16-year trends in elements of lichens at Theodore Roosevelt National Park, ND; 2000; Article; Journal; Science of the Total Environment; Bennett, J. P.; Wetmore, C. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (INDEX PAGE): | http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V78-41WBFVC-R&_user=696292&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000038819&_version=1&_urlVersion=0&_userid=696292&md5=a8e9c6a7c34e38cb0854deb2c6bf61c8 |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
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