Diversity and sensitivity of epiphytes to oxides of nitrogen in London

TitleDiversity and sensitivity of epiphytes to oxides of nitrogen in London
Publication TypeJournal
Year of Publication2007
AuthorsDavies, L, Bates, JW, Bell, JNB, James, PW, Purvis, OW
Journal/BookEnvironmental Pollution
Volume146
Pagination299-310
Abstract

This study investigated the distribution and diversity of epiphytes in London in relation to NO(x) using fine-scale atmospheric dispersion modelling. The survey recorded over 3000 epiphytes from 334 trees (Fraxinus excelsior) representing 74 lichen, 14 moss, 7 fungal and 3 algal species. There was a significant inverse relationship between diversity and NO(x). Diversity declined where NO(x) exceeded 70 microg m(-3) and NO2 exceeded 40 microg m(-3), suggesting a phytotoxic effect. However, there was a significant positive relationship between NO(x) and lichen abundance due to the ubiquitous distribution of pollution tolerant species, mainly associated with eutrophication. A scale of lichen sensitivity to NO(x) has been derived.

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