title: Which factors are responsible for the changing lichen floras of London?
abstract: SO(2) is no longer the principal factor influencing the vitality and composition of lichen assemblages in London. We provide direct evidence for an impact on lichen growth during episodic high exhaust emissions coupled with unusual climatic conditions. This suggests a combination of particles and nitrogen plays a major role in influencing lichen growth. Nitrogen from traffic emissions may be at least as important as agriculture in influencing the composition of lichen assemblages.
authors.affiliation: Department of Botany, The Natural History Museum, Cromwell Road, SW7 5BD, London, UK. w.purvis@nhm.ac.uk
authors.forename: O W
authors.initials: OW
authors.lastname: Purvis
authors.forename: J
authors.initials: J
authors.lastname: Chimonides
authors.forename: V
authors.initials: V
authors.lastname: Din
authors.forename: L
authors.initials: L
authors.lastname: Erotokritou
authors.forename: T
authors.initials: T
authors.lastname: Jeffries
authors.forename: G C
authors.initials: GC
authors.lastname: Jones
authors.forename: S
authors.initials: S
authors.lastname: Louwhoff
authors.forename: H
authors.initials: H
authors.lastname: Read
authors.forename: B
authors.initials: B
authors.lastname: Spiro
mesh_terms: D000383:Agriculture; D000393:Air Pollutants / Q000009:adverse effects*; D008011:Lichens; D008131:London; D009584:Nitrogen / Q000009:adverse effects*; D011157:Population Dynamics; D013458:Sulfur Dioxide / Q000009:adverse effects*; D001335:Vehicle Emissions
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions; D013458:Sulfur Dioxide; D009584:Nitrogen