title: Lichen communities along a pollution gradient 40 years after decommissioning of a Cu-Ni smelter.
abstract: Pollution control initiatives in Greater Sudbury, Ontario, Canada, resulted in the decommissioning of the Coniston Smelter in 1972. The last assessment of the effects from the smelter on the surrounding lichen biota was in 1990, which showed an overall improvement in richness following these initiatives, but still few species were present close to the smelter. We examined five sites along this gradient to determine if this pattern is still present on the landscape. Sixty-four macrolichen species in 15 genera were found. Lichen richness and Shannon diversity increased at all sites, but the increase was no longer linear with distance from the smelter. There was no significant difference between lichen richness and diversity at sites at increasing distances from the smelter. We show that past air pollution from the Coniston Smelter is no longer restricting lichen growth and development in the Greater Sudbury area as it was historically. Lichen populations are, therefore, now shaped by other environmental variables.
authors.affiliation: Global Ecological Change and Sustainability Laboratory, School of Environmental Sciences, University of Guelph, 50 Stone Road East, Guelph, ON, N1G 2W1, Canada, lschram@uoguelph.ca.
authors.forename: Lyndsay J
authors.initials: LJ
authors.lastname: Schram
authors.forename: Christopher
authors.initials: C
authors.lastname: Wagner
authors.forename: Richard Troy
authors.initials: RT
authors.lastname: McMullin
authors.forename: Madhur
authors.initials: M
authors.lastname: Anand
mesh_terms: D002170:Canada; D003300:Copper / Q000737:chemistry / Q000633:toxicity*; D004784:Environmental Monitoring / Q000379:methods; D004785:Environmental Pollutants / Q000737:chemistry / Q000633:toxicity*; D008011:Lichens / Q000187:drug effects* / Q000254:growth & development; D008669:Metallurgy; D009532:Nickel / Q000737:chemistry / Q000633:toxicity*; D013997:Time Factors
chemical_list: D004785:Environmental Pollutants; D003300:Copper; D009532:Nickel