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Gothamie Weerakoon

Department of Botany, University of Sri Jayawardenapura, Sri Lanka


Wednesday 12 February 11:00

Sir Neil Chalmers seminar room, Darwin Centre LG16 (below Attenborough studio)

Corticolous lichen species are identified as indicators of disturbance for seven vegetation types in central mountains of Sri Lanka (four disturbed, and three undisturbed matched by habitat). Ordination of lichen communities (six sites / type for 42 sites) showed distinct species composition in the vegetation types. Disturbed and undisturbed sites differ; undisturbed sites have higher species richness of both trees and lichens. Canopy cover, bark pH, distance to an undisturbed site, and years since disturbance, were all correlated with a disturbance gradient. Indicator species analysis (ISA) was performed on three different sets of site groups: seven vegetation types, three groups of sites with different disturbance levels, and two groups of sites near to vs. far from an undisturbed site. Twenty species were strong indicators of undisturbed sites from all three ISA analyses; three species indicate moderately disturbed sites; five species indicate very disturbed sites. Six additional species were weaker indicators of disturbance level. Thirty-four species were strong indicators for a single vegetation type. Most indicators of disturbance level are visually distinct. Parataxonomists could be trained to identify them in the field; these will be the most useful indicators for land managers.



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