Canadian Forest Service Publications
Early colonization of arboreal lichens on planted trees in a dry Douglas-fir forests in southern British Columbia. 2012. Arsenault, A.; Goward, T.Poster. Page 82 in J. O'Halloran et al. Second International IUFRO Conference on Biodiveristy in Forest Eccosystems and Landscapes, 28-31 August 2012, Cork, Ireland.
Issued by: Atlantic Forestry Centre
Catalog ID: 34543
Arboreal lichens are excellent indicators of environmental change due to their symbiotic relationship and biology. An increasing number of studies are showing significant impact of forest harvesting on arboreal lichen diversity. Much has been learned about the key role of specific microhabitats such as deadwood, and large old trees and forest age. However there is not a lot of information about how arboreal lichens colonize planted trees in young forests. This information is critical to understand how forest plantations can contribute to biodiversity and to investigate if key processes and patterns can be identified to accelerate recovery or mitigate loss of biodiversity in patch-cut or clear-cut operations. In order to address this gap we examined the development of branches on 27 planted Pinus ponderosa, Pinus contorta, and Pseudotsuga menziesii trees in a patch-cut and made observations on the patterns of lichen colonization at different stages of branch development. We have examined the pattern of thalli establishment for 18 lichen taxa on over 1300 branch segments. Preliminary observations suggest that hair lichen of the genus Bryoria is unique in that it establishes by both fallen thalli from adjacent large trees (parachutes) as well as new thalli. For all new thalli establishment it appears that rougher bark substrate especially at the node of branches is a significant factor. In addition it also appears that early establishment is closely associated with an unlichenized fungus which we hypothesize is an example of facilitated succession.