Hur ser lavars fördelning ut runt stammen på ek, och påverkas den av trädets storlek och dess närmiljö?
BarksprickedjupCliostomum corrugatumLavars distributionNaturvårdOmkretsSolexponeringTräd- och buskskikt.
The aim of this study was to describe preferences of geographic direction of ten, oak-living epiphytic lichen species and how they responded to sun exposure, nearby bushes and trees, bark fissure depth and circumference. The frequency of every species was recorded in arcs of ten degrees around the tree at a height of 130 to 180 cm above the ground. An estimation of the amount of every species in every arc was also recorded. To analyse how the distribution of the lichen species responded to the different factors their concentration for every tree was plotted against the four factors. The distribution of Cliostomum corrugatum had a positive response to high sun exposure and a negative response to a thick layer of bushes and trees. However the distribution of Lepraria incana had a negative response to high sun exposure and a positive response to a thick layer of bushes and trees. Only the distribution of Calicium viride had a significant response to the circumference of the tree. No species had a significant response to the bark fissure depth in this study. For the conservation of the rare C. corrugatum, oaks on which the species is growing should be cleansed from nearby bushes and trees to increase the sun exposure.