Lichen abundance on two tree species

Lichen_Names.csv: this is a csv file (34 rows, 2 columns), with a header line. The first column is lichen species scientific names. Species names are as listed in the most recent Checklist of North American Lichen (Esslinger 2019). The second column is the species codes as used in the associated manuscript.

bF_abundanceTreeLevel.csv: this is a csv file (21 rows, 26 columns, with a header line). The data describe lichen abundance on 21 balsam fir (Abies balsamea) trees in the Central Avalon Ecoregion, island of Newfoundland, Canada. The first column is the TreeID. The remaining columns list the abundance (number of individual thalli) of each species found on each tree. Associated species names for each code are found in the Lichen_Names.csv file

yB_abundanceTreeLevel.csv: this is a csv file (21 rows, 31columns, with a header line). The data describe lichen abundance on 21 yellow birch (Betula alleghaniensis) trees in the Central Avalon Ecoregion, island of Newfoundland, Canada. The first column is the TreeID. The remaining columns list the abundance (number of individual thalli) of each species found on each tree. Associated species names for each code are found in the Lichen_Names.csv file.

TreeSiteData_BF.csv: this is a csv file (21 rows, 16 columns, with a header file). The data are the tree-and site level data for the 21 balsam fir (Abies balsamea) trees.

TreeSiteData_YB.csv: this is a csv file (21 rows, 16 columns, with a header file). The data are the tree-and site level data for the 21 balsam fir (Betula alleghaniensis) trees.

For the two “TreeSiteData” files, the column details are as follows

· TreeID: The treeID number (same as in the lichen abundance datasets)

· Texture: a categorical variable that ranks the bark texture from 1-3 (1 is relatively smooth, 2 is moderately ridged, 3 is deeply and heavily ridged)

· Canopy1: This is the canopy cover (percent cover) at the tree base measured using a spherical densiometer

· Height: This is the height of the tree, in metres, measured using a Suunto Clinometer

· pH: This is the bark pH, measured following the procedure outlined in the manuscript

· Age: The is the age of the tree, as measured using an increment borer

· Age_AG: The age of the tree as measured by a second technician who checked the tree cores

· Slope: This is the slope (percent) of the plot taken at the centre of the plot, measured with a Suunto clinometer

· Positon: These are categorical values to describe the slope positon on which the tree is found on; 1: upper slope, 2: mid slope, 3: lower slope, 4: toe, or 5: level.

· Aspect: Compass aspect (0-360°) adjusted for declination at which the slope faces

· Adj_aspect: Compass aspect adjusted to absolute from North (values 0-180°)

· Cardinal: The cardinal direction of the slope face (taken from Aspect) but adjusted as categorical data; 1: north, 2: northeast, 3: east, 4: southeast, 5: south, 6: southwest, 7: west, 8 northwest.

· Distance: Distance between the two trees at the site.

· Canopy2: Average canopy density taken at the centre of the site (mid-way point between the two tree species sampled

· Density: Stem density in the stand, measured using the point-quarter method, as outlined in the methods section of the manuscript.