Ecological Archives E094059A3
Peter C. le Roux, Jonathan Lenoir, Loïc Pellissier, Mary S. Wisz, Miska Luoto. 2013. Horizontal, but not vertical, biotic interactions affect finescale plant distribution patterns in a lowenergy system. Ecology 94:671–682. http://dx.doi.org/10.1890/121482.1
Appendix C. Results of spatial autocorrelation analyses for the predictor variables.
Table C1. Spatial autocorrelation (as measured by Moran’s I) in the explanatory variables. Autocorrelation was calculcated at 1 m lags over a 10 m extent in each grid using the moran.test function (from the spdep package) in R (available from http://www.rproject.org/), and then averaged across the six grids for each predictor variable. Betula = cover of Betula nana, Empetrum = cover of Empetrum nigrum ssp. hermaphroditum.
Variable group 
Predictor 
Global Moran's I 
Mean Moran's I (± SE) for variable group 
Abiotic variables 
Mesotopography 
0.208 
0.133 ± 0.037 
Soil moisture 
0.109 

Soil temperature 
0.226 

Radiation 
0.033 

pH 
0.088 

Vertical biotic interactions 
Reindeer paths 
0.046 
0.014 ± 0.010 
Lemming burrows 
0.014 

Reindeer dung 
0.000 

Lemming dung 
0.004 

Horizontal biotic interactions 
Betula 
0.009 
0.023 ± 0.009 

Empetrum 
0.036 
