head(mites)
str(mites)

# 70 mite communities sampled from moss cores collected at the Station de Biologie des Laurentides, QC.
# For each core/sample, the following data is provided:
# $Galumna: abundance of mite genus 'Galumna'
# $pa: presence (1) or absence (0) of Galumna, irrespective of abundance
# $totalabund: total abundance of mites of all species
# $prop: proportion of Galumna in the mite community. i.e. Galumna/totalabund
# $SubsDens: substrate density
# $WatrCont: water content
# $Substrate: type of substrate.
# $Shrub: abundance of shrubs. Coded as a factor.
# $Topo: microtopography. blanket or hummock.