Jeffrey R. Dunk, William J. Zielinski, and Haiganoush K. Preisler. 2004. Predicting the occurrence of rare mollusks in northern California Forests. Ecological Applications 14:713–729.

Physical/Climatic	Acronym
Annual temperature	ANNTMP
Annual precipitation	PPT
Coefficient of variation of December and July precipitation (a measure of seasonal variability in precipitation)	CVPRE
Summer precipitation	SMRP
Summer temperature	SMRTMP
Moisture stress index relating summer temperature and precipitation	SMRTSMRP
August maximum temperature	AUGMAXT
December minimum temperature	DECMINT
Difference between August maximum and December
Minimum temperatures	DIFTMP
Percent slope	SLP
Transformed aspect	TASP
Elevation	EL
Spatial
UTM east	EAST
UTM north	NORTH
Vegetation from FIA plots
Percentage total canopy cover	TC
Percentage canopy cover of conifers	CC
Percentage canopy cover of hardwoods	HC
Percentage shrub cover	SC
Percentage forb cover	FC
Percentage grass cover	GC
Percentage grass + forb cover	GFC
Total basal area	BA
Basal area of conifers	CBA
Basal area of hardwoods	HBA
Basal area of Quercus spp.	QBA
Basal area of Acer spp.	ABA
Mean age of trees in plot	AGE
Standard deviation (SD) of tree age	SAGE
Volume of downed wood	TWD
Volume of large (>25.4 cm diameter at base) downed wood	LRGWD
Volume of small (<25.4 cm diameter) downed wood	SMLWD
Mean tree diameter at breast height (dbh)	DBH
SD of tree dbh	SDBH
Mean dbh conifers	CDBH
SD dbh conifers	SCDBH
Mean dbh hardwoods	HDBH
SD dbh hardwoods	SHDBH
Mean tree height	HT
SD tree height	SHT
Mean height conifers	CHT
SD height conifers	SCHT
Mean height hardwoods	HHT
SD height hardwoods	SHHT
Mesoscale variables
Hectares of plantation	PL
Hectares of young/early mature conifers	YC
Hectares of young/early mature conifers, low density	YCL
Hectares of hardwoods	HD
Hectares of late-seral conifer dominated	LC
Hectares of late-seral, low density, conifer dominated	LCL
Hectares of late-seral hardwood dominated	LHD
Meters of blue-lined stream	STR
Meters of road	RD