R help - Apr 2010 - adehabitat functions

Is there a way to just build a madifa function in adehabitat just using a .csv
file with presences and the corresponding environmental data? I'm trying to
model the species distribution of a species using 45 environmental grids and r
crashes after loading just 5 of them. I'd like to develop the function and
then
predict it using a line by line predict function, but can't figure out if
you
can just build functions in adehabitat without loading entire rasters.

Thanks,
Helen