cross validation for species distribution

Elaine,

That's a fair answer, but completely not what I meant. I was hoping
that you would elaborate on "the species data of species distribution
models". What types of inputs and output for this particular modeling
application etc.

Is it the same with the function inside caret, ipred, and e1071?package?

Yes and there are other resampling options other than k-fold CV.

For caret, you might start with this paper:

  www.jstatsoft.org/v28/i05/

That should tell you most of what you need to know.

Max