Acknowledgements
We thank the members of the University of Kansas Ecological Niche Modeling Group for their support, assistance, and advice, during the development of this contribution. Luis Escobar provided help with NicheA, which was central to early explorations during this project. We also thank Richard Glor, Mark Holder, Daniel Reuman, and Jorge SoberĂ³n (University of Kansas) for their time and advice regarding complex analytical challenges.