Other types of numerics (for ecology)

When I think to numerics, I always think to the "Concrete Mathematics" that Donald Knuth taught to us, or to way to integrate partial differential equations. Recently, however, I came across the book by Legendre and Legendre called "Numerical Ecology", which is something different.

 The work is something in between statistics and classification or clustering stuff, interpretation of structures. Interpretation of spatial data. A hybrid of things, in my view, interesting to know, anyway.

Reference

Legendre, P and Legendre L, Numerical Ecology, Amsterdam, Elsevier, 2003