Why is important to find out if there is a difference in perch heights and widths of species of Anolis lizard?

Answer 1

Resource partitioning of any kind (preferred food type or food size, nesting site height or type, etc.) is interesting as a way of understanding interactions between groups of organisms. For instance, it's generally assumed that (a) there is a limited amount of any particular kind of a resource, and (b) that some resources are better in some way than others, which leads to the idea that there should be competition over the resources to see who gets the best, who gets the next best and so forth. This competition is assumed to be the driving force behind natural selection.
Perch choice in Anolis might be related to mate attraction and possibly to predation (both by and on the lizard). In any case, it helps to define the 'niche' of the particular lizard species. It may help to understand why different species occupy different areas, or have different population sizes, or behave differently in some way.