Hello, I am trying to determine the best way to test for a difference in the overall mussel community found in a stream between 1980 and 2008. I have seven sites with presence/absence data. In addition to various descriptive statistics and graphs (nonmetric multidimensional scaling) I would like to use ANOSIM because it offers a P-value, and answers the question: "well, is there a difference or not?". I am not as up-to-date on this literature as I would like to be. Does anyone know if this is still an accepted test? Would some type of multi-response permutation procedure be better?
T. Travis Brown [email protected]
