Hello, I want to do an unconstrained ordination to look at my plant community data but don't know how to account for the fact I have multiple visits per site. Do I need to look at each month separately? My data set is of 30 field sites that I visited 5 times in the year and the abundance of each plant species is in each column; site month species a species b species c ...etc 1 may 1 0 7 1 june 5 0 9 1 july 2 8 0 1 aug 12 6 0 1 sept 14 5 0 2 may 2 etc (I have additional environmental data for later analyses) Also, is there much difference between analysis in Canoco and R? Thanks Cathy [[alternative HTML version deleted]]