Hi Lara, in PAST every column represents a sample/site, each row a taxon/species. I'm nore sure how your data are organized, but you could pool your samples per site and would get 7 columns and n rows according to your number of species. If you click on the column attribute button you could name each column, and then simply highlight all columns and run "individual based rarefaction". There are plenty of videos on youtube, where you might find further infos. I hope this helps.

Thank you Stefanie, I will try it :)

Interesting question! A comprehensive, but simple-to-use software package for executing a range of standard numerical analysis and operations used in quantitative paleontology has been developed. The program, called PAST (PAleontological STatistics), runs on standard Windows computers and is available free of charge. PAST integrates spreadsheet-type data entry with univariate and multivariate statistics, curve fitting, time-series analysis, data plotting, and simple phylogenetic analysis. Many of the functions are specific to paleontology and ecology, and these functions are not found in standard, more extensive, statistical packages. PAST also includes fourteen case studies (data files and exercises) illustrating use of the program for paleontological problems, making it a complete educational package for courses in quantitative methods.

Hi Lara. Stefanie is right, to perform any diversity analysis in PAST, species must be represented in rows, and stations or data in columns. However, consider that for univariate or multivariate community analyses is the other way around. Good luck!