The ZIP file Abunds.zip contains the Indo-Pacific coral and fish count data analyzed in the associated publication. Each of the 30 CSV files contains the data for one metacommunity. The file name indicates the taxon (corals or fishes), the habitat (crest, flat, or slope), and the region (note FP=French Polynesia, and PNG = Papua New Guinea). Within each CSV file, rows are species, and columns are sites. The files have a column heading. Values in the data matrix are counts. For corals, they are the number of distinct intercepts observed at the site for each species. For fishes, they are the number of individual fishes observed. Note that the counts of large fishes were made on wider transects than the counts of small fishes, so the fish counted on the wide transects have been subsampled to represent equivalent sampling effort. The field methods, and the subsampling algorithm, are described briefly in the linked publication, and in more detail in Connolly et al. (2005). LITERATURE CITED Connolly, S. R., T. P. Hughes, D. R. Bellwood, and R. H. Karlson. 2005. Community structure of corals and reef fishes at multiple scales. Science 309: 1363-1365.