This data is from the paper http://onlinelibrary.wiley.com/doi/10.1111/ele.12279/abstract in Ecology Letters titled "How context dependent are species interactions?", which I wrote with Judith Bronstein and Jennifer Rudgers.
The three `.csv` files are preliminary data, the final data we used to do our analyses, and a csv file with paper selection notes. The `.R` file was used to process the preliminary dataset to the final one. The final analyses were done in SAS, and I don't have persmission to share those. Anyway, the point here is that I think the raw data could be useful to others.
See the paper and methods section for how we collected data: http://scottchamberlain.info/pdfs/ChamberlainEtal2014EcolLett.pdf