Abundance matrix.  
  Part of: Varsos C, Patkos T, Oulas A, Pavloudi C, Gougousis A, Ijaz U, Filiopoulou I, Pattakos N, Vanden Berghe E, Fern├índez-Guerra A, Faulwetter S, Chatzinikolaou E, Pafilis E, Bekiari C, Doerr M, Arvanitidis C (2016) Optimized R functions for analysis of ecological community data using the R virtual laboratory (RvLab). Biodiversity Data Journal 4: e8357. https://doi.org/10.3897/BDJ.4.e8357