<p>(A), (C) and (E) Microbial experiment of Langenheder et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0201135#pone.0201135.ref016" target="_blank">16</a>]. (B), (D) and (F) Biodiversity II experiment of Tilman et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0201135#pone.0201135.ref017" target="_blank">17</a>]. (A) and (B) Modelling of ecosystem function based on the hierarchical tree of species clustering, from 1 to 4 functional groups of species in both experiments (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0201135#pone.0201135.g002" target="_blank">Fig 2E and 2F</a>). Each bar corresponds to the error induced by leaving out the ecosystem to predi...