Response to Comment on Worldwide evidence of a unimodal relationship between productivity and plant species richness - Pither, Jason; Fraser, Lauchlan H.; Jentsch, Anke; Sternberg, Marcelo; Zobel, Martin; Cahill, James; Beierkuhnlein, Carl; Bartha, Sándor; Bennett, Jonathan A.; Boldgiv, Bazartseren; Brown, Leslie R.; Cabido, Marcelo; et al. (American Association for the Advancement of Science (AAAS), 2016)