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Maximum phytoplankton biovolume sustained by experimental filtrates (mean ± s.e.). The biovolumes of phytoplankton strains cultured in the filtrate from the naive population (black dots) are 1.9 × 102–2.1 × 105 higher (Chlamydomonas reinhardtii UTEX 89 and Synechocystis sp. UHCC 0318, respectively) compared with the evolved population (white dots). (Details of the phytoplankton species used can be found in the electronic supplementary material, table S1.)
