Before the experiment, the P. delicatissima culture was acclimatized
at 15 ± 1 °C for 2 weeks under the same light conditions. In order to
maintain constant abundance of P. delicatissima in experimental tanks
(D1, D2, and D3), in vivo fluorescence of chlorophyll-a was used as a
proxy of P. delicatissima abundance. Hence, a preliminary batch culture