The photosystem II efficiency of the symbiotic algae of Sorites orbiculus was measured with PAM-fluorometry in an experiment, assessing the long-term stability of newly established symbiotic associations. Therefore, specimens were cultivated for 14 days following menthol-DCMU bleaching and re-inoculation with Symbiodinium microadriaticum (strains KB8 and CCMP2467) and Fugacium kawagutii (strain F2) individually and collectively. Specimens were cultivated in 6-well plates, with 12 samples containing 4 replicates and 2 samples containing 2 replicates per treatment / control. The medium, supplemented with a Nannochloropsis food mixture, was exchanged twice weekly. Control groups included non-bleached specimens and bleached specimens maintained with or without 5 µmol L-1 DCMU in artificial seawater (ASW). Environmental conditions were maintained at 22 - 24°C temperature, 37.5 - 40.5‰ salinity, and 46 - 63 µmol photons cm-2 s-1 illumination under a 12:12 h light-dark cycle.

Symbiodinium microadriaticum, strain CCMP2467: collected in the Gulf of Aquaba on 2004-07-30, symbiont isolated from Stylophora pistillataSymbiodinium microadriaticum, strain KB8: collected in Hawaii, symbiont isolated from Cassiopaia xamanchaFugacium kawagutii, strain F2: collected in Jamaica, Caribbean, symbiont isolated from Meandrina meandrites