design: High-throughput sequencing was operated by Sangon Biotech (Shanghai) Co., Ltd. (Shanghai, China) on an Illumina MiSeq sequencer (Illumina, San Diego, CA, USA) , using Symbiodiniaceae ITS specific primers, ITSintfor2 (5-GATTGCAGAACTCCGTG-3) , and ITS3 -_x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0001__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000__x0000_