SRX3644903 4.3.2b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909670 SAMN08142156 4.3.2b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644904 5.2.2b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909671 SAMN08142157 5.2.2b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644905 4.1.1b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909672 SAMN08142146 4.1.1b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644906 4.2.1b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909673 SAMN08142147 4.2.1b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644907 4.3.1b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909674 SAMN08142148 4.3.1b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644908 5.2.1b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909675 SAMN08142149 5.2.1b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644909 5.3.1b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909676 SAMN08142150 5.3.1b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644910 6.3.2b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909677 SAMN08142151 6.3.2b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644911 4.1.2b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909678 SAMN08142154 4.1.2b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644912 4.2.2b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909679 SAMN08142155 4.2.2b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644913 4.1.3b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909680 SAMN08142161 4.1.3b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644914 4.2.3b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909681 SAMN08142162 4.2.3b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644915 5.3.2b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909682 SAMN08142158 5.3.2b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644916 6.3.3b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909683 SAMN08142159 6.3.3b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644917 5.3.3b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909684 SAMN08142165 5.3.3b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644918 4.3.3b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909685 SAMN08142163 4.3.3b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500 SRX3644919 5.2.4b SRP132109 PRJNA429980 17 healthy Saccharina japonica individuals were collected in 2015 at AilianBay, Rongcheng, China. DNA was then extracted from algal samples using a Ezup Column Bacteria Genomic DNA Purification Kit (Sangon Biotech, Shanghai, China). Next generation sequencing library preparations and Illumina HiSeq sequencing were conducted targeting the variable region 3 and 4 of the 16S rRNA gene with the universal bacterial/archaeal primers 341F/806R. SRS2909686 SAMN08142164 5.2.4b AMPLICON METAGENOMIC PCR Illumina HiSeq 2500