*2.2. Experimental Methods*

#### DNA Extraction and Sequencing

Genomic DNA was extracted using a Marine Tissue Genomic DNA Extraction Kit (Mobio, Guangzhou, China), and its concentration was measured using a UV spectrophotometer after DNA extraction. The concentration was adjusted to 50 ng/μL and the DNA was stored at 4 ◦C. Samples from 12 randomly selected individuals were sequenced on the Illumina NovaSeq platform at the Institute of Bioinformatics (Beijing, China).
