Antarctic overwintering gut microbiota: rank-level (phylum–genus) relative-abundance tables and alpha-diversity metrics (Syowa Station, JARE; T1–T3) [Dataset]

This record contains the analysis-ready data underlying the manuscript “Gut Microbiota in Japanese Antarctic Research Expedition Members Overwintering at Syowa Station: Stability and Limited Probiotic Effects.” The dataset compiles vendor-provided, aggregated 16S outputs (no raw FASTQ) as rank-level relative-abundance tables and per-sample alpha-diversity metrics across three timepoints (T1–T3) and four allocation groups (BT/BF/MB/CT). Files include: jare_syowa_gut_microbiota_rank_tables_T1-T3_v1.0.xlsx — Sheets: phylum, class, order, family, genus (+ README). Values are proportions (0–1); rows = taxa, columns = samples. jare_syowa_alpha_diversity_T1-T3_v1.0.xlsx — Per-sample Chao1, Shannon, and Inverse Simpson.