Table 4.

Summary of the antibiotic-tolerant ASVs (see Table S4 for full data)

Symbiodiniaceae associations are based on data from Maire et al. [69], with ‘Close’ and ‘Loose’ associates defined as ‘bacteria tightly attached to the algal cell’s exterior’ and ‘planktonic bacteria’ from the Symbiodiniaceae culture medium, respectively. P-values for the Day 0 vs. Day 21 comparisons were calculated using Mann–Whitney U tests (α=0.5).

Taxonomic classification				Absolute abundance (16S/H × 103)						Day 0 vs Day 21 P-value	Present in A. salinas?	Symbiodiniaceae association?
Class	Order	Family	Genus	Day 0	Day 1	Day 3	Day 7	Day 14	Day 21			Intracellular	Close	Loose
Gammaproteobacteria	Vibrionales	Vibrionaceae	Vibrio	6928	6472	4745	1590	1417	1524	0.310		yes	yes
Gammaproteobacteria	–	–	–	20634	28507	9458	4674	2676	1061	0.008
Alphaproteobacteria	Sphingomonadales	Sphingomonadaceae	Sphingomonas	4922	3712	5598	1908	3182	1204	0.016	yes
Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	Thalassobius	94123	56861	25879	11433	7282	6906	0.032
Gammaproteobacteria	Coxiellales	Coxiellaceae	Coxiella	43074	21771	15844	7171	78850	1903	0.008
Gammaproteobacteria	Alteromonadales	Alteromonadaceae	–	15508	8025	11956	3753	4789	8869	0.095		yes	yes
Gammaproteobacteria	Vibrionales	Vibrionaceae	Vibrio	10338	7333	6792	2439	1248	1238	0.032	yes	yes	yes	yes
Alphaproteobacteria	Sphingomonadales	Sphingomonadaceae	Erythrobacter	8616	26317	11092	1290	1002	1754	0.421	yes
Deltaproteobacteria	Oligoflexales	Oligoflexaceae	–	397755	67349	58628	10436	15986	3330	0.008
Alphaproteobacteria	Rickettsiales	SM2D12	–	9099	9491	12574	3197	1861	1794	0.032
Gammaproteobacteria	Alteromonadales	Marinobacteraceae	Marinobacter	5299	1727	4680	1614	2682	3022	0.548		yes	yes	yes
Alphaproteobacteria	Rhodobacterales	Rhodobacteraceae	Shimia	135153	5405	6342	2342	4440	2738	0.032	yes	yes	yes
Bacteroidia	Chitinophagales	Saprospiraceae	–	56148	3157	6652	1988	7482	17836	0.222	yes
Gammaproteobacteria	Xanthomonadales	Xanthomonadaceae	Stenotrophomonas	32799	30630	37369	14014	20619	8801	0.016	yes	yes	yes	yes
Gammaproteobacteria	Vibrionales	Vibrionaceae	Vibrio	8025	6303	5786	1775	1185	1311	0.421		yes	yes
Alphaproteobacteria	Rhodospirillales	Terasakiellaceae	–	28068	51153	58769	17803	10451	3742	0.032