Dataset: 16S rRNA sequences for outplanted Acropora cervicornis sexual recruits collected from Mote Marine Laboratory and Looe Key National Marine Sanctuary from 2020-2022

To sample each coral, 6-8 polyps were excised from outplanted corals using bone cutters and temporarily stored in individual Whirl-Paks on ice until reaching shore. Upon shore, samples were transferred from Whirl Parks using flame-sterilized tweezers placed in a 1.5mL microcentrifuge tube containing 1mL of DNA/RNA shield (Zymo Research, R1100-250, Irvine, CA, USA). Samples were transferred to a -80℃ freezer for long-term storage. In preparation for DNA extractions, the samples were removed from the -80℃ freezer and thawed on ice. With flame-sterilized tweezers, half of the biomass was transferred to a Disruptor Tube (Omega Bio-Tek, Norcross, GA, USA), the other half was kept as a bioarchive and returned to -80℃. DNA from each sample was isolated utilizing the E.Z.N.A.® Soil DNA Kit (Omega Bio-Tek, Norcross, GA, USA) with slight modifications to the manufacturer’s protocol to increase yield. DNA isolates were stored at -80℃. DNA quantity and quality was assessed utilizing a NanoDrop spectrophotometer (Thermo Fisher Scientific™, Waltham, MA, USA). Samples were submitted to MR DNA for 16S rRNA PCR amplification and sequencing (www.mrdnalab.com, Shallowater, TX, USA). Amplification of the 16S rRNA gene was conducted using the 515F-806R primer set, which targets the V4 region of the 16S rRNA, with barcodes on the forward primer (Apprill et al., 2015). The 16S rRNA gene V4 variable region was amplified via a 30-cycle PCR using the HotStarTaq Plus Master Mix Kit (Qiagen, Germantown, MD) under the following conditions: 95°C for 5 minutes, followed by 30 cycles of 95°C for 30 seconds, 53°C for 40 seconds and 72°C for 1 minute, after which a final elongation step at 72°C for 10 minutes was performed. After amplification, PCR products were checked in 2% agarose gel to determine the success of amplification and the relative intensity of bands. Samples were multiplexed using unique dual indices and were pooled together in equal proportions based on their molecular weight and DNA concentrations. Pooled samples were purified using calibrated Ampure XP beads (Beckman Coutler, CA, USA). Then the pooled and purified PCR product was used to prepare an Illumina DNA library. A PCR negative control was included in library preparation but did not produce a viable library. Paired-end sequencing was performed at MR DNA on an Illumina MiSeq following the manufacturer's guidelines.

Sampling locations:

- Mote's in situ nursery. Approximate central coordinate 24.56257, -81.40009.
- Site in Looe Key National Marine Sanctuary: U-10, U-11, and U-12. Approximate central coordinate 24.54093, -81.43539.
- Site in Looe Key National Marine Sanctuary: Unnamed site west of U-11. Approximate central coordinate 24.54069, -81.43652.

Samples collected under permit number FKNMS-2020-188