Endophyte operational taxonomic units (OTUs) that predominated in isolates from S. alterniflora roots and leaves, with putative taxonomic assignments (NCBI Genbank accession numbers, % identity and % sequence cover given in Table B of S1 File).

*Average abundance is presented for each OTU for oiled and reference areas. Average abundance was calculated using SIMPER in PRIMER v.7. All abundance values for each OTU within a group, (e.g., all abundance values for Bacillus pumilus within Bay Jimmy Roots from oiled areas) were summed and this total divided by the number of samples within the group.§ Percent contribution is a measure of the amount of variation explained by each OTU separately within each group (Bay Jimmy Roots).¶ Cumulative percent contribution is the running total variation accounted for by a given set of OTUs within a group. For example, the first four OTUs listed within the Bay Jimmy roots group, together account for 28.44% of the total variation within this group, and the sixteen OTUs listed for this group account for 72.04% of the total variation within Bay Jimmy roots.Endophyte operational taxonomic units (OTUs) that predominated in isolates from S. alterniflora roots and leaves, with putative taxonomic assignments (NCBI Genbank accession numbers, % identity and % sequence cover given in Table B of S1 File).