Microbes play a central role in the degradation of chemical pollutants in the oceans, yet most studies investigating this are conducted in a laboratory setting which does not accurately portray and account for the prevailing physical and geochemical conditions in the deep sea. The Faroe-Shetland Channel (FSC) is a deep water, sub-Arctic region to the north of Scotland with >40-yr history of oil exploration and production. Here, we investigate the bacterioplankton community response to crude oil by enclosing water samples from ∼500 m depth in dialysis bags and incubating them in-situ to account for the role of environmental conditions. Using barcoded-amplicon 16S rRNA sequencing, the community strongly and rapidly responded to the oil within 4 days, particularly dominated by members of the genera Pseudoalteromonas , Alcanivorax , Mesonia , Alteromonas , and to a lesser extent Sulfitobacter , Vibrio and Thalassospira . Intriguingly, typical psychrophilic oil-degraders like Colwellia and Oleispira were not enriched, possibly due to being outcompeted by better adapted, more ‘aggressive’ hydrocarbon-degraders at this water depth. Using cultivation-based methods coupled with DNA-based stable isotope probing (DNA-SIP), we identified a diversity of oil-degraders, some of which ( i.e. Mesonia , Spongiispira , Stutzerimonas , Vreelandella , Sulfitobacter , Paraglaciecola ) had not hitherto been found in sequencing surveys or confirmed as oil-degraders in the FSC. Collectively, we show for the first time the presence of a diverse hydrocarbon-degrading community in the FSC that ‘stands at the ready’ to consume oil that may become entrained within the subsurface at depth in the event of a spill in this region. • First study assessing the microbial response to subsurface oil in-situ in the FSC. • Oil-degraders responded rapidly within the cold subsurface at depth (∼500 m). • Unexpectedly, psychrophilic oil-degraders Colwellia and Oleispira were not enriched. • Several new oil-degrading taxa were identified in this cold sub-Arctic region. • Diverse oil-degrading community stand primed to consume oil in the event of a spill.
Gutierrez et al. (Thu,) studied this question.