Microbial community characterization of produced water and surrounding seawater from oil and gas production platforms in Eastern Canada
Bibliographic record
Abstract
Produced water is the largest volume of waste produced during the recovery of oil from offshore oil and gas production platforms, and is discharged directly into the surrounding marine environment.Emerging evidence suggests that offshore produced water discharges impact biota at significant distances from the point of discharge.The objectives of this study were to characterize the marine bacterial and/or archaeal populations in and around the Hibernia, Terra Nova and Thebaud production platforms, to determine if changes in the bacterial community structure might be related to the influence of the produced water, and to develop molecular methods to monitor the bacterial community structure in seawater and to track the dispersion of produced water.The marine bacterial community structure remained relatively constant (with S AB > 70%) across large distances (up to 50 km away from the platforms) and throughout several years of sampling, suggesting that the produced water discharge did not have a detectable effect on the surrounding seawater.Bacteroidetes, Alpha-proteobacteria, and Gamma-proteobacteria were the most common and abundant phyla detected in the northwestern Atlantic Ocean.The only effect potentially related to the input of produced water was found on the sediment close to the Thebaud platform, suggesting that any impact might be restricted to a small area at the sediment level adjacent to the discharge.Firmicutes was the most common and dominant phylum detected in all three produced waters, represented principally by species of Thermoanaerobacter. Both species-specific detection methods (Q-PCR and nested-PCR) detectedThermoanaerobacter in surrounding seawater within 1000 m of the production Thermoanaerobacter.Deux méthodes moléculaires spécifiques à l"espèce (Q-PCR et PCR-niché) ont pu détecter Thermoanaerobacter dans l"eau de mer dans un rayon de 1000 m des plateformes de production, mais la majorité des Thermoanaerobacter trouvés à 100 m d"Hibernia se situait au bas de la colonne d"eau, avec seulement une petite quantité migrant plus haut dans la colonne.Les propriétés de l"eau de production et les modèles existants supportent également le profil de dispersion pour l"eau de production.Cette étude rapporte la première caractérisation de la diversité microbienne aux abords de trois plateformes côtières de production de pétrole et gaz de l"est du Canada et le développement de nouveaux outils moléculaires pour retracer et suivre la libération de l"eau de production.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".