Mercury, sulfur-metabolizing bacteria and organic matter in the sediments of subarctic Kusawa Lake, Yukon.
Bibliographic record
Abstract
Recent studies of Arctic and Subarctic environments have detected rising levels of natural and anthropogenic mercury (Hg), putting northern residents at risk for Hg exposure.W ithin lake sediments, Hg can be methylated by certain species of Sulfate-Reducing Bacteria (SRB), a subset of Sulfur-Metabolizing Bacteria (SMB).This research assessed the controls of Subarctic SRB Hg-methylation in proglacial Kusawa Lake, Yukon, Canada.Kusawa was found to be oligotrophic, with very low primary productivity and an orthograde oxygen profile, conditions that inhibit Hg-methylation.In addition, the SMB proportion of total bacteria was small (1 .9x l0 '3 %), no known SRB Hg-methylators w ere detected, the total Hg sediment concentration was 0.022 ± 0.0009 p,gg-1 (±SE) and methylm ercury was undetectable.The results support previous research that suggests the factors influencing SRB Hg-methylation in Kusawa Lake are: (i) the rate of algal-derived Hg-scavenging, (ii) the sediment concentration of total Hg and (iii) the diversity of sediment SRB.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| 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".