Methylmercury Cycling at the Aquatic-terrestrial Interface in a High Arctic Freshwater Continuum
Bibliographic record
Abstract
Methylmercury (MeHg) is a global toxin which bioaccumulates and biomagnifies through food webs. To discern how MeHg enters Arctic food webs, it is important to understand spatial and seasonal cycling of MeHg at the terrestrial-aquatic interface, processes which are sensitive to climate change. This research determined hotspots of MeHg production and degradation in a High Arctic freshwater continuum, and how these processes varied between ice-on and ice-off conditions. Different compartments of the Skeleton Continuum of Lake Hazen, Nunavut were sampled to capture variation in MeHg production and degradation. Examining interconnectedness of the landscape revealed that production hotspots occur in multiple compartments (lake/pond sediments, pore water), yet downstream degradation hotspots and storage (lake water, wetland soils) prevent MeHg from entering the downstream system. Additionally, high MeHg concentrations found in the springtime (water column, snow) solidify the theory that spring freshet is an important source of MeHg to freshwater systems.
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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 | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".