Exploring Seasonal Variation of Liver and Muscle Mercury in a Freshwater Sport Fish, Lake Trout (Salvelinus namaycush)
Bibliographic record
Abstract
Mercury (Hg) is a contaminant that reaches elevated concentrations in fish, posing a threat to human health. Hg in fish varies widely among populations and species; however, the influence of seasonal dynamics in temperate fish feeding ecology, behaviour, and physiology on their Hg concentrations is unexplored. We investigated whether liver and muscle Hg varied seasonally in a freshwater sportfish, lake trout (Salvelinus namaycush), in two lakes and two consecutive years. We foundthat Hg varied seasonally in muscle, but liver Hg was variable and did not display consistent seasonal patterns. Fork length, liver C: N and, in some models, δ15N (trophic position), were predictors of liver Hg, but not sex or δ13C (habitat use). 44% of fish captured had muscle Hg that exceeded Health Canada commercial consumption guidelines. Our findings shed light on temporal dynamics of fish Hg and suggest that consumption advisories should consider seasonal variability of Hg concentrations in temperate freshwater fishes.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 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".