A preliminary ranking of contaminants of concern in juvenile Harrison Chinook and their habitat in the Fraser River, British Columbia.
Bibliographic record
Abstract
The Fraser River (British Columbia) was once considered one of the world’s most productive salmon rivers. This river is home to 19 Chinook populations which represent an important species not only to First Nations, recreational anglers and commercial fisheries but also to Southern resident killer whales. The Harrison River Chinook stock, which numerically dominate the lower Fraser River stocks, spend 30-50 days in the Fraser River estuary, where they feed and grow prior to entering the marine environment. This stock was selected as a focal stock due to its spawning location origin in the lower Fraser River, and because ocean type Chinook are believed to rely most heavily on estuarine habitat compared to “stream type” Chinook. The lower Fraser River and estuary is heavily impacted by many anthropogenic activities including forestry, mining, pulp and paper, wood preservation, chemical manufacturing, urban and agricultural runoff and wastewater (sewage) treatment. Despite a history of pollution inputs into the lower Fraser River and estuary, little is known about contaminant exposure and their associated health impacts in Chinook salmon. A preliminary ranking of over 600 contaminants of concern, including various pesticides, PCBs, PBDEs, flame retardants, pharmaceuticals and personal care products, and metals in Harrison juvenile Chinook and their habitat (water and sediment) was conducted. Samples were collected from three impacted sites within the estuary and two reference sites. A combination of exposure activity ratios, risk quotients, and toxicity quotients were applied across the different matrices. This initial ranking of contaminants will serve to identify those contaminants suspected of driving observed health effects in the real world that will be further explored in a field health effects study. Results from this research will be used to inform Chinook conservation, recovery, and management efforts, especially as they relate to Fraser River Chinook and Southern Resident killer whales.
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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 | 0.002 | 0.002 |
| 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) | 0.002 | 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".