Effects of Suspended Sediment on the Escape Behavior and Cover‐Seeking Response of Juvenile Chinook Salmon in Freshwater
Bibliographic record
Abstract
Abstract In laboratory experiments, we quantified the innate adaptive escape behavior and cover‐seeking response of juvenile Chinook salmon Oncorhynchus tshawytscha exposed to elevated levels of turbidity and suspended sediments for a duration predicted to elicit sublethal effects. Treatment fish were held for 48 h at 10°C in a sediment slurry (30,000 mg/L; 50,000 nephelometric turbidity units [NTU]) made up of about 46% clay (<0.002 mm), 46% silt (<0.053 and >0.002 mm), and 8% fine sand (<2.00 and >0.053 mm). The behavioral response of individual control and treatment fish was then examined in clear water (1.9 NTU) through the use of a performance challenge test. Challenge tests can determine the sublethal effects of contaminants on an organism's ability to adapt and survive in its environment. The behavioral avoidance response was characterized as the amount of time in which individual fish swam out of the field of view and sought cover. The tendency of fish to escape to shelter, the time to swim from an open, well‐lit space into shade beneath overhead cover, and the trajectory of each escape response were recorded by a video camera coupled to a digital recorder. The ability of sediment‐exposed Chinook salmon to escape to cover was impaired relative to that of control fish: There was a significant increase in stuporous behavior and a significant reduction in cover‐seeking response in the sediment‐exposed fish. Treatment fish were slower to seek cover from intense light and displayed erratic swimming behavior. These results suggest that even a relatively brief (48‐h) exposure to elevated levels of suspended sediment could indirectly jeopardize survival in the wild, as such overt performance and behavioral changes would probably render juvenile Chinook salmon more conspicuous and therefore more susceptible to avian and aquatic predators.
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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".