High synchrony in size at maturity of Atlantic salmon over a large geographical scale
Bibliographic record
Abstract
Size at maturity is an important demographic characteristic due to its effect on fecundity. Synchrony in size at maturity across populations suggests similar environmental conditions, mainly through shared feeding grounds. We study such synchrony over 30 years across 187 populations using data from about 200 000 individual Atlantic salmon belonging to four geographic regions in Norway. Synchrony was high among the three southern regions, while the northernmost region had more independent fluctuations. Synchrony among closely separated populations was high, declined with distance, but was still present more than 1000 km apart. In all regions, the general pattern was that size at age was largest in the late 1980s and around 2000 and smallest between 2005 and 2010. Fulton’s condition factor was consistently largest in the North region. Overall, our results are consistent with the known marine distribution, including that the northernmost populations have a reduced migration distance to feeding areas and forage more northeast than the southern populations. The observed synchrony in size at maturity is anticipated to have large-scale demographic consequences by generating synchrony in egg deposition.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".