Assessing Changes in Age and Size at Maturation in Collapsing Populations of Atlantic Cod (Gadus Morhua)
Why this work is in the frame
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Bibliographic record
Abstract
By estimating probabilistic reaction norms for age and size at maturation, we show that maturation schedules\nof Atlantic cod (Gadus morhua) off Labrador and Newfoundland shifted toward earlier ages and smaller sizes during\nthe late 1980s and early 1990s, when these populations underwent a severe collapse in biomass and subsequently were\nclosed for directed commercial fishing. We also demonstrate that this trend towards maturation at younger ages and\nsmaller sizes is halted and even shows signs of reversal during the closure of the fisheries. In addition, our analysis\nreveals that males tend to mature earlier and at a smaller size than females and that maturation age and size decrease\nwith increasing latitude. Importantly, the maturation reaction norms presented here are robust to variation in survival\nand growth (through phenotypic plasticity) and are thus strongly indicative of rapid evolutionary changes in cod maturation\nas well as of spatial and sex-specific genetic variation. We therefore suggest that maturation reaction norms can\nprovide helpful reference points for managing harvested populations with evolving life histories.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 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) | 0.000 | 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 it