Newfoundland and Labrador Shelf ecosystem dynamics post cod collapse
Bibliographic record
Abstract
In highly dynamic systems, a key challenge of modern fisheries management is to promote ecosystem and stock health in the face of fishing pressure combined with environmental and ecological perturbations. Failing to account for changes in ecosystem productivity or structure can result in overexploitation that, when left undetected, can severely limit the ability of an ecosystem or stock to recover. Here, we evaluate the dynamics of the Newfoundland and Labrador Shelf ecosystem following the groundfish collapse of the early 1990s. Using data from an annual bottom trawl survey, we analyzed ecosystem structure across space and time. The past 3 decades have been characterized by shifting ecosystem structure across the Shelf, from invertebrate-dominated to groundfish-dominated. Total ecosystem biomass remains far below pre-collapse levels and spatial heterogeneity of species distribution has increased. Several factors, including system productivity and prey availability, are explored for their role in the decoupling of ecosystem biomass and community composition. Measures of ecosystem structure and productivity have important fisheries and management implications when determining appropriate reference points and harvest control rules. Our study demonstrates the importance of considering ecosystem-scale processes to sustainably manage fisheries.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| 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".