Exploring trophic dynamics and fish condition during autumn to understand the lack of recovery of groundfish in southern Newfoundland
Bibliographic record
Abstract
Following collapses in the 1990s, many Northwest Atlantic groundfish stocks have not recovered despite reduced fishing pressure. This leads to a key question in fisheries ecology today: Why do some stocks not recover? I address this question via analyses of condition, diet, and trophic dynamics of groundfish within Northwest Atlantic Fisheries Organization (NAFO) subdivision 3Ps. The first chapter introduces the research themes with seasonality highlighted and state of knowledge relevant to two subsequent research chapters. The second chapter uses diet and triple-stable isotope analysis (δ15N, δ13C, and δ34S) to quantify seasonal differences in southern Newfoundland Atlantic Cod (Gadus morhua) diets and condition. I report differences in both seasonal and ontogenetic patterns within this southern Newfoundland stock in condition, diet, and stable isotope values. Chapter 3 incorporates a multispecies approach using similar methods to chapter 2 alongside stable isotope mixing models to identify pre-winter trophic interactions within the southern Newfoundland groundfish community. Ontogenetic isotopic niche overlap among various species indicates potential size dependent competition among southern Newfoundland species during the autumn. This research provided pre-winter physiological condition of Atlantic cod and the trophic interactions among the groundfish community within the autumn in southern Newfoundland and supports seasonal variation among the trophic structure within southern Newfoundland that may help identify oceanographic change related productivity shifts within the ecosystem.
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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 | 0.001 | 0.001 |
| 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) | 0.001 | 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".