Diet and stable isotope signatures of Atlantic sturgeon (Acipenser oxyrinchus) caught in Minas Basin, Bay of Fundy, and the Saint John River, Canada
Bibliographic record
Abstract
The feeding habits of Atlantic sturgeon Acipenser oxyrinchus (AS) juveniles and sub- adults from Minas Basin (MB), and adults taken during their spawning run in the Saint John River (SJR) were investigated by stomach content and stable isotope analysis. While the diet of AS from MB was mainly composed of Corophium volutator (% index of relative importance = 98.6 %), the stomachs collected from the specimens caught in the SJR were empty. In SJR AS, no correlation was found between δ 15 N and C:N ratios suggesting that lipid reserves satisfy energy costs related to the spawning run. Trophic positions (TP) were estimated using isotopic data of C. volutator as the food web baseline for the region. Blood isotopic data indicated that SJR AS occupied a higher TP than MB AS (3.9 ± 0.3 and 3.7 ± 0.1, respectively), whereas the opposite was indicated by muscle data (4.0 ± 0.2 for SJR AS, and 4.5 ± 0.1 for MB AS). Isotopic niche areas estimated by standard ellipse areas and kernel utilization density analyses indicated that MB AS had a more diverse diet than SJR AS. There was no isotopic niche overlap between MB AS and SJR AS indicating that the two groups had distinct feeding grounds. These findings are directly relevant to the conservation and management of the AS, providing critical empirical data to support ecosystem-based models, particularly in the Bay of Fundy and Saint John River regions.
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How this classification was reachedexpand
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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.002 |
| 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 teacher head, 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".