Diet composition and breeding success in a threatened Pacific seabird, the marbled murrelet (Brachyramphus marmoratus)
Bibliographic record
Abstract
Poor reproductive success due to changes in feeding conditions at sea has been identified as a potential cause of range-wide declines in abundance of marbled murrelets, but the mechanisms involved remain poorly understood. To evaluate two hypothesized mechanisms by which diet quality might influence reproductive success, murrelets and their prey were captured during the breeding seasons of 2007 and 2008 in Desolation Sound, BC. Vitellogenin from blood plasma of murrelets was used to estimate timing of breeding, and stable-carbon and -nitrogen isotopes from murrelet and prey tissues were used to estimate diet composition. Contrary to predictions of the hypothesis that pre-breeding trophic feeding level positively influences female body condition and timing of breeding, adult females feeding at a lower trophic level prior to breeding in 2007 were in better condition and more likely to produce an egg early in the season, but this result was not consistent among years. In accordance with predictions of the hypothesis that diet quality during development positively influences juvenile growth and body condition, juveniles feeding on higher quality prey were larger and in better condition. These results suggest that feeding conditions may influence reproductive success of marbled murrelets through effects on both adults and juveniles.
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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 | 0.000 |
| 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 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".