Age-specific Variation in Trophic Niche Overlap of Dovekies Alle Alle
Bibliographic record
Abstract
Stable isotope ( 15 N, 13 C) analysis of primary feathers and muscle tissue of Dovekies Alle alle collected on Newfoundland beaches following an oil spill in early winter 2004 were used to investigate age-related variation in trophic niche during summer, fall and early winter.Observed 15 N values of adults were significantly higher than those of sub-adults during fall moult and hatch-year birds during summer.Strong segregation of 13 C and 15 N values of hatch-year birds into two distinct groups during summer may indicate differences in the colony of origin.Similarly, a wide range of 13 C values for adult and sub-adult Dovekies during fall may indicate differences in moulting areas.In early winter, the 13 C values of all age classes overlapped, with relatively depleted 13 C values (-20.0 0.4) characteristic of offshore waters.Age-class overlap in 15 N values (+12.2 0.4) likely reflects a common diet of Calanus finmarchicus, the most abundant copepod in near-surface waters on the Newfoundland-Labrador shelf in winter.Our results suggest that Dovekies from different age classes and potentially breeding regions overlap on their wintering grounds where they rely on a common Calanus prey.Consequently, future climate-driven shifts in the meso-zooplankton communities in the North Atlantic have potentially large-scale population consequences for this abundant planktivore.
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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 | 0.000 |
| 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) | 0.006 | 0.001 |
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".