Age-specific Variation in Trophic Niche Overlap of Dovekies Alle Alle
Bibliographic record
Abstract
Age-specific variation in trophic niche overlap of Dovekies Alle alle.Marine Ornithology 42: 17-22.Stable isotope (δ 15 N, δ 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 δ 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 δ 13 C and δ 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 δ 13 C values for adult and sub-adult Dovekies during fall may indicate differences in moulting areas.In early winter, the δ 13 C values of all age classes overlapped, with relatively depleted δ 13 C values (-20.0 ± 0.4‰) characteristic of offshore waters.Age-class overlap in δ 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 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 | 0.000 |
| 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) | 0.001 | 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".