Body mass variation in Marbled Murrelets in British Columbia, Canada
Bibliographic record
Abstract
Body mass was measured in Marbled Murrelets Brachyramphus marmoratus from May to August, 1994–1998 at Desolation Sound, and during June and July 1997 at Mussel Inlet, British Columbia, Canada, to assess seasonal, sexual, site and intra‐annual variation. Birds were captured by mist‐net, and by night‐lighting, and were sexed using molecular techniques. The breeding status of females (gravid or not) in 1997 was determined from plasma levels of egg‐yolk precursors. Adult males weighed 203.7 ± 14.8 g, n = 495 (juveniles 166.6 ± 28.8 g, n = 31) and females weighed 201.2 ± 20.5 g, n = 344 (juveniles 148.3 ± 23.5 g, n = 20). Murrelets caught in mist‐nets were significantly lighter than those caught by night‐lighting. Female mass was constant across years of the study, but males caught by night‐lighting were heavier in 1998 than in 1997. Females declined in mass during the egg‐laying period, but when gravid females were removed from the analysis, or when the post‐laying data were analysed, no declines were found. Marbled Murrelets appear to maintain mass at a constant level all season, and are probably more income than capital breeders. Variation in body mass in this species may be constrained by the need to fly with speed and agility to avoid aerial predators.
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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 | 0.001 |
| 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) | 0.002 | 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".