Territory structure, parental provisioning, and chick growth in the American Black Oystercatcher Haematopus bachmani
Why this work is in the frame
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Bibliographic record
Abstract
We investigate parental food provisioning and chick growth to better understand how parental effort and territory structure relate to reproductive success in the American Black Oystercatcher. American Black Oystercatcher chick diet was comprised mainly of limpets. Most prey items were 20 mm or shorter in length. Provisioning rates (kJ h-1) were significantly correlated with mean delivery rates rather than mean prey size, and higher provisioning rates resulted from a greater number of deliveries of small prey items. Provisioning rates were extremely variable among pairs but increased significantly with brood size and brood age. Larger brood sizes occurred more frequently on shallow sloped territories, therefore provisioning rates were significantly higher on shallow sloped than steep sloped territories. Provisioning rates appeared to decrease with increasing intertidal slope, a trend significantly supported by the growth patterns of the slow-growing chick in multi-chick broods. The effect of intertidal slope became more important when chicks were older and demand was higher, with parents occupying shallow territories achieving higher provisioning rates to older chicks relative to parents on steep territories. We discuss the hypothesis that American Black Oystercatcher parents adjust parental effort with respect to territory quality and propose possible parental adjustment mechanisms.
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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 | 0.000 | 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) | 0.000 | 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 it