Social Complexity and Food Systems at Altun Ha, Belize: The Isotopic Evidence
Bibliographic record
Abstract
This study reports stable carbon-isotope ratios for both bone collagen and apatite, and nitrogen-isotope ratios for bone collagen for 72 Maya skeletons from 9 zones representing contrasting status groups at Altun Ha, Belize. The sample spans the Preclassic to Postclassic periods, approximately 800 B. C. to after A. D. 950. Although Altun Ha has a maize-based (C-4) diet, it has a much stronger marine/reef component than any other Maya site studied so far. Two possible dedicatory burial groups are dietarily distinct. The source of protein appears to have been fairly stable throughout the site sequence, but a marked shift to reduced consumption of C4 foods seems to have occurred after the Early Classic period. A second similar decline probably occurred between the Late/Terminal Classic and the Postclassic periods. These apparent temporal trends may, however, be confounded by differences between zones. High status is marked by consumption of large quantities of C4 foods, possibly including C4-fed terrestrial animals. Males consumed more meat and C4 foods than did females. All δ-values and collagen-apatite spacings indicate that children were breastfed until at least the age of three or four.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| 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".