Stand density in the last millennium at the upper tree-line ecotone in the Polar Ural Mountains
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Significant spatiotemporal changes in the establishment, mortality, and abundance of trees have taken place in the upper tree-line ecotone in the Polar Ural Mountains over the last millennium. Until now, these forests have developed mainly under the influence of natural factors. A large number of well-preserved tree remains can be found up to 6080 m above the current tree line, some dating to as early as a maximum of 1300 years ago. The research reported here extends the work begun by S.G. Shiyatov, who examined evidence of tree growth dynamics along a transect on the eastern slope of the Polar Ural Mountains in the 1960s. For this study, 769 discs from dead trees and 378 increment cores from living trees were collected along an altitudinal transect 860 m long and 80 m wide. The positions of all living trees, fallen dead trees, and wood remains were mapped. Dimensions of each living tree, including saplings and understory plants, were measured: basal diameter, diameter at breast height, crown diameter, and height of stems. Calendar years of tree germination and death were estimated using dendrochronological techniques. The earliest distinct maximum in stand density occurred in the 11th to 13th centuries, coincident with Medieval climate warming. Climate warming in the 18th century appears to have resulted in a second stand-density maximum. The recent temperature increase observed in the 20th century is reflected in the high number of young trees observed.
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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 | 0.006 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 it