Décalage temporel dans l’établissement des érables en forêt boréale révélé par une population marginale à la limite nordique de l’érable à sucre
Bibliographic record
Abstract
Given their position at the limit of a species’ bioclimatic tolerance envelope, range-edge populations are particularly sensitive to variations in environmental conditions. Understanding ecological history of such peripheral populations provides key insights about ecosystem responses and resilience to global change. Here, we rely on soil macrofossil charcoal analysis to infer the origin and dynamics of a marginal sugar maple stand located within the boreal forest, at the leading edge of the species range. Radiocarbon dating of sugar maple and red maple charcoal particles indicates a late origin of the sugar maple stand at c. 600 cal yr BP, compared to red maple, which was established in the early Neoglacial period c. 4000 years ago. The earlier presence of red maple may have facilitated a later establishment of sugar maple in the boreal environment, most likely by altering edaphic conditions. The relatively recent establishment of a disjunct stand of maple at its current leading edge suggests that models predicting a northward migration of temperate species to the boreal biome in response to contemporary climate change are empirically plausible.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".