Coévolution de la végétation et des régimes de feux en réponse aux principaux épisodes climatiques rapides du dernier millénaire, au niveau de deux lacs situés dans la pessière à mousse de l’est du Québec
Bibliographic record
Abstract
The boreal forest of eastern Quebec, located in the Northern Hemisphere, is characterized by a humid climate, a low frequency of fires, but with generally high intensity when they do occur. Since this region remains relatively understudied, our objective is to reconstruct vegetation dynamics in relation to variations in climate and fire regimes during the rapid climate events of the last millennium. These analyses are based on two lakes located west of the Côte-Nord region, within the black spruce–moss bioclimatic domain: Lake Rosette and Lake 6. Prior to the changes induced by these rapid climate events, the landscape was largely dominated by black spruce and birch. The joint analysis of fire regimes and vegetation highlights several general trends. During the Medieval Climate Anomaly (1,050–700 cal. BP), temperatures increased, accompanied by low fire activity and a greater colonization by deciduous species. During the Little Ice Age (750–150 cal. BP), temperatures dropped significantly, while fires became more frequent and intense, promoting the coniferization of the landscape. Finally, during the pre-industrial warming (100–74 cal. BP), fire activity reached a minimum, while deciduous taxa and herbaceous plants experienced a progressive expansion. However, a divergence is observed between the two lakes due to the proximity of the Gulf of St. Lawrence, particularly for Lake 6, which benefits from wetter conditions than Lake Rosette. This difference in moisture directly influences the fire regime. The drier conditions at Lake Rosette favor larger fires and greater burned biomass, whereas the increased humidity at Lake 6 leads to smaller but more frequent fires. These contrasts result in differences in vegetation dynamics. At Lake Rosette, vegetation remains dominated by fire-tolerant boreal taxa, primarily black spruce. At Lake 6, black spruce occurs in lower proportions and is associated with birch, a more thermophilous species, as well as balsam fir, which is poorly adapted to large-scale fires.
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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 | 0.001 | 0.001 |
| 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) | 0.002 | 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".