Latitudinal Dispersal of Southern North American Glacial Refugial Plants within Yukon, Canada
Bibliographic record
Abstract
This study investigates the distribution of southern North American glacial refugial migrants that have invaded Yukon (Canada) since the Last Glacial Maximum (LGM), which began about 9500 years ago. The analysis was based on indigenous vascular plant occurrences that were stratified according to 0.33˚ latitudinal bands. Among 90,397 occurrence records, about 37% were postglacial migrants as opposed to former members of the Eastern Beringian flora. Most migrants probably moved northward from LGM refugia in the western U.S. region (Montana-Idaho-Wyoming) and, to a lesser extent, from the midwestern United States, but several were potentially from a Pacific coast refugium in westernmost Washington-Oregon-northern California. Gradients in taxa composition and richness occurred, with Beringian taxa increasing and migrant taxa decreasing at greater latitudes (+3 vs −0.5 taxa per degree, respectively) based on statistically significant regression trends. An interpretation of ordination results based on taxa presence and absence suggests south-to-north migrating plants are strongly influenced by climate. Only half of all Yukon migrant taxa have geographical ranges that extend beyond the latitudinal centre of the territory. Possible constraints on greater dispersal include competition from pre-existing vegetation, colder northward climates, and the presence of the Ogilvie and Wernecke Mountains across the latitudinal centre of the territory. Just over half (24 of 44) of the taxa that occurred in only one latitudinal band were located immediately north of the southern Yukon border, which suggests glacial refugial migrants are still invading Yukon.
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How this classification was reachedexpand
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) | 0.002 | 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 teacher head, 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".