An alpine plant shows no decrease in genetic diversity associated with rapid post‐glacial range expansion
Bibliographic record
Abstract
PREMISE: While range expansion is hypothesized to be a mechanism for species persistence under climate change, many eco-evolutionary models describe demographic and genetic processes during expansion that may increase genetic drift, decrease genetic variation, and ultimately decrease relative fitness at the leading edge. These predictions assume dispersal occurs from the low-density leading edge during colonization, common in post-glacial expansion at the continental scale (~20,000 years ago), but relatively understudied on contemporary timescales, like alpine glacier recession since the end of the Little Ice Age (~150 years ago). METHODS: We use the native alpine plant Erythranthe (Mimulus) lewisii to quantify neutral genetic diversity (single nucleotide polymorphisms) and infer signatures of genetic drift across two contemporary instances of range expansion on alpine glacier forelands in Garibaldi Provincial Park, BC, Canada, by testing for the presence of signatures of increased genetic differentiation and decreased genetic variation toward the contemporary range edge relative to the historical range core over space and time. RESULTS: We find weak support for the prediction of increasing genetic differentiation toward the range edge, and no support for decreasing genetic diversity toward the range edge. This suggests dispersal occurring primarily from the leading edge is not characterizing colonization, with the implication that potential relative reductions in range-edge fitness due to range expansion as predicted by theory are likely not applicable in nature at this spatiotemporal scale. CONCLUSIONS: Together, our results suggest that demographic dynamics of colonization following alpine glacier retreat do not result in the loss of genetic diversity over space and time.
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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) | 0.000 | 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".