Detecting the phylogenetic signal of glacial refugia in a bryodiversity hotspot outside the tropics
Bibliographic record
Abstract
Glacial refugia have likely been important in shaping diversity gradients outside the tropics. However, the biogeographical histories of most species within glacial refugia remain unclear. In this thesis, I examine the geographic range structure and phylogenetic attributes of the mosses of Haida Gwaii, a putative glacial refugium and ‘hotspot’ of moss diversity off the northwest coast of British Columbia. I show that many species have widespread, but disjunct distributions, typically with few close relatives on the islands. I suggest that these features reflect the imprint of glacial history, whereby species within refugia represent isolated populations of previously more widespread species that may have diversified elsewhere. The phylogenetic dispersion of species within high elevation habitats, which best match the climatic regime of the historical glacial refugium, is consistent with the filtering of evolutionarily distinct glacial relicts, and contrasts markedly with the patterns of phylogenetic clustering observed across other habitat types. My study illustrates how the present-day phylogenetic structure of species composition and diversity can reveal the signal of glacial refugia, and help explain why some taxa are more diverse outside of the tropics.
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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".