Chronological dating of high-elevation dead and dying trees on northern Vancouver Island, British Columbia
Bibliographic record
Abstract
Tree rings were analysed in order to determine the time of death for 18 moribund and dead trees of 3 species used as roosts by bats on the upper slopes (700-1500 m altitude) of Mt. Cain, northern Vancouver Island, Canada. The species were yellow cedar (Chamaecyparis nootkatensis), western hemlock (Tsuga heterophylla) and western white pine (Pinus monticola). Some 29 increment core samples were crossdated with tree-ring chronologies of living trees to estimate when the trees died. After they die, yellow cedar trees deteriorate slowly and remain standing for as long as 200 years. In contrast, few western hemlock and western white pine snags persist longer than 100 years. The ages at which the sampled trees died were highly variable, with western white pine, western hemlock, and yellow cedar exhibiting the narrowest to widest range of ages, respectively. The findings highlight the long persistence of snags in high-altitude coastal forests and the centuries of ecological service that these trees provide to snag-dependent wildlife.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| 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".