Deadwood and saproxylic beetle diversity in naturally disturbed and managed spruce forests in Nova Scotia
Why this work is in the frame
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Bibliographic record
Abstract
Even-age industrial forestry practices may alter communities of native species. Th us, identifying coarse patterns of species diversity in industrial forests and understanding how and why these patterns diff er from those in naturally disturbed forests can play an essential role in attempts to modify forestry practices to minimize their impacts on native species. Th is study compares diversity patterns of deadwood habitat structure and saproxylic beetle species in spruce forests with natural disturbance histories (wind and fi re) and human disturbance histories (clearcutting and clearcutting with thinning). We specifi cally examine how beetle diversity diff ers in relation to disturbance history and how beetle variation is linked to the diversity of deadwood habitats. Beetle and deadwood data were collected from thirty spruce forests in Nova Scotia and analyzed under three related diversity perspectives: alpha (diversity within local forests); beta (heterogeneity among local forests within disturbance classes); and gamma (cumulative species richness within disturbance classes). Few data support a prediction of lower alpha deadwood and beetle diversity in managed forests, or a prediction of lower gamma species richness in managed forests. Th e beta scale analysis yielded support for the following two hypotheses: (1) beetle assemblages are diff erent in forests with diff erent disturbance histories; (2) turnover of beetle assemblages is higher among naturally disturbed forests than among managed forests. Th e prediction of lower gamma diversity of saproxylic beetle species in managed forests compared to naturally disturbed forests was not supported. Th e lack of diff erences between naturally disturbed and industrial forests in structures that are characteristic of older forests (e.g., large-diameter deadwood) may relate to the presence of residual deadwood in second growth forests lingering from before clearcut harvesting. However, such residual deadwood is only an artifact that will soon decay and not be replaced. Th is suggests that the continuity of deadwood microhabitats for species that depend on old-forest structures is only short-term.
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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 it