Spatial patterns and competition of tree species in a Douglas‐fir chronosequence on Vancouver Island
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
While the successional dynamics and large‐scale structure of Douglas‐fir forest in the Pacific Northwest region is well studied, the fine‐scale spatial characteristics at the stand level are still poorly understood. Here we investigated the fine‐scale spatial structure of forest on Vancouver Island, in order to understand how the three dominant species, Douglas‐fir, western hemlock, and western redcedar, coexist and partition space along a chronosequence comprised of immature, mature, and old‐growth stands. We quantified the changes in spatial distribution and association of the species along the chronosequence using the scale‐dependent point pattern analyses pair‐correlation function g(r) and Ripley's L‐function. Evidence on intra‐ and inter‐specific competition was also inferred from correlations between nearest‐neighbor distances and tree size. Our results show that 1) the aggregation of Douglas‐fir in old‐growth was primarily caused by variation in local site characteristics, 2) only surviving hemlock were more regular than their pre‐mortality patterns, a result consistent with strong intra‐specific competition, 3) inter‐specific competition declined rapidly with stand age due to spatial resource partitioning, and (4) tree death was spatially randomly distributed among larger overstory trees. The study highlights the importance of spatial heterogeneity for the long‐term coexistence of shade‐intolerant pioneer Douglas‐fir and shade‐tolerant western hemlock and western redcedar.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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