The effects of age and size of canopy gaps on the mycorrhizae of yellow birch (Betula alleghaniensis Britton) and sugar maple (Acer sacchrum Marsh.) from deciduous forests of the Québec city region
Bibliographic record
Abstract
Effects of different sized and different aged canopy gaps on the ectomycorrhizae of yellow birch and vesicular-arbuscular mycorrhizae of sugar maples collected from two deciduous forests in central Quebec were examined. The colonization of maple roots by arbuscules, vesicles, and coils were quantified. Colonization by ectomycorrhizal fungi was quantified and characterized using morphotyping and molecular techniques. In the 1-yr old 1000 m 2 cuts, colonization increased in the maple roots as the season progressed. In October, there were more arbuscules in the seedlings from the gaps vs those from the uncut areas. No differences in ECM colonization between uncut and 1-year old gaps were noted in the yellow birch seedlings and high levels of colonization occurred throughout the season. In the 5- and 10-yr old gaps, colonization in both species increased as the season progressed, and higher colonization levels were present in the large (V100 m 2 ) vs small naturally occurring gaps (0-2 m 2 ). Based on morphotypes, species richness on yellow birch was unaffected by gap size and age, but diversity was slightly greater in the older gaps. Sixteen different ECM morphotypes were found, 10 of which were characterized using molecular methods, yielding 17 different restriction patterns. These results emphasize the importance of using molecular methods to back up morphological assays of ectomycorrhizal species richness.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".