Intraspecific trait variability in four geographically widespread peatland plant species in Canada
Why this work is in the frame
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Bibliographic record
Abstract
Plant traits directly influence ecosystem carbon exchange through photosynthesis and respiration, and indirectly control nutrient cycling through structural and chemical characteristics. Efforts to understand the role of plant traits in peatland ecosystem functioning under natural and disturbed conditions have primarily focused on community and species means. However, within-species (‘intraspecific’) variability may contribute to plant and ecosystem responses to environmental change. We measured vascular plant traits that influence carbon and nutrient cycling: leaf size (LS), specific leaf area (SLA), leaf dry matter content (LDMC), leaf thickness (L th ), and plant height. For non-vascular Sphagnum moss species, we focused on traits associated with the capacity to carry water and photosynthesize: fascicle density (FD), capitulum mass (M cap ), and length-specific stem mass (M stem ). Our objective was to determine the range and potential drivers of intraspecific trait variation (ITV) at a broad environmental scale. We selected geographically widespread species Carex aquatilis, Rhododendron groenlandicum, Sphagnum fuscum , and S. magellanicum complex and sampled plants from 17 sites within Canada, from Alberta to Quebec. All vascular traits varied between species with C. aquatilis being, on average, taller with thinner and larger leaves but similar structural investment (LDMC) relative to R. groenlandicum . Across all sites, R. groenlandicum had a larger range of variation for height and LS whereas C. aquatilis ranged more in LDMC. Between sites, R. groenlandicum varied more in height whereas C. aquatilis varied more in SLA. Moss traits varied between species, with S. fuscum being, on average, smaller with greater FD than S. magellanicum complex. Across all sites, S. fuscum and S. magellanicum complex had a similar range in trait variation, but contrasting responses in ITV to climate, geography, and vapour pressure deficit. Climatic differences among sites are indicated as potential drivers of ITV in these key plant traits, with implications for ecosystem carbon and nutrient cycling.
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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) | 0.001 | 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