Ecological advantage of leaf heteroblasty in <i>Costus pulverulentus</i> (Costaceae)
Bibliographic record
Abstract
Leaf heteroblasty is a plant phenomenon related to leaf development that describes substantial differences between temporally separated plant stages. This study explores the ecological advantage of leaf heteroblasty in the herb Costus pulverulentus C.Presl and analyzes its possible adaptive value. Heteroblasty was studied using leaf morphology analysis and characterizations of leaf area, specific leaf area (SLA), and leaf divergence angles along the crown. A light capture efficiency index (STAR) was also used by simulating plants with only top- or basal-leaf forms to test its adaptive value. Morphological analysis indicated that C. pulverulentus develop two leaf forms: basal leaves with an obovate form, and top leaves with an oblanceolate form. Mid-crown leaves showed a reduced SLA and angles of divergence, and an increased area compared with top and lower leaves, which may indicate greater space utilization for light acquisition. Plants with top-leaf forms showed greater STAR than plants with basal-leaf forms, likely due to lower self-shading and lower crown density produced by leaf arrangements. Results of this study suggests that changes in leaf size and morphology occur in later stages of plant development as an adaptation to reduce self-shading and crown density which promotes an adaptive advantage by increasing the STAR.
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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 | 0.000 |
| 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 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".