Effects of soil resource and herbivory manipulation on temperate-mesic grassland vegetation under a changing climate
Bibliographic record
Abstract
Water availability is obviously a primary regulator of plant productivity and species interactions in arid ecosystems, where many previous studies have documented these effects by manipulating soil moisture availability. The impact of altered precipitation patterns — predicted as a consequence of climate change — however, is less clear for more temperate-mesic habitats. How much does variation in soil moisture availability matter here relative to other key environmental factors? To address this, we used a long-term field experiment to explore how the interaction of below-ground water and nutrient availability and above-ground herbivory, interact as regulators of neighbourhood biomass production and species composition in an old-field meadow in Eastern Ontario. After five years of soil water and nutrient level manipulation, with and without herbivore exclosures, we recorded above-ground dry biomass for each resident species within replicate plots. Analysis of treatment effects showed that community above-ground biomass increased with the addition of soil nutrients, decreased under reduced water levels, and was unaffected by increasing water levels or the presence of herbivore exclosures. By Contrast, species richness was altered by all applied treatments with the soil water level manipulations having the greatest effects. The soil nutrient manipulation induced changes in diversity consistent with the traditional ‘humped-back’ model, which predicts a unimodal relationship between productivity and diversity, but the soil moisture manipulation did not. Body size metrics (i.e. maximum potential body size or minimum reproductive threshold size) did not predict species biomass representation under any of the experimental manipulations. However, the biomass of the three most dominant plant species — each of agricultural and ecological significance — was altered by the soil resource manipulations. These results suggest that future precipitation regime changes are likely to negatively impact eastern Ontario’s native grassland plant species and its economically valuable hay and pasture lands. Furthermore, they challenge conventional theory regarding plant body size and competition and the relationship between productivity and diversity along gradients of soil moisture availability versus soil nutrient availability.
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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 | 0.001 |
| 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".