<i>Bromus inermis</i>invasion of a native grassland: diversity and resource reduction
Bibliographic record
Abstract
Invasion-driven diversity reduction is often attributed to decreased resource availability, but this has rarely been examined. We tested whether the invasion of native grassland by the introduced grass, Bromus inermis, was associated with reduced diversity, increased standing crop (including roots), and decreased resource availability. Diversity and evenness were significantly lower in invaded stands, but richness was not significantly different. Both shoot and root mass were significantly greater in B. inermis stands, suggesting that resource demand should be higher. Light penetration and soil moisture were significantly lower beneath B. inermis. In contrast, most nutrients (including available N) did not vary between vegetation types. Some nutrients (P, K, Ca, and Mn) were significantly more abundant beneath B. inermis, possibly reflecting the invader’s tendency to invade lower landscape positions. Overall, the results are consistent with invasion-driven diversity reduction being caused by increased resource demand and decreased availability of light and water.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), 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".