The relative importance of competition for two dominant grass species as affected by environmental manipulations in the field
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Bibliographic record
Abstract
AbstractWe examined how shade, drought and disturbance influenced the intensity and relative importance of competition experienced by Bromus erectus and Brachypodium pinnatum, the two dominant species of a calcareous grassland. Competition was intense in all treatments for both species, but its importance differed substantially. Competition was not important for Brachypodium when the drought was severe. Shade had a strong positive effect on Brachypodium by decreasing water stress. Bromus was more tolerant of drought and disturbance than Brachypodium, but was more inhibited by competition, which was important in all environmental conditions. Differences in the relative importance of competition for Bromus and Brachypodium, and variation in the effects of the environment, may explain the dominance of Bromus in conditions of high stress and disturbance and its exclusion in mesic grasslands. We suggest that the debate on how competition varies along productivity gradients may be due to the focus on competition intensity, which is highly dependant on particular target species and study systems, rather than on the relative importance of competition in different conditions.RésuméNous avons mesuré les variations d’intensité et d’importance relative de la compétition subies par Bromus erectus et Brachypodium pinnatum dans une pelouse calcicole à haut et bas niveaux d’ombrage, de sécheresse et de perturbation. La compétition était intense dans tous les traitements, mais son importance différait selon l’espèce. La compétition ne s’est pas avérée importante pour le brachypode dans les lots de sécheresse intense. Par contre, l’ombrage a eu un fort effet positif sur le brachypode en modifiant les disponibilités en eau et en nutriments. Le brome s’est montré plus tolérant à la sécheresse et à la perturbation que le brachypode, mais il était fortement affecté par la compétition. Les différences d’importance relative de la compétition pour le brome et le brachypode et les effets de l’environnement permettent d’expliquer la dominance du brome en conditions de contrainte hydrique et de forte perturbation, ainsi que son exclusion des prairies mésiques. Nous pensons que les résultats des études expérimentales concernant les variations de compétition le long de gradients de productivité sont difficiles à interpréter, car jusqu’à ce jour, les auteurs se sont surtout concentrés sur l’intensité de la compétition, fortement dépendante des espèces cibles et des systèmes d’étude, plutôt que sur l’importance de la compétition.Keywords: Brachypodium pinnatumBromus erectusCompetitionDroughtMowingShadeMots-clés: Brachypodium pinnatumBromus erectusCompétitionFaucheOmbrageSécheresse
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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 | 0.001 | 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 it