Impact de pommes de terre résistantes au doryphore sur les arthropodes non visés : une méta-analyse des facteurs possiblement e
Bibliographic record
Abstract
The relatively high specificity of transgenic plants based on Cry toxins of Bacillus thuringiensis (Bt) implies the possibility of upward agroecosystemic cascades toward new equilibria among arthropods associating with cultivated plants. We examine the hypothesis that exclusion of the Colorado potato beetle from potato expressing the Cry3a toxin increases the abundance of non-target herbivores, which indirectly favours the abundance of herbivore-dependent predators and omnivores foraging on agricultural plants. We examined the impact of Bt potato on non-target arthropod taxa, based on impact studies conducted during development of the Newleaf® Bt potato in North America. Of 32 field tests comparing Bt potato to non-transgenic controls, 14 (42%) revealed a significant, positive effect on the abundance of sucking insects (aphids, leafhoppers, mirids, thrips). Among 72 tests on generalist predators that were simultaneously monitored, 14 (~20%) also revealed significant positive effects. Such positive effects on predators can best be explained by their abundance being increased as a result of greater productivity due to overabundance of sucking insect prey, which are selectively favoured by the high specificity of the Cry3a Bt toxin. Our results support the idea that development of the Bt potato may have been hampered in part by its positive effects on sucking insect pests, and underline the importance of conserving the natural enemies of secondary pests that are indirectly favoured.
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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 | 0.008 | 0.009 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.006 | 0.016 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".