The life history consequences of admixture between intentionally and unintentionally introduced populations of Trissolcus japonicus in Europe
Bibliographic record
Abstract
Introducing classical biological control agents from laboratory-reared populations into regions where adventive populations already exist could alter life history traits of the resulting admixed populations, having positive or negative consequences for pest control. In laboratory studies, we examined the life history consequences of admixture between one intentionally introduced laboratory-reared line (from China) and one pre-existing adventive line (from Switzerland) of Trissolcus japonicus (Hymenoptera: Scelionidae), an egg parasitoid of Halyomorpha halys (Hemiptera: Pentatomidae), in Europe. We tested reproductive compatibility and compared life history traits (fecundity, sex ratio, longevity, and development time) in reciprocal crosses between parental and hybrid lines of the two lines over multiple generations. The intentionally introduced and adventive lines were reproductively compatible, with no evidence of outbreeding depression or hybrid breakdown in either the first or third generations after crossing. Hybrid offspring exhibited life history traits that were either intermediate or similar to those of either parental line. Notably, hybrid lines showed higher fecundity and a more female-biased sex ratio than the adventive parental line. These findings suggest that admixture has some potential to introduce trait values thought to be positively associated with fitness and biological control efficacy. However, future studies are still needed to assess whether admixture between released laboratory-reared lines and adventive populations is actually occurring in the field, and whether it is having consequences for the efficacy of biological control by T. japonicus .
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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 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".