Age and body size in four introduced populations of the American bullfrog, <i>Lithobates catesbeianus</i> (Ranidae)
Bibliographic record
Abstract
The American bullfrog, native to the eastern half of North America including southern Quebec, is considered one of the most invasive species in the world. It has been introduced in America, Asia and Europe, mainly for food purposes. A study on the age and body size of this species was carried out on individuals obtained from four introduced populations (one from Western Canada and three from France), using the skeletochronological method. Adults did not differ between sexes in mean body size or mean age, with the exception of one population in France where males were younger than females. Several differences in the mean age and body size were observed, with the individuals from the population in Canada exhibiting the highest values for both sexes. The scarcity of studies in the native range prevents the comparison of introduced versus native populations, and we focus on comparisons between introduced populations.
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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 | 0.001 |
| 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 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".