The evolutionary response to hunting-induced selection on horn characteristics in Yukon thinhorn sheep (Ovis dalli)
Why this work is in the frame
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Bibliographic record
Abstract
When harvest criteria are based on phenotype, trophy hunting may select against the size of secondary sexual characteristics, including horns. Here I investigated the effects of trophy hunting on horn growth and morphology in thinhorn sheep (Ovis dalli). Trophy rams, harvested between 1996-2021 in the Yukon (n = 247), were genotyped from dried flesh or horn core specimens using a custom-designed 6050 SNP genotype-by-sequencing panel. With this panel, I calculated a genomic relationship matrix to estimate trait heritability, temporal changes in breeding values and the predicted response to selection based on age at harvest. Among measured horn characteristics, only growth was under negative directional selection because of harvesting; however, observed trends did not vary over this period, due to changes in the environment or bias in the sampling design. My study illustrates the potential and challenges of genotyping historical specimens to reveal the impacts of harvesting selection on trait variation.
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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 | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.001 |
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