Examination of nuclear loci across a zone of mitochondrial introgression between Tamias ruficaudus and T. amoenus
Bibliographic record
Abstract
The importance of hybridization in animal evolution has become controversial. Gene flow between divergent taxa can strongly influence processes of great interest to evolutionary biologists, such as speciation and adaptation. Mitochondrial DNA (mtDNA) introgression is a commonly observed, yet particularly poorly understood consequence of hybridization between divergent taxa. Several known cases of mtDNA introgression exist that are heterogeneous in time and space, and it is unknown whether this represents the influence of extrinsic factors, such as selection and demographic fluctuation, or more intrinsic ones, such as cytonuclear interactions or the mosaic evolution of reproductive isolation. It is usually assumed, on the basis of the apparent lack of hybrids at zones of contact, that this phenomenon is unaccompanied by further admixture at nuclear loci, although this assumption rarely is tested. We present an analysis of population structure and gene flow across a zone of mitochondrial introgression between 2 nonsister species of chipmunk (Sciuridae: Tamias). We examined patterns of variation in 11 nuclear markers (10 microsatellites and 1 sequence-based marker) and compared them with previously identified patterns of mtDNA variation. We found little evidence of nuclear gene flow but some correspondence of introgression with microsatellite population structure. This work suggests that a complex interaction of ecological and genetic factors could have structured introgression of mtDNA in this system.
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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 | 0.000 |
| 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 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".