Molecular Phylogenetics of the Eastern and Western Blacknose Dace,<i>Rhinichthys atratulus</i>and<i>R. obtusus</i>(Teleostei: Cyprinidae)
Bibliographic record
Abstract
The debate over the species status and geographic distribution of Rhinichthys atratulus and R. obtusus has persisted for decades. Morphological analyses have led to ambiguous results making field identifications possible in only some areas, further complicating the unclear and conflicting taxonomic histories of these species. In this study, we clear up some of these identification issues by analyzing two mitochondrial genes and nine microsatellite loci amplified from Blacknose Dace across the eastern half of North America. Our results show large genetic differences between R. atratulus and R. obtusus for both mitochondrial genes and microsatellites. We determine that R. atratulus inhabits streams east of the Appalachians from Nova Scotia to Virginia and the southern part of the eastern Great Lakes; R. obtusus inhabits the remaining regions west of the Appalachians to approximately Minnesota, eastern Nebraska, north into the Manitoba province and Mobile Bay drainage.
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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 | 0.000 | 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 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".