DNA barcodes provide new evidence of a recent radiation in the genus<i>Sporophila</i>(Aves: Passeriformes)
Bibliographic record
Abstract
The capuchinos are a group of birds in the genus Sporophila that has apparently radiated recently, as evidenced by their lack of mitochondrial genetic diversity. We obtained cytochrome c oxidase I (COI) sequences (or DNA barcodes) for the 11 species of the group and various outgroups. We compared the patterns of COI variability of the capuchinos with those of the largest barcode data set from neotropical birds currently available (500 species representing 51% of avian richness in Argentina), and subjected COI sequences to neighbour-joining, maximum parsimony and Bayesian phylogenetic analyses as well as statistical parsimony network analysis. A clade within the capuchinos, the southern capuchinos, showed higher intraspecific and lower interspecific divergence than the remaining Argentine species. As most of the southern capuchinos shared COI haplotypes and pairwise distances within species were in many cases higher than distances between them, the phylogenetic affinities within the group remained unresolved. The observed genetic pattern is consistent with both incomplete lineage sorting and gene flow between species. The southern capuchinos constitute the only large group of species among the neotropical birds barcoded so far that are inseparable when using DNA barcodes, and one of few multispecies avian groups known to lack reciprocal monophyly. Extending the analysis to rapidly evolving nuclear and mitochondrial markers will be crucial to understanding this radiation. Apart from giving insights into the evolution of the capuchinos, this study shows how DNA barcoding can rapidly flag species or groups of species worthy of deeper study.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".