Habitat connectivity, gene flow, and population genetic structure in a Neotropical understory insectivore, the Rufous-and-white Wren
Bibliographic record
Abstract
Abstract Among tropical organisms, heightened habitat specialization, limited natal dispersal, and strong philopatry suggest that many species may experience reduced rates of gene flow. Diverse forms of barriers, including geographic, ecological, and behavioral barriers, further promote genetic divergence among tropical bird populations. Here, we extend our comprehension of gene flow in tropical birds by examining population genetic structure in a widespread insectivorous songbird of the Neotropics, the Rufous-and-white Wren (Thryophilus rufalbus). We explore the effects of geographic distance and habitat connectivity on genetic structure using 10 microsatellite loci, and nuclear and mitochondrial sequence data. We report high levels of genetic divergence and population structure with reduced contemporary gene flow between populations over a 500-km transect in Nicaragua and Costa Rica. Mitochondrial DNA and nuclear sequence data indicate that 2 distinct mtDNA genetic groups came into contact in northwestern Costa Rica; molecular dating suggests that the genetic patterns arose as a result of Pleistocene glaciations. Geographic distance and habitat connectivity predicted genetic structure but explained a relatively low proportion of the observed contemporary genetic variation. Patterns were similar for both males and females. Our research demonstrates the deep genetic divergence in tropical birds, and that genetic differentiation can occur over a relatively short distance. For tropical birds, strong limits to gene flow likely arise as a result of limited dispersal from natal 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 | 0.000 |
| 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".