A bridge too far: dispersal barriers and cryptic speciation in an Arabian Peninsula grouper (<i>Cephalopholis hemistiktos</i>)
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Aim We use genetic and age‐based analyses to assess the evidence for a biogeographical barrier to larval dispersal in the yellowfin hind, Cephalopholis hemistiktos, a commercially important species found across the Arabian Peninsula. Location Red Sea, Gulf of Aden, Gulf of Oman and Arabian Gulf. Methods Mitochondrial DNA cytochrome‐ c oxidase subunit‐I and nuclear DNA ( S7 ) sequences were obtained for C. hemistiktos sampled throughout its distributional range. Phylogeographical and population‐level analyses were used to assess patterns of genetic structure and to identify barriers to dispersal. Concurrently, age‐based demographic analyses using otoliths determined differences in growth and longevity between regions. Results Our analyses revealed significant genetic structure congruent with growth parameter differences observed across sampling sites, suggesting cryptic speciation between populations in the Red Sea and Gulf of Aden versus the Gulf of Oman and Arabian Gulf. Coalescence analyses indicated these two regions have been isolated for > 800,000 years. Main conclusions Our results indicate historical disruption to gene flow and a contemporary dispersal barrier in the Arabian Sea, which C. hemistiktos larvae are unable to effectively traverse. This provides yet another example of a (cryptic) species with high dispersive potential whose range is delimited by a lack of suitable habitat between locations or an inability to successfully recruit at the range edge.
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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 | 0.000 | 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 it