Evidence of very low genetic diversity of cuban gar (Atractosteus tristoechus)/ Evidencia de pobre diversidad genética del manjuarí (Atractosteus tristoechus)
Bibliographic record
Abstract
The Cuban gar (Atractosteus tristoechus) is an endemic freshwater fish species of Cuba. Among the Lepisosteiformes, this species is one of the most threatened and has the lowest natural distribution range. It is restricted to the southwestern region of the Cuban archipelago. This research is focused on the genetic characterization of captive and wild populations of Zapata Swamp, using two mitochondrial sequences (one in the gene coding cytochrome c oxidase I and the other in the Control Region) and nine microsatellite loci. A total of 47 individuals were included in the study. Low genetic variability was detected: h = 0.202 ± 0.077 and π = 0.0002 ± 0.00008 for mitochondrial sequences; Ho = 0.016 and He=0.025 for microsatellites. Among lepisosteids studied so far, this species showed the lowest genetic diversity. The results suggest that A. tristoechus had a low effective population size over a long period of time and/or the population went through a recent bottleneck. Given the recent demographic trend of this species and the low genetic diversity revealed in the present study, special attention and conservation efforts are urgently needed. RESUMEN El manjuarí (Atractosteus tristoechus) es un pez de agua dulce endémico de Cuba. Entre los Lepisosteiformes, esta especie es una de las más amenazadas y ocupa la menor área de distribución natural. Está restringida al área suroeste del archipiélago cubano. Esta investigación se enfoca en la caracterización genética de las poblaciones cautivas y naturales de la Ciénaga de Zapata, mediante dos secuencias mitocondriales (gen que codifica citocromo c oxidasa I y la Región de Control) y nueve loci microsatélite. Un total de 47 individuos fueron incluidos en la investigación. Se detectó baja variabilidad genética: h = 0.202 ± 0.077 y π = 0.00021 ± 0.00008 para las secuencias mitocondriales; Ho=0.016 y He=0.025 para los microsatélites. Entre los lepisosteidos estudiados hasta el momento, esta especie muestra la menor variabilidad genética. Estos resultados sugieren que A. tristoechus ha mantenido un pequeño tamaño efectivo poblacional durante largo tiempo y/o la población ha experimentado un cuello de botella reciente. Dada la reciente tendencia demográfica de la especie, y la baja diversidad genética mostrada en este estudio, se hace necesaria con urgencia una atención especial, así como esfuerzos para su conservación.
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 | 0.000 |
| 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".