Impending extirpation of an isolated Nassau grouper (Epinephelus striatus) population at Glover’s Atoll, Belize, based on two decades of monitoring
Bibliographic record
Abstract
Abstract Nassau grouper (Epinephelus striatus) was once among the most abundant and commercially important reef fish species in the Caribbean region. Overextraction at their fish spawning aggregations (FSAs) has contributed significantly to dramatic regionwide declines in their populations, resulting in widespread local extirpations, nominal presence in catch composition and categorization as an IUCN critically endangered species. This study reviews over 20 years of fishery-dependent and fishery-independent observations to examine the status of a spatially isolated population of Nassau Grouper inhabiting Glover’s Atoll, Belize (which is wholly encompassed by Glover’s Reef Marine Reserve) and utilizing a single well-documented reproductive site. Nassau grouper at Glover’s Reef Marine Reserve has decreased in abundance by 85% at the spawning site and decreased in density to virtually undetectable levels across all habitats and management zones despite seasonal and spatial closures, upper and lower size limits and collaborative monitoring and enforcement since 2003. Nassau grouper is also extremely rare in fisher catches both at Glover’s Reef Marine Reserve (n = 118 over 20 years) and nationally (18 of 18,383 fish observed at landing sites between 2017 and 2020), with juvenile fish comprising over 75% of the sampled individuals. The population at Glover’s Reef Marine Reserve continues to decline on a trajectory towards local extirpation. Closure of management gaps, including chronic enforcement resource deficits, may not guarantee recovery but has been a necessary precursor to recovery of other FSAs in the Caribbean.
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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 | 0.001 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".