COMPOSITIONAL FIDELITY OF DEATH ASSEMBLAGES FROM A CORAL REEF-ASSOCIATED TIDAL-FLAT AND SHALLOW SUBTIDAL LAGOON IN THE NORTHERN RED SEA
Bibliographic record
Abstract
Abstract This study focuses on quantitative analysis of the species composition and distribution of living and dead mollusks to assess fidelity of death assemblages in a protected tidal flat and a shallow subtidal lagoon behind a fringing reef from the Indo-Pacific province. We evaluate how well the death assemblage (DA) reflects the original living community and whether there was a recent ecological shift in species composition. Quantitative analysis of 18 samples from unvegetated sandy substrata shows that dead individuals dominate in the shallow subtidal lagoon, but living and dead individuals were roughly equally abundant on the tidal flat. This difference points to rapid degradation or export of dead shells from tidal flats, leading to smaller potential for time averaging. Rarefied species richness and diversity of DAs is higher than that of the living assemblages (LAs) at the scale of habitats and at the scale of the study area, and this difference in richness is stronger and live-dead (LD) agreement in composition is smaller in the subtidal than in the intertidal habitats. Distinct assemblages characterized intertidal and subtidal habitats both in LAs and DAs, and the rank-abundance distributions of DAs generally corresponded to that of LAs. We suggest that anthropogenic impact in the area did not result in a major environmental change in the subtidal environment during the past few decades because existing small differences between LAs and DAs can be explained by some degree of time averaging and small-scale redistribution of shells. On the tidal flat, however, the lower time-averaging of the DA and the generalistic life habits of prominent members in the LA do not exclude a major shift.
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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 | 0.001 | 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 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".