Mutualistic relationship between the amphipod Stenula normanni (Stephensen, 1931) and the nephtheid coral Gersemia rubiformis (Ehrenberg, 1834)
Bibliographic record
Abstract
Gersemia rubiformis is a soft coral belonging to the family Nephtheidae, known to provide habitat for many organisms and to play an essential role in benthic ecosystems. The present study examined the relationship between G. rubiformis and the epibiotic amphipod Stenula nordmanni in the coastal waters of eastern Canada. The prevalence of the association was 100% with an average burden of 35 amphipods (mostly juveniles) per coral host. The sex ratio in the amphipods was female-biased and there was a distinct sexual dimorphism, males being significantly larger than females. In a single coral colony, about 38% of female amphipods were found to brood propagules at various stages of development up to juveniles. Upon release, juvenile amphipods were transparent and acquired the pink color characteristic of the adult by feeding on the coral tissues, thereby mimicking the coloration of the host. Ingestion of coral tissues was confirmed by the presence of host sclerites in the digestive tract of amphipods. In turn, amphipods were seen to protect their host by repulsing predatory nudibranchs approaching the coral colony. Together, findings suggest that the amphipods display a specific and obligate mutualistic association with their coral host, considering that they benefit from shelter and food, and the host benefits from active protection against potential predators. The apparent trophic relationship does not appear to generate any detriment to the host. In addition, some of the symbiotic amphipods examined were found to be hosts themselves, to chytrid fungi attached to their exoskeleton.
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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 | 0.000 | 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 | 0.001 | 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".