Comparative branchial plume biometry between two extreme ecotypes of the hydrothermal vent tubeworm Ridgeia piscesae
Bibliographic record
Abstract
The vestimentiferan tubeworm Ridgeia piscesae Jones, 1985 from the Juan de Fuca Ridge is a morphologically plastic species with two contrasted ecotypes. The “chimney-dwelling” ecotype lives along the sides of active hydrothermal chimneys, where temperature and sulfide concentrations are high, but oxygen concentrations are low. Its morphology corresponds to the “short-fat” morphotype. The “basalt-dwelling” ecotype lives on rock outcrops in surrounding basaltic fields, where temperature and sulfide concentrations are low, but oxygen is readily available. Its morphology corresponds to the “long-skinny” morphotype. We compared the ultrastructure and biometry of their branchial plumes, the essential organ for respiration and nutrition in this symbiotic tubeworm. The branchial epidermis of both ecotypes contains electron-dense organelles, which may be related to the presence of sulfides in their environment. The diffusion distance across the gill epidermis is about 20% shorter in the short-fat R. piscesae. For tubeworms of the same mass, specific branchial surface areas (SBSA) are similar in both ecotypes (mean 24 cm2/g for worms of 1–2 g body mass), which is comparable with the SBSA in the vestimentiferan vent tubeworm Riftia pachyptila Jones, 1981 . The SBSA of R. piscesae follows a power curve that is negatively correlated with total body mass. The implications for gas uptake efficiency between these two ecotypes are discussed.
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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 | 0.000 | 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".