Biometry of the branchial plume in the hydrothermal vent tubeworm<i>Riftia pachyptila</i>(Vestimentifera; Annelida)
Bibliographic record
Abstract
The branchial plume of the hydrothermal vent tubeworm Riftia pachyptila is the main organ by which this mouth- and gut-less tubeworm directly exchanges metabolites with its environment. We estimated the total branchial surface area per unit wet mass, termed the specific branchial surface area (SBSA), from planimetric measurements. Changes in the SBSA during the growth of the worm were inferred from 16 individuals ranging from 1 to 112 g wet mass. Riftia pachyptila has a mean SBSA of 22 cm 2 ·g 1 , the second highest among all aquatic animals, representing 9 times the surface area of the rest of the body. Three significantly different classes of SBSA could be distinguished, corresponding to small, medium-sized, and large individuals. The SBSA values for small and medium-sized R. pachyptila are twice that for large individuals. Negative growth allometry between the length of the branchial plume and that of the trunk may be correlated with this variation in SBSA, the plume growing faster than the trunk in the small and medium-sized groups. In large individuals the trunk length exceeds the plume length, inducing an increase in body mass that lowers the SBSA. However, a lower SBSA does not imply reduced metabolite diffusion through the plume of large tubeworms, since their longer free filaments bear more developed pinnules, which are probably the preferred pathway of metabolite diffusion, owing to a minimal transepithelial distance of 2 µm.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.012 | 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".