Mechanism for maintaining oxygen consumption under varying oxygenation levels in the freshwater clam<i>Corbicula fluminea</i>
Bibliographic record
Abstract
The basic adaptation mechanisms that allow the Asian freshwater clam Corbicula fluminea to maintain its oxygen (O2) consumption constant under resting conditions when the partial pressure of O2([Formula: see text]) in the water varies from 4 to 40 kPa were studied at plankton concentrations which were high enough that ventilation was not affected. Steady-state values for O2consumption, [Formula: see text], and O2concentration in the arterial and venous blood, [Formula: see text] in the expired water, and ventilatory and circulatory blood flow were determined after 24-h periods of exposure to selected water [Formula: see text] values. The key adaptation after 1 day of acclimation was the maintenance of O2consumption, which was achieved exclusively by ventilatory adjustment, with no change in the oxygenation status of the internal milieu. Specifically, arterial [Formula: see text] remained constant at 3 kPa and venous [Formula: see text] at 2 kPa. Arterial and venous blood O2concentrations and blood-flow rate also remained constant. The data are discussed in terms of feeding versus respiratory control of ventilation in filter-feeders in an environmental context. The agreement between the homeostasis strategy described here and previous results reported for the freshwater mussel Anodonta cygnea, crustaceans, and teleosts is emphasised.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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".