Dynamic elastocapillary coalescence of fish gill lamellae
Why this work is in the frame
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Bibliographic record
Abstract
Aquatic animals like fishes and larval amphibians have flexible gills with a large surface area for gas exchange. When exposed to air, gills typically collapse and coalesce due to the elastocapillary effect, reducing gas exchange and potentially causing death. To resist these effects, some amphibians are hypothesized to have evolved stiffened gills, but these elastocapillarity effects have not been investigated empirically or theoretically. Here, we examine the deformations of artificial elastomeric gill lamellae under quasi-static and dynamic liquid crossing scenarios, inspired by conditions faced by amphibious animals when leaving water. First, we discovered multiple equilibrium states when the liquid interface is pinned to the lamellae tips, where lamellae either coalesce or remain separated depending on the liquid volume constraints. Moreover, we observe a unidirectional collapse pattern, termed the 'dominos pattern', under spatially variant drainage rate. A reduced-order dynamic model provides quantitative insights into these equilibria based on the lamellae properties, liquid volumes and drainage conditions leading to dominos patterns. These results inspire novel hypotheses about how elastocapillary may influence the evolution of gill structure in amphibious species, and also provide bioinspiration for engineering applications such as polymorphic display devices using flexible lamellae.
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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 | 0.000 | 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 | 0.000 |
| 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 it