Circatidal rhythm of free-roaming sub-tidal green crabs, Carcinus maenas, revealed by radio-acoustic positional telemetry
Bibliographic record
Abstract
Activity patterns of sub-tidal free-roaming green crabs, Carcinus maenas (L., 1758), were monitored in real time using radio-acoustic positional telemetry in New Harbour, Nova Scotia, Canada. Activity patterns were monitored relative to time of day and tidal height. Periodogram analysis showed activity was circatidally rhythmic, as activity increased with rising tides and decreased with falling tides. Potential proximate and ultimate causes of observed circatidal rhythmicity in C. maenas are discussed. In contrast to other studies, no circadian rhythm was observed in crab activity. This is likely because other studies have been conducted in the intertidal zone, where desiccation and predation stress favour reduced activity during daylight hours. This study provides the first demonstration of circatidal rhythmicity in sub-tidal free-roaming C. maenas . Les modeles d'activite des crabes verts subtidaux errants, Carcinus maenas (L., 1758), ont ete determines en temps reel, en utilisant la telemetrie radio-acoustique positionnelle a New Harbour, Nouvelle-Ecosse, Canada. Les modeles d'activite etaient suivis par rapport au moment de la journee et a la hauteur de la maree. L'analyse du periodogramme a montre que l'activite etait calquee sur le rythme des marees, car l'activite augmentait avec les marees montantes et diminuait avec les marees descendantes. Les causes potentielles directes et indirectes de cette rythmicite circatidale observee chez C. maenas sont discutees. Contrairement a d'autres etudes, aucun rythme circadien n'a ete observe dans l'activite du crabe. Ceci s'explique probablement parce que les autres etudes ont ete menees dans la zone intertidale, ou le stress du a la dessiccation et a la predation favorise une activite reduite pendant la journee. Cette etude fournit la premiere demonstration de la rythmicite circatidale chez les C. maenas subtidaux errants.
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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 | 0.000 |
| 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 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".