The role of vision in host-finding behaviour of the ectoparasite <i>Gnathia falcipenis</i> (Crustacea; Isopoda)
Bibliographic record
Abstract
Gnathiids are common isopod crustaceans that feed on blood and plasma from a wide range of reef fishes. Although parasitic gnathiid isopods are active during both day and night on the Great Barrier Reef, little is known about their behaviour and ecology due to difficulty with species identification. Information about nocturnal gnathiids is especially lacking because of logistical constraints. This study shows that a gnathiid species captured at night, Gnathia falcipenis, has a larger eye diameter than that of a taxonomically undescribed sympatric diurnal species, Gnathia sp. A. When tested in a phototaxis experiment with this diurnal species, G. falcipenis moved towards a light source at much lower levels of light intensity than the diurnal species. Their willingness to feed in lab tests with live host fish was also strongly linked to light conditions. This gnathiid appears to have visual adaptations that have evolved for foraging under very low light levels, and is probably completely nocturnal. These results are discussed with reference to the availability of different host fishes during the day and night, the risk of predation that gnathiids may encounter during these periods, and the possibility of an unappreciated diversity of gnathiid taxa that may have a range of foraging strategies.
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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) | 0.001 | 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".