A First Report of Shell Disease Impacting Cancer borealis (Jonah Crab) in the Bay of Fundy
Bibliographic record
Abstract
Several shell diseases are impacting a variety of decapod crustaceans in southern New England, but have rarely been reported in the colder waters of the eastern Gulf of Maine. Here we document a possible outbreak of shell disease impacting Cancer borealis (Jonah Crab) on Kent Island, NB, Canada. On low tides of 31 August 31–3 September 2017 we found hundreds of Jonah Crabs stranded above the tide line and resting on top of the dense canopies of fucoid algae. Closer inspection of exoskeletons revealed the clinical signs of classical shell disease: dark circular patches and lesions that penetrated the cuticle. A sample of 30 stranded Jonah Crabs revealed that 28 (93%) were adult females. On the next low tide, we found the same pattern of exposed Jonah Crabs and observed numerous instances of Larus smithsonianus (Herring Gull) predation. Continuous monitoring of shallow-water temperatures over the last 3 years revealed that average daily summer temperatures have been regularly exceeding a shell-disease threshold of 12 °C on Kent Island. Between 13 September and 31 October 2015 there were 19 days with an average water temperature above 12 °C and 43 days during the same interval in 2016.
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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 | 0.000 | 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".