Atlantic cod and snow crab predator–prey size relationship in the Gulf of St. Lawrence, Canada
Bibliographic record
Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 363:227-240 (2008) - DOI: https://doi.org/10.3354/meps07384 Atlantic cod and snow crab predator–prey size relationship in the Gulf of St. Lawrence, Canada Denis Chabot1,*, Bernard Sainte-Marie1, Karine Briand1,2,4, John Mark Hanson3 1Direction des sciences halieutiques et de l'aquaculture, Institut Maurice-Lamontagne, Pêches et Océans Canada, C.P. 1000, Mont-Joli, Quebec G5H 3Z4, Canada 2ISMER, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, Quebec G5L 3A1, Canada 3Gulf Fisheries Centre, Fisheries and Oceans Canada, P.O. Box 5030, Moncton, New Brunswick E1C 9B6, Canada 4Present address: SPC Headquarters, BP D5, 98848 Noumea Cedex, 95 Promenade Roger Laroque, Anse Vata, New Caledonia *Email: denis.chabot@dfo-mpo.gc.ca ABSTRACT: Atlantic cod Gadus morhua stomach contents (n = 30 973, including 28 377 non-empty stomachs) and morphometric measurements on live snow crab Chionoecetes opilio and cod were examined to assess the predator–prey relationship between these 2 species. The most common snow crab instars found in cod stomachs were III and V (~6 to 8 and ~12 to 16 mm carapace width [CW], respectively) in the northern Gulf of St. Lawrence (GSL) and VI and VII (~17 to 23 and ~23 to 31 mm CW, respectively) in the southern GSL. A significant positive relationship was found between cod length and the largest and smallest CW of snow crab ingested by cod. Positive relationships were also found between gape width and body length in cod and between 3 measures of size (maximum span, width at rest, length at rest) and CW in snow crab. Snow crab length at rest was closely related to cod gape width, suggesting that the largest snow crab ingested by cod must be attacked from the side. There appears to be a plateau at 65.1 mm in the relationship between maximum snow crab CW and cod length, caused by the absence of large (adolescent and adult) male snow crab in cod stomachs. Other studies have found recently moulted, soft-shell snow crabs in cod stomachs, but this appears to be rare. Thus, snow crabs are susceptible to predation by cod mostly for the first 4 yr of post-settlement in the GSL. Any effect of cod predation on the snowcrab fishery would be felt 6 to 11 yr later, given growth models established for the GSL. KEY WORDS: Chionoecetes opilio · Gadus morhua · Gape width · Prey selection Full text in pdf format Supplementary appendix PreviousNextCite this article as: Chabot D, Sainte-Marie B, Briand K, Hanson JM (2008) Atlantic cod and snow crab predator–prey size relationship in the Gulf of St. Lawrence, Canada. Mar Ecol Prog Ser 363:227-240. https://doi.org/10.3354/meps07384Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 363. Online publication date: July 15, 2008 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2008 Inter-Research.
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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 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".