Effect of body size on response to emersion and molt increment of post-ovigerous female American lobsters Homarus americanus (H. Milne Edwards, 1837) (Decapoda: Nephropidae) from southern and northern Gulf of St. Lawrence, Canada
Bibliographic record
Abstract
Stocks of the American lobster Homarus americanus (H. Milne Edwards, 1837) are facing major environmental changes, and reproductively active females are a vulnerable and key component of these stocks. This study compares the capacity of mature females from the southern and the northern Gulf of St. Lawrence, Canada to withstand environmental stress. Molt increments and responses to a short-term emersion challenge (90 min) were compared among post-ovigerous females from two southern (Caraquet and Toney River) and two northern (Anticosti and Gaspé) sites in controlled laboratory conditions. The females from Caraquet had the smallest carapace length (CL) followed by those from Toney River and those from northern sites. Over a size range of 74–127 mm CL, molt increments were similar among sites (median (Q1–Q3), 7.3 mm (5.7–8.2) and unrelated to body size. Relative molt increments (% CL) were greater in smaller females, suggesting greater allocation of energy for growth. Emersion induced accumulation of haemolymph lactate, indicative of metabolic acidosis. Lactate increased with decreasing body size and with increasing haemolymph proteins, and thus, was higher in small-size, non-molted lobsters. The study shows that body size is an important driver for both growth investment and sensitivity to emersion in southern and northern females. Small-size ovigerous females are particularly sensitive to emersion and likely to other environmental stressors, and consequently. southern Gulf stocks with higher proportions of smaller females, are more vulnerable. This study provides novel information on molt increments variation in mature females useful for the refinement of Gulf of St. Lawrence lobster demographic models.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| 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 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".