Temporal and spatial migration of Atlantic cod (<i>Gadus morhua</i>) inside and outside a marine protected area and evidence for the role of prior experience in homing
Bibliographic record
Abstract
Despite efforts to protect the resident Atlantic cod (Gadus morhua) population in Gilbert Bay, Labrador, its abundance has decreased since the area was designated a Marine Protected Area (MPA). As part of an effort to understand the reasons for the decline, tracking of cod tagged with surgically implanted ultrasonic transmitters was conducted to determine the migratory behavior of cod in relation to MPA boundaries. Acoustic tracking used a network of data-logging receivers deployed in Gilbert Bay and contiguous marine waters, permitting year-round monitoring of fish movements over several years. Acoustic tracking indicated that 93% of mature migratory cod >55 cm total length homed to the overwintering area where they were initially tagged. During summer months some individuals moved to the mouth of the bay and marine waters outside the MPA. Collectively, the home range of the Gilbert Bay cod encompassed an area within about 40 km of their overwintering and spawning site, but included a large area (∼270 km2) outside the MPA. Eleven percent of tagged cod released outside their home range returned to the capture site within 1 year after tagging. In contrast, fish transplanted 15 or 25 km from the capture site, but still within their home range, exhibited 100% success in homing, suggesting the importance of prior experience with the migration route for successful homing. This study documents the importance of knowledge concerning the migratory and homing behavior of resident fish populations for their conservation and management.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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".