Age, length and reproductive parameters of harbour porpoises Phocoena phocoena (L.) from West Greenland
Bibliographic record
Abstract
During 1988, 1989 and 1995, 187 harbour porpoises ( Phocoena phocoena ) were sampled from the catches off West Greenland during the months of July, August and September. The samples were taken between 62°N and 69°30′N in Maniitsoq and three more northerly locations (134), Paamiut (23), and Nuuk (30). Comparison of age and length distributions between years and areas, indicated that there were no significant differences between years. However, the Maniitsoq and northerly samples had a modal age in both sexes of about 2 yr and a maximum age of 17 yr, while the more southerly Nuuk and Paamiut samples were biased to younger age classes, with the modal age in both sexes being the first year of life (age class 0 yr) and a maximum age of 12 yr. Females ovulated from age 3.6 yr at a length of about 142 cm; combined testes weights > 200 g indicated maturation in males from age 2.5 yr upwards at a length > 125 cm. Several small embryos were found, consistent with a mating season in late summer. Testis hypertrophy in August was also consistent with a late summer breeding. Application of growth models indicated an average asymptotic length of 154 cm in females and 143 cm in males. Comparisons of the West Greenland data with similar data for porpoises from the Canadian Atlantic, eastern North Atlantic and the North Sea, where genetic studies have shown population differences, indicated differences in biological parameters.
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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 | 0.001 | 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".