Living on the edge: population parameters of the wedge clam <i>Donax hanleyanus</i> in the southernmost limit of its distribution range, southwestern Atlantic, Argentina
Bibliographic record
Abstract
The wedge clam Donax hanleyanus Philippi, 1845 is a conspicuous member of the sandy beach macrofauna along hundreds of kilometres in the northern coasts of Argentina. Age, growth, mortality, and productivity of this species were assessed in the southernmost limit of its distribution range (Mar del Plata, Buenos Aires province, Argentina). The parameters of the von Bertalanffy growth function were SL∞ = 23.23 mm, K = 1.62 year−1, and t0 = 0.08 years. The maximum individual production was 7.9 × 10−7 g shell-free wet mass (SFWM)·year−1 at a shell length of 14–16 mm. Individuals between 10 and 12 mm contributed the most to the secondary production (P) of 0.01 g SFWM·m−2·year−1. The mean annual biomass (B) was 0.002 g SFWM·m−2·year−1. Annual P/B ratio and mortality coefficient (Z) were 4.48 year−1 and 4.78 year−1, respectively. Low production and high mortality could be caused by a sharp decrease in habitat quality, given the suboptimal temperatures at the southernmost edge of the species distribution. These results strongly limit its potential for future commercial exploitation.
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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 | 0.000 | 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".