Radiocarbon evidence for annual growth rings in the deep-sea octocoral Primnoa resedaeformis
Bibliographic record
Abstract
The deep-sea gorgonian octocoral Primnoa resedaeformis is distributed throughout the Atlantic and Pacific Oceans at depths of 65 to 3200 m.It has a 2-part skeleton of calcite and gorgonin.Towards the inside of the axial skeleton gorgonin and calcite are deposited in concentric growth rings, similar to tree rings.Colonies were collected from the NE Channel (NW Atlantic Ocean, southwest of Nova Scotia, Canada) from depths of 250 to 475 m.Radiocarbon was measured in individual rings isolated from sections of each colony, after dissolution of calcite.Each Δ 14 C measurement was paired with a ring age determined by 3 amateur ring counters.The precision of ring counts averaged better than ± 2 yr.Accurate reconstruction of 20th century bomb-radiocarbon showed that (1) the growth rings are formed annually, (2) the gorgonin is derived from surface particulate organic matter (POM) and (3) useful environmental data are recorded in the organic endoskeletons of deep-sea octocorals.These results support the use of P. resedaeformis as a long-term, high resolution monitor of ocean surface conditions, particularly in temperate and boreal environments where proxy data are lacking.
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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 | 0.001 |
| 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".