Assesing Marine Phytoplankton Composition and Early Land Plant Impacts on the Evolving Paleozoic Marine Biosphere
Bibliographic record
Abstract
Summary The role of an expanding Paleozoic terrestrial biosphere, fueled by the radiation of early land plants, may have significantly influenced ocean chemistry and biology by altering the global biogeochemical cycling of redox-sensitive elements and essential nutrients. Our detailed lipid biomarker records, used in conjunction with inorganic redox proxies and biostratigraphy, are helping to constrain how the composition of paleotropical marine communities evolved through the Ordovician-Silurian-Devonian transition. Sterane records strongly suggest that 24-n-propylcholestane (24-npc), sourced from marine pelagophytes and their algal ancestors, first appeared as a common ancient marine algal signal during the Silurian Period. Our study helps to untangle the cryptic influence of progressive continental greening on perturbing the Paleozoic marine biosphere and driving increasing oxygenation over protracted timescales.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".