Biogeochemical and geomorphological controls on mercury dynamics in a macrotidal salt marsh, Bay of Fundy, Canada
Bibliographic record
Abstract
Salt marsh biogeochemistry is generally dominated by sulfur transformations, and sulfate-reducing bacteria have been implicated as primary methylators of mercury (Hg). Some salt marshes have been shown to support high methylmercury (MeHg) production rates that may have adverse effects on biota, however little is known about the Hg dynamics of macrotidal salt marshes that dominate the important Bay of Fundy ecoregion in Canada. This study's aim is to provide a preliminary assessment of the distribution of, and controls on, sediment and pore water MeHg concentrations in a salt marsh heavily influenced by macrotidal activity in New Brunswick, Canada. Concentrations of bulk and dissolved total mercury (THg), MeHg, sulfate, sulfide, iron and chloride were determined along a geomorphic gradient and along the estuarine salinity gradient. THg and MeHg concentrations were frequently less than those found in the adjacent estuary, except in localized areas, suggesting a potentially important role for salt marshes.
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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 | 0.001 |
| Science and technology studies | 0.001 | 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) | 0.001 | 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".