Seasonal changes in composition of the cyanobacterial community and the occurrence of hepatotoxic blooms in the eastern townships, Québec, Canada
Bibliographic record
Abstract
Four eutrophic lakes in the eastern townships (Québec, Canada) were sampled on a biweekly basis between May and October 2001 to examine seasonal changes, and to study the role of taxonomic and environmental factors in cyanobacterial toxin production. Microcystin-LR (MC-LR) equivalent content was determined using a protein phosphatase inhibition assay on extracts of lyophilized plankton. Three of the lakes showed a similar pattern of maximum water column toxicity in late summer, while in the fourth, toxicity was highest in spring and then declined over the year. Variations in water toxicity level could be attributed to the abundance of two potentially toxigenic genera, Microcystis and Anabaena. A multiple regression model explained 75% of the variation in microcystin (MC) concentration, based on water column total nitrogen concentration (TN) and the biomass of these two genera. Microcystis and Anabaena genera appeared to be similarly toxic in all lakes. Increased water column stability, higher light extinction coefficient and a lack of dissolved nutrients were all associated with increased total biomass of toxigenic cyanobacterial genera.
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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 | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 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".