Ten-year record of Thalassiosira nordenskioeldii population dynamics: comparison of aquaculture and non-aquaculture sites in the Quoddy Region
Bibliographic record
Abstract
A long-term plankton monitoring programme resulted in a ten-year record (1988–1997) for bloom timing and magnitude at four sites in the Quoddy Region. Two sites are located in areas removed from salmonid aquaculture operations, whereas two sites were located close to an aquaculture site. However, at one of these, cages were removed in 1994. Thalassiosira nordenskioeldii was detected each spring during the months of April through June. Highest concentrations were observed during 1991 or 1992, with cell concentrations at all four stations two to three times greater than during most other years. This diatom was more variable in its relative contribution to the phytoplankton community at the non-aquaculture locations and rarely exceeded 60% at any of the stations. Trend analysis of relative abundance data revealed significant positive trends only for the two aquaculture sites (Spearman/Lettenmaier test, slopes 1.40% and slope 0.79% yr −1 ). Concurrently, the aquaculture site located in a sheltered bay also showed a significant negative trend in salinity. The analysis suggests that T. nordenskioeldii has increased its contribution to the phytoplankton community at the sites located near aquaculture activity, one of which also became less saline. These changes may be related to aquaculture activities, although the causative factor(s) is yet unidentified. The trends suggest that this diatom is sensitive to changes in the local environment.
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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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".