Temporal variation of periphyton communities: a 3-year study from northwest Lake Simcoe, Ontario, Canada
Bibliographic record
Abstract
Periphyton composition, density, and diversity (Shannon-Wiener index), as well as thickness of periphyton communities developed on glass coupons, were studied from nearshore areas of northwest Lake Simcoe, Canada, during 2009Canada, during , 2010Canada, during , and 2011.The objective of this study was to quantify the temporal (yearly) changes in periphyton occurring in the littoral zone of Lake Simcoe and identify water quality variables that may be driving periphyton community dynamics.Clean glass slides were suspended at 0.5 m below the surface waters and retrieved on multiple days after suspension.The retrieved glass slides were immediately analyzed under a microscope to observe periphyton genera composition, density, diversity, and biofilm thickness.While the number of genera, diversity, and biofilm thickness showed significant variation among years of observation, the density did not.In all 3 years, Bacillariophyta were the dominant group, while Chlorophyta, cyanobacteria, and Chrysophyta were routinely represented in the periphyton community.A periphyton community dominated by Navicula and Gomphonema in 2009 changed to Achnanthidium and Cocconeis in 2010, which subsequently changed to Achnanthidium and Navicula (all belonging to Bacillariophyta) in 2011.The density of periphyton was significantly related to biofilm thickness across all 3 years.Principal component analysis on periphyton genera composition and abundance showed variation among years.Regression analysis suggested the shift in the number of genera was related to the variation in total phosphorus and dissolved oxygen concentrations in the water.Long-term data on periphyton community dynamics will prove useful to devise a periphyton-based water quality index for northwest Lake Simcoe.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.006 | 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 teacher head, 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".