Chlorophyll Fluorescence as a Bioindicator of Photosynthesis Inhibition from Solar Ultraviolet Radiation in Plants and Algae
Bibliographic record
Abstract
Chlorophyll fluorescence is a simple, rapid technique for measuring photosynthetic efficiency in plants and algae. Pulse-amplitude modulated chlorophyll fluorescence was examined in aquatic plants and natural assemblages of Lake Erie phytoplankton exposed to solar ultraviolet (UV) radiation. UV-exclusion studies were performed in which plastic films were used to screen sunlight to remove ultraviolet-B radiation (295–320 ran), or UVB plus ultraviolet-A radiation (320–400 nm) in outdoor aquatic microcosms and ship exposure chambers. UV had negligible impacts on photosynthesis and growth in the aquatic macrophyte Myriophyllum spicatum in microcosms. However, photosynthetic electron transport in natural assemblages of Lake Erie phytoplankton was substantially diminished by short exposures to full sunlight. Phytoplankton exposed to full sunlight for 30 min lost 90 % of maximum photosystem II efficiency (Fv/Fm) and 75 % of the effective yield of photosystem II photochemistry (ΔF/Fm). Diminished photosynthetic electron transport was primarily due to UVB wavelengths in sunlight. UVA and visible wavelengths also diminished photosynthetic electron transport to a lesser extent. Thus, this assay represents a general bioindicator of effects from environmental stress in freshwater plants and algae that is able to detect impacts due to current and increasing levels of UVB.
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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) | 0.003 | 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 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".