Physiological ecology of photosynthesis in <i><scp>P</scp>rasiola stipitata</i> (<scp>T</scp>rebouxiophyceae) from the <scp>B</scp>ay of <scp>F</scp>undy, <scp>C</scp>anada
Bibliographic record
Abstract
Summary The physiological ecology of P rasiola stipitata was examined in situ from two supralittoral sites in the B ay of F undy ( N ova S cotian, C anada) during N ovember 2011, when the population was undergoing major expansion. Photosynthetic parameters (effective quantum yield, Φ PSII , maximum quantum yield, F v / F m , and relative electron transport rate, rETR ) were evaluated using chlorophyll fluorescence of PSII . A largely shaded and continuously moist population showed no change in Φ PSII from one hour after sunrise to sunset in which natural irradiance varied between 3 and 300 μmol photons m −2 s −1 . High irradiance (up to 1800 μmol photons m −2 s −1 ) had no apparent negative impacts on either quantum yield or rETR , but high desiccation in the field reduced quantum yield to almost zero. When thalli were brought into the laboratory, no change in F v / F m was observed up to 60% dehydration; however, there was a steep decline in F v / F m between 60% and 85% dehydration. Thalli showed complete recovery of F v / F m within one hour of reimmersion in seawater after 2 days of desiccation. After 15 days of desiccation full recovery required 24 h and after 30 days of desiccation thalli showed only partial recovery. These observations confirm the adaptation to photosynthesis in high irradiances and the rapid recovery following extreme desiccation observed in other P rasiola species.
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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 | 0.005 | 0.062 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.003 |
| Science and technology studies | 0.001 | 0.003 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.005 | 0.002 |
| Research integrity | 0.002 | 0.004 |
| Insufficient payload (model declined to judge) | 0.002 | 0.002 |
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; both teacher heads agree on what is shown here.
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".