PHOTOSYNTHETIC ABILITIES OF FUCOID ALGAE DURING LOW TIDE: DIFFERING RESPONSES OF ADULTS AND YOUNG STAGES
Bibliographic record
Abstract
Lamote, M.1 , Johnson, L. E.1 & Lemoine, Y.2 1G.I.R.O.Q., Université Laval, Québec, G1K 7P4, Canada; 2Laboratoire de cytophysiologie végétale et Phycologie, Université de Lille I, 59575 Villeneuve d'Ascq, France On the intertidal rocky shores of the Gaspé Peninsula (Québec), three species of fucoid algae (Ascophyllum nodosum, Fucus vesiculosus, Fucus distichus) form distinct zones. One possible underlying cause of this pattern is that the upper limit of each species determined by physiological stresses, especially that experienced by younger stages which are likely to be more susceptible. To assess this possibility, we investigated the photosynthesis activity of these macroalgae using chlorophyll a fluorescence as measured by pulse‐amplitude modulated fluorometry (PAM). Measurements of the responses of both adult and early stages (3‐wk old) were made in the field during low tide under different meteorological regimes, including sunny and windy conditions. In general, algae became more photoinhibited (i.e., reduced photosynthetic efficiency, Fv/Fm) with increasing levels of insolation and desiccation, and early stages showed a more dramatic response than did the adults. Recovery was rapid, especially for the embryos. During sunny, calm conditions adults of the species found lowest on the shore (F. distichus) became photoinhibited more rapidly than those at higher levels. In contrast, the embryos of the highest species (A. nodosum) were the most susceptible to stresses experienced during emersion, especially high levels of insolation. Thus, whereas the physiological characteristics of the adults were consistent with their patterns of vertical distribution, those of the early post‐settlement stage were not, suggesting possible ontogenetic shifts in their capacities to response to environmental conditions.
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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 | 0.000 |
| 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) | 0.001 | 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".