31 Effects of light and ammonium on growth, ammonium uptake and pigmentation of four <i>porphyra</i> (bangiales, rhodophyta) species native to the northwestern atlantic
Bibliographic record
Abstract
The marketability and physiological characteristics of Porphyra (nori) make it a good candidate for integrated aquaculture. Four species were grown in separate three‐week greenhouse trials via tumble culture in small tanks (38L). Porphyra umbilicalis, P. linearis, P. leucosticta and P. amplissima were grown at 15, 8, 15 and 12 C, respectively. Plant growth, ammonium uptake, and pigment content were evaluated at three light levels (4%, 13%, and 58% of ambient sunlight), and two ammonium concentrations (25 and 250 ?M). The growth of Porphyra umbilicalis was higher at 250 ?M than at 25 ?M ammonium (P?0.002), while growth of the other three species were not affected by nitrogen concentration (P>0.05). With the exception of P. leucosticta, plant growth was greatest in high light (58% of ambient). Overall, average growth rates ranged from 31.8 (±2.8)%·day‐1 for P. amplissima to 8.8 (±1.2)%·day‐1 for P. leucosticta. Ammonium uptake rates were consistently higher in 250 than 25 ?M ammonium (P?0.05), except for P. amplissima (P>0.05). Uptake by P. umbilicalis was greatest at high light (P<0.005), but light did not affect uptake rates in the other three species (P>0.05). The phycoerythrin content of P. umbilicalis and P. leucosticta was greater at 250 ?M than 25 ?M ammonium, while it was not affected by nitrogen level in P. linearis and P. amplissima. The phycoerythrin content of all species decreased from low to high light (P<0.05); however, light affected the net phycoerythrin production only in P. leucosticta.
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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".