Intraspecific differences in the effects of salinity and light on growth and prymnesin cell quota in Prymnesium parvum
Bibliographic record
Abstract
The haptophyte Prymnesium parvum produces large polyether compounds (prymnesins) with lytic properties that accumulate in the cell or may be released into the surrounding environment. At high cell abundances the prymnesins cause devastating damage to ecosystems. Blooms of P. parvum are frequently reported in inland water bodies and brackish coastal areas, and thus salinity has been suggested as a main regulatory factor in bloom control. However, toxicity has mainly been assessed through bioassay and the effect of abiotic factors on prymnesin production is lacking. Here, we explore the effect of salinity and light on prymnesin production in three strains of P. parvum. We find that P. parvum can grow over a wide range of salinities, but that net production of cellular prymnesin is, contrary to previous suggestions, inhibited at low salinities, presumably due to resources being diverted to deal with hypoosmotic stress. In two of the strains, increased cellular prymnesin quotas during salinity-induced stress were instead due to accumulation of toxins in the cells because of low cell division rates. We further observed intraspecific differences in cell physiology in response to light. We found general negative relationships between growth rate and cellular prymnesin quotas, both within and among strains. Overall, we find large intraspecific variation in cell physiology in response to salinity and light but demonstrate several general patterns. Such broad intraspecific variation may partly explain the success of various strains of P. parvum in a wide range of environments.
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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) | 0.000 | 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".