Autogamic reproductive behavior and sex cell structure in Thalassiosira angulata (Bacillariophyta)
Why this work is in the frame
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Bibliographic record
Abstract
Our understanding of diatom reproduction is limited, especially for marine planktonic centric diatoms. This project aimed to elucidate sexual behavior and gametogenesis in the mediophycean diatom, Thalassiosira angulata, and to determine the fine structure of its reproductive cells. A monoclonal culture of T. angulata was successfully induced and enumerated, and all stages of auxosporulation documented. Spermatogenesis was absent in all inductions. Nuclear behavior of the auxospore mother cell (AMC) during auxosporulation indicated that reproduction was autogamic. In our clone, reproduction began with a differentiating mitosis and subsequent pervalvar expansion of the AMC, a meiocyte. The smaller cell often continued normal vegetative growth. In the AMC, meiosis I was acytokinetic and resulted in one viable haploid and one pycnotic nucleus. Meiosis II resulted in the production of two viable haploid nuclei, which we postulate later fused to produce the zygotic nucleus. Cell expansion was observed in very young AMCs both prior to and following autosyngamy. The initial cell valves were produced after at least two acytokinetic and pycnotic mitotic divisions, after which the cell was capable of undergoing its first normal mitosis involving production of two sibling hypovalves.
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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 it