Life history stage ratios of Iridaea cordate and factors controlling these ratios in intertidal populations
Bibliographic record
Abstract
Two populations of Iridaea cordata (Turner) Bory in Vancouver Harbour, Vancouver, British Columbia were examined. Both of the populations alternate between diploid dominance in the winter and haploid dominance in the summer. There was a significant difference between the ratio of diploid to haploid plants at the two sites. The alternation in dominance observed in the population as a whole was also seen in three different size classes (<5cm, 5-15cm and >20 cm) examined. Clearance experiments done in the field indicate that it can take up to 1 year for Iridaea to recolonize a disturbed area. When recolonization does occur the ratio of diploid to haploid plants mirrors the ratio at the time of clearing, not the ratio at the time of regrowth. This suggests that the spores settle when the rocks are cleared but remain dormant until conditions allow for growth and formation of upright plants. The influence of apomeiosis on the number of diploid plants is probably negligible, since only 2% of cultured tetraspores showed evidence of this phenomenon. Some physical characteristics of Iridaea, bearing on reproduction were also explored. Tetrasporophytes and gametophytes have significantly different surface areas, with the gametophytes being larger, and they have significantly different densities of reproductive structures, with the tetrasporophytes having more. As a result, both plant types have statistically the same net number of reproductive structures per plant. There was little difference with respect to surface area or density of reproductive structures between the high and low intertidal plants of either ploidy.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".