Host specificity of the endophytic sporophyte phase of Acrosiphonia (Codiolales, Chlorophyta) in southern British Columbia, Canada
Bibliographic record
Abstract
We investigated the host specificity of Acrosiphonia’s (Codiolales, Chlorophyta) endophytic sporophyte phase, previously identified as Chlorochytrium inclusum and Codiolum petrocelidis. In southern British Columbia, Canada, ‘Chlorochytrium inclusum’ is abundant in the foliose red alga, Mazzaella splendens, whereas ‘Codiolum petrocelidis’ densely colonizes the red algal crust, Petrocelis franciscana. Examination of foliose and crustose algae revealed a wide range of alternate hosts for Acrosiphonia sporophytes. Three foliose red algae, M. heterocarpa, M. sanguinea and Sparlingia pertusa, and two crustose algae, Raifsia pacifica and Hildenbrandia occidentalis, are newly reported hosts for ‘Chlorochytrium’ and ‘Codiolum’. This is the first study to report ‘Codiolum’ colonization of a brown alga (= Raifsia), and foliose brown and green algae have never been reported to be colonized by ‘Chlorochytrium’. ‘Codiolum’ demonstrated a greater affinity for Petrocelis than for other coexisting crustose algae, and ‘Chlorochytrium’ colonized some foliose red algal species more frequently than others. Endophyte density data suggest that variations in structural composition among host species (i.e. how closely appressed the filaments are in crusts, and the compactness in the cells of the cortex and medulla of foliose red algae) may be important in determining the ease of penetration by the endophyte. Host cell wall composition is suspected to play a role in preferential colonization by ‘Chlorochytrium’. Carrageenophytes and carragar-producing hosts were colonized by higher densities of ‘Chlorochytrium’ than were agarophytes. The hypothesis that host life history phases might be differentially susceptible to colonization by endophytes was not supported in our study; among host species with an alternation of generations neither the gametophytes nor the sporophytes seemed to be consistently more heavily colonized.
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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) | 0.005 | 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".