Modern microbialites harbor an undescribed diversity of chromerid algae
Bibliographic record
Abstract
Abstract Chromerid algae and the heterotrophic colpodellids together make up the chrompodellids, which are the closest known relatives to apicomplexan parasites [1]. As apicomplexans are prolific parasites of animals, including humans, their adaptation to parasitism from algal ancestors has garnered significant interest, and chromerids were instrumental in elucidating that evolution [2-5]. But the chromerids were also the first new algal group discovered in 100 years [2], and because so much attention has focused on comparisons with apicomplexans, the ecology of chromerid algae has remained surprisingly mysterious. They have predominately been considered to live only in association with corals, initially as intracellular coral symbionts. To test for a wider distribution of chromerids in nature, we have used plastid metagenomic binning combined with re-analysis of 18S rRNA metabarcoding data, which both support an expanded biogeographic range and ecological niche of chromerid algae by showing they are consistent associates of modern microbialites across the globe. Specifically, a broad and undescribed diversity of chromerid lineages is found in marine and also freshwater microbialites. This includes the recovery of a near-complete V. brassicaformis plastid genome and a second incomplete plastid genome from a new chromerid lineage from Highborne Cay thrombolites. This is the first concrete evidence that this under-sampled algal lineage lives outside some association with coral, including freshwater habitats, and sheds new light on the diversity and ecological range of the most recently discovered algal lineage.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".