C. compactum acts as a comprehensive climate archive and ecological foundation in the Labrador Sea
Bibliographic record
Abstract
Clathromorphum compactum, a species of crustose coralline algae (CCA), is incredibly valuable for the future of high latitude ocean health, both as a comprehensive archive of changing ocean conditions, and ecologically as a foundational species for promoting biodiversity. Previous work establishes C. compactum as an effective climate proxy, and its life history provides several advantages for this use. C. compactum grow in nongeniculate, generally radial formations on hard substrates, over a wide distribution in mid-to-high latitude oceans and at subtidal depth ranges. Indeterminate growth leads to extreme longevity in C. compactum (Halfar et al., 2008), and growth rates are relatively constant over its life span, resulting in well-defined increments. A high-Mg calcite skeleton provides an elemental ratio of Mg/Ca that directly correlates with SST; as temperatures rise, Mg manifestation levels in skeletal material rise (Adey et al., 2015; McCoy & Kamenos, 2015; Williams et al., 2018). The species is thus an established, specific, and accurate climate proxy. C. compactum also acts as an indicator of broader ecosystem health, where its presence serves as a foundation for subtidal ecological communities and as a binding agent for broader reefal ecosystems. Its decay indicates ocean conditions are unfit for upkeep of marine calcifiers. Because past research has established several methods for acquiring proxy temperature data from marine calcifiers, my goal was to find evidence of recent warming trends at a high latitude (53⁰ 17.6' N) ocean site in C. compactum skeletal material, and to connect its value as a vital ecosystem foundation to its value as a climate archive. I found that Mg/Ca and d18O content of specimen 10-21_15-17_1 both reflected SST increase in the past 22 years. Despite increased Mg manifestation, growth rates did not correlate with SST or time. This outcome reaffirms C. compactum’s effectiveness in manifesting changes in ocean temperature, but lack of growth rate correlation suggests that C. compactum may be reaching its threshold of heat and acidity tolerance.
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 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.002 |
| 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".