Hexactinellid Sponge Reefs on the Canadian Continental Shelf: A Unique "Living Fossil"
Bibliographic record
Abstract
Globally unique hexactinellid (siliceous) sponge reefs, found in deep (200 m), glacially scoured troughs of the western Canadian continental shelf, have been explored by a manned submersible. Submersible observations and geophysical data allow examination of the physical and biological processes that have shaped the sponge reefs, which began to form about 9 thousand years (k.y.) ago. The mounds (bioherms) and sheet-like accumulations (biostromes) cover a low-angle, non-depositional, iceberg-scoured seafloor, relict since the deglaciation of the region. Biohermal structures are up to 19 m in height, and are covered with hexactinosan sponges up to 1.5 m tall, creating abenthic habitat that discontinously covers roughly 700 km 2 . Similar to extinct siliceous sponge reefs, mud mounds, and reef mounds that were widespread during the Mesozoic, the modern reefs are like aliving fossil and provide a unique modern analogue. Fishing activities, especially trawling or bottom dragging, have damaged the slow-growing reefs insome areas. Resume Uniques au monde, les recifs d'eponges d'hexactinellides (siliceux) qui se trouvent a 200 m de profondeur dans des fosses d'abrasion glaciaires du plateau continental de l'Ouest du Canada, ont ete explores a partir de sous-marins habites. Les observations sous-marines et les donnees de geophysique permettent d'etudier les mecanismes physiques et biologiques qui ont preside a l'edification des recifs d'eponges qui ont commence a se former aux environs de 9 ka  P. Ces edifices recifaux en amas (biohermes), et en couches (biostromes) recouvrent un fond marin legerement incline par l'abrasion d'icebergs post-glaciaires. Ces biohermes ont jusqu'a 19 m de hauteur et sont recouverts d'une couche de 1,5 m de hauteur d'eponges hexactinellidiennes, forment un habitat couvrant de maniere discontinue une surface de 700 km 2 . Semblables a ces recifs d'eponges tres repandus au Mesozoiques, amas boueux et amas recifaux, les recifs modernes sont de veritables fossiles vivants, et sont a ce titre forts utiles pour la comprehension de leurs contreparties fossiles. Par endroits, les activites de peche industrielle, particulierement le chalutage ou le dragage de fond ont endommage ces edifices recifales a croissantes lentes.
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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 | 0.002 |
| Science and technology studies | 0.003 | 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) | 0.004 | 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".