Hexactinellid Sponge Reefs on the Canadian Continental Shelf: A Unique "Living Fossil"
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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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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 | 0.001 | 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 | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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 it