The occurrence of the North Pacific diatom Neodenticula seminae in the North Atlantic during the Pleistocene with a correlation to planktonic foraminifera at ODP Site 983.
Bibliographic record
Abstract
The middle to high latitude North Pacific diatom Neodenticula seminae appeared in the North\nAtlantic between the ages of ~1.2 and -0.8 Ma. It has recently been rediscovered in the North\nAtlantic during Continuous Plankton Recorder surveys (CPR) in the Labrador Sea which\nsuggests that the same climatic conditions that were present in the early to mid-Pleistocene\nare now re-occurring during modem times allov^ng North Pacific currents to make their way\nthrough the Canadian Archipelago and/or Fram Strait, through Arctic waters and mto the\nNorth Atlantic. Forty four sediment samples were processed and analysed from ODP Site\n983, Hole 983A for planktonic foraminifera abundances and then compared against the FO\nand LO of Neodenticula seminae within the early to mid-Pleistocne (-1.2 to -0.8 Ma). The\nmost significant taxa: Neogloboquadrina pachyderma (mean 48.71%), Neogloboquadrina\nincompta (mean 22.86%), and Turborotalita quinqueloba (mean 8.59%) revealed a tripartite\nresponse to changes in sea temperatures with N. pachydrma showing an inverse relationship\nto N. incompta. These findings were then correlated against an age model and three main\nintervals within the stratigraphic imit based on the FO and LO of Neodenticula seminae.\nThe interval shown in-between the FO and LO of N. seminae does seem to show a pulse of\ncolder water that entered the North Atlantic between -1.2 and -0.8 Ma as shown by the high\nabundances of N. pachyderma, but due to the high amount of barren samples aroimd the\nboimdaries, there is no way of separating any cold pulse of Arctic water, caused by glacial\nmelting, from the background glacial/interglacial signal shown by the age model. It is\ntherefore recommended that further investigations should be applied to constraining the\ndefmite age of N. seminae and repeating studies using a smaller size fraction (<125 |xm)\nand/or benthic foraminifera.
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 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 | 0.001 |
| 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) | 0.000 | 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".