Relict Populations of Drefianofius bungei and Limnocalanus macrurus grimaldii (Copepoda: Calanoida)
Bibliographic record
Abstract
ABSTRACT. L. m. grimaldii and D. bungei live in the freshwater layer of a meromictic lake on northern Ellesmere Island containing trapped sea water below 60 m. Carbon-14 measurements indicate the lake has not communicated with the open sea for 3,000 years. D. bungei also lives in the freshwater layer of Disraeli Fiord. This is the first report of this copepod occurring outside the Siberian Arctic. L. m. grimaldii, also rare in the Canadian Arctic, usually occurs near large river mouths, but has been found in a few arctic lakes and coastal lagoons. The present disjunct distribution of these species is evidence of their former more general dispersion in the Arctic during times when brackish water was more widespread. Although isolated for 3,000 years, the lake population has evolved only slightly if at all towards the freshwater form with a more highly vaulted forehead: L. m. macrurus. RÉSUMÉ. Reliquats de populations de Drepanopus bungei et de Limnocalanus macrurus grimaldii (Copepoda: Calanoida) de l'île d'Ellesmere, T. du N.-O. L. m. grimaldii et D. bungei vivent dans la couche d'eau douce d'un lac méromictique du nord de l'île d'Ellesmere, dont la couche inférieure (> 60 m) est formée d'eau de mer. Des mesures au C-14 indiquent que ce lac n'a pas com-muniqué avec la pleine mer depuis 3,000 ans. On retrouve aussi D. bungei dans la couche d'eau douce du fjord de Disraeli. I1 s'agit ici de la première mention de ce copépode en dehors de l'Arctique sibérien. L. m. grimaldii, rare aussi dans l'Arcti-que canadien, apparaît généralement près des embouchures des grandes rivières, mais on l'a trouvé dans quelques lacs arctiques et lagunes côtières. L'actuelle distri-bution dispersée de ces espèces est la preuve de leur ancienne dispersion plus géné-rale par tout l'Arctique, aux époques où l'eau saumâtre était beaucoup plus répan-due. Bien qu'isolée depuis 3,000 ans, cette population lacustre n'a que très peu évolué vers la forme d'eau douce avec un front plus voûté: L. m. macrurus. PE3I0ME. Penuxmosue nonynxyuu Drepanopus bungei u Limnocalanus macrurus grimaldii (Copepoda: Calanoida) c o. 3ncxupa (Cesepo-sanaaxue meppumopuu).
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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 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".