Rapid shift in zooplankton community composition on the northeast Pacific shelf during the 19981999 El Niño La Niña event
Bibliographic record
Abstract
The 19971998 El Niño was one of the strongest ocean warming events in the historical record followed by an equally strong cold La Niña event in 1999. We observed a rapid shift in the marine zooplankton assemblage found in the transitional area between the California Current domain and the Alaska Gyre domain. Nonmetric multidimensional scaling revealed that the shift in species composition was caused primarily by changes in the relative abundance of subtropical neritic copepods normally found in the California Current domain. In 1998, the subtropical neritic copepods Paracalanus, Ctenocalanus, and Corycaeus were found as far north as 56°N and occurred in 100%, 96%, and 51% of 1998 samples versus 16%, 5%, and 3% of 1999 samples. The type and magnitude of change were similar to those observed off central Oregon but differed from those observed in southeast Alaska. Results support the hypothesis that anomalous poleward transport can inject significant California Current water into the coastal circulation of the Alaska Gyre and suggest that alongshore connectivity between the two domains may extend farther to the north than previously thought.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.001 | 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".