Winter Abundance Trends for the Oregon Vesper Sparrow in California
Bibliographic record
Abstract
Christmas Bird Count data from California over the past three decades (1994 through 2023) show that the Oregon Vesper Sparrow (Pooecetes gramineus affinis) is likely in long term winter decline in this region. Considering that the bulk of the population of this taxon winters in California, and the documented declines within its breeding range, this negative winter region trend underscores the need for a concerted effort to conserve this subspecies. The winter range of this taxon overlaps with that of P.g. confinis in California. However, most of the Oregon Vesper Sparrow population winters north of Santa Barbara County with smaller numbers in southern California. We used Christmas Bird Count data to document a significant decline in wintering Vesper Sparrows throughout the state, with significant declines in northern portions of the state and apparently stable numbers in the south. Thus, our results are consistent with a declining winter population of the Oregon Vesper Sparrow. The decline in Vesper Sparrow numbers recorded in northern California CBCs is associated with a decline in grassland/open habitat within count circles, suggesting that winter habitat loss may be contributing to population decline.
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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 | 0.000 | 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".