NOTES: FIRST NESTING RECORD OF THE BLACK-BELLIED WHISTLING-DUCK ON THE BAJA CALIFORNIA PENINSULA, MEXICO
Bibliographic record
Abstract
The Black-bellied Whistling-Duck (Dendrocygna autumnalis) ranges from the southern United States to northwestern Peru, Argentina, and Brazil, occupying lakes and shallow freshwater marshes in the tropical and subtropical zones (A.O.U. 1998). It is a largely nocturnal species that often forms small groups, nests at heights of up to 3 m in large trees, and feeds on aquatic plants, cultivated grains, and seeds (Alsop 2001). Although the species is generally nonmigratory, extralimital records (some of which probably involve escapees) are scattered across the United States to southern Canada, as well as parts of Mexico outside of the normal range (James and Thompson 2001). The Baja California Peninsula is not part of the Black-bellied Whistling-Duck’s historical range (Grinnell 1928, Wilbur 1987), but Howell and Webb (1992) reported one at San José del Cabo in June 1999, Carmona et al. (1999) reported four at Lagunas de Chametla, within the city of La Paz (11 and 12 December 1997; 14 February and 4 March 1998), and Erickson et al. (2001) reported additional sightings at both locations from 1992 to 1998. This paper updates the species’ status in La Paz since that time and documents the first breeding records for the peninsula.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.008 |
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; both teacher heads agree on what is shown here.
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".