Regent Distribution and Status of Nesting Bald Eagles in Baja California, Mexico
Bibliographic record
Abstract
ABSTR•CT.--Westudied Bald Eagles (Haliaeetus leucocephalus) nesting in Baja California, Mexico, and vicinity from 1983-1993.The range of nesting Bald Eagles in Baja California has been reduced from a scattering of pairs along both the Pacific and Gulf sides to a remnant population in Magdalena Bay where no more than three pairs were found annually.Low numbers and a restricted distribution make this disjunct population especially vulnerable to human disturbance.Additional protection of present nesting localities and a reintroduction program on remote islands in the Gulf of California, where eagles historically nested, are proposed.Limited data on nesting success indicate that the Magdalena Bay population is reproducing successfully with young probably dispersing north following fledging.The Bald Eagles found wintering along the Colorado River Delta in January apparently nest farther north in the United States or Canada.Distribuci6n reciente y status de nidificaci6n de Haliaeetus leucocephalus, en Baja California, M•xico RESUMEN.--Estudiamosla nidificaci6n de Haliaeetus leucocephalus en Baja California, M6xico yen sus veciandades, desde 1983 a 1993.El rango de nidificaci6n de H. leucocephalus en Baja California se ha redicido tanto en la vertiente Pacifico como en lado del Golfo a una poblaci6n remanente en Bahia Magdalena, donde no se encuentran mils de tres pares anualmente.Bajos nfmeros y una restringida distribuci6n, hacen que esta poblaci6n disyunta sea vulnerable a la perturbaci6n humana.Proponemos programas adicionales de protecci6n de las actuales 1ocalidades de nidificaci6n y un programa de rein-troducci6n en islas remotas del Golfo de California, donde hist6ricamente han anidada las figuilas.Datos limitados sobre nidificaci6n exitosa indican que la poblaci6n de Bahia Magdalena se reproduce exitosamente con juveniles que probablemente se dispersan al norte.Haliaeetus leucocephalus se encuentra invernando a 1o largo del delta del Rio Colorado en enero, aparentemente nidifica mils al norte, en los Estados Unidos o Canada.[Traducci6n de Ivan Lazo] Henny et al. (1978) confirmed recent Bald Eagle (Haliaeetus leucocephalus) nesting in the Magdalena Bay region of Baja California in 1977 (Fig. 1).On 26 March 1977, a pair with two large young in a nest was noted near San Jorge (25ø34'N, 112ø6'W); hereafter abbreviated as (2534-11206), north of Santo Domingo (nest F); on 27 March, a pair with one large young in a nest was seen on Isla Creciente near Almejas Bay (nest A).They also summarized unpublished sight records from 1962, 1971, and 1972 that indicated a continued presence in Magdalena Bay and suspected continued nesting prior to their 1977 rediscovery.In this paper we: (1) describe the historical nesting population of Bald Eagles in Baja California and vicinity (Gulf of California), (2) evaluate the present nesting population (new data for 1983-1993) in relation to the historical population, (3) present recent productivity information, and (4) describe a wintering population in the vicinity of the Colorado River Delta.METHODS Three aerial survey types are reported in this paper.(1) A survey was flown by Henny and Anderson (1979) between 23 March and 1 April 1977 of all of coastal Baja 203
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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) | 0.002 | 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".