CHARACTERISTICS OF THE WING SOUNDS OF FOUR HUMMINGBIRD SPECIES THAT BREED IN CANADA
Bibliographic record
Abstract
In contrast to vocalizations, nonvocal avian sounds have received little attention as potential means of communication. The high wing-beat frequency of hummingbirds in concert with the modified flight feathers of some species, generate sounds with the potential to play a role in communication. Technological limitations of previous studies have compromised assessment of the acoustic characteristics and importance of these sounds. This study was designed to record and analyze the sex-specific wing sounds of four hummingbird species, in order to provide a framework for further communication studies. We collected digital recordings of hummingbirds during hover flight and analyzed these with computer-based sound software. Our results showed that (1) males of all four species had higher wing-beat frequencies than conspecific females; (2) there was greater intra- and interindividual variation in wing-beat frequency than previously documented; (3) though not specifically tested, the sexual dimorphism and interspecific differences in wing-beat frequency support previous findings that wing-beat frequency is inversely related to wing length; and (4) that digital sound analysis is a powerful new tool for detailed study of wing sounds. We provide the first description of a characteristic behavior, which we have called the ‘Cobra’, in which an individual dramatically increases its wing-beat frequency. Finally, we have significantly expanded understanding of the wing trill sound produced by the modified outer primary feathers, and have shown that female Black-chinned Hummingbirds (Archilochus alexandri) also produce wing trill components despite previous beliefs that these were unique to male hummingbirds. Características de los Sonidos de las Alas de Cuatro Especies de Picaflores que Crían en Canadá Resumen. A diferencia de las vocalizaciones, los sonidos no-vocales de las aves han recibido poca atención como medios potenciales de comunicación. Las altas frecuencias de aleteo de los picaflores, en conjunto con las plumas modificadas para el vuelo de algunas especies, generan sonidos que tienen el potencial de jugar un rol en la comunicación. Las limitaciones tecnológicas de los estudios previos han dificultado la evaluación de las características acústicas y de la importancia de estos sonidos. Este estudio fue diseñado para grabar y analizar los sonidos de las alas específicos de cada sexo en cuatro especies de picaflores con el objetivo de sentar las bases para futuros estudios de comunicación. Colectamos grabaciones digitales de picaflores durante el vuelo suspendido y las analizamos en computadoras con programas de sonido. Nuestros resultados mostraron que: (1) los machos de las cuatro especies tuvieron frecuencias de aleteo más altas que las hembras coespecíficas; (2) existió variación intra- e inter-individual en la frecuencia de aleteo mayor que la documentada previamente; (3) aunque no fue evaluado específicamente, el dimorfismo sexual y las diferencias inter-específicas en la frecuencia de aleteo apoyan hallazgos anteriores que relacionan inversamente la frecuencia de aleteo con la longitud de las alas; y (4) que el análisis digital de los sonidos es una nueva herramienta de gran utilidad para el estudio detallado de los sonidos de las alas. También brindamos la primera descripción de un comportamiento característico que nosotros llamamos ‘Cobra’, en el cual un individuo aumenta dramáticamente la frecuencia de aleteo. Finalmente, hemos incrementado de modo significativo el conocimiento del sonido producido por las plumas primarias externas modificadas y hemos mostrado que las hembras de Archilochus alexandri también producen sonidos con las alas, a pesar de que anteriormente se creía que éstos eran exclusivos de los picaflores machos.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 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) | 0.000 | 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 teacher head, 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".