Tropical Ecology and Conservation [Monteverde Institute]

Creator

Kristin Bondo

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Publication Date

September 2002

Abstract

A study of the Common Pauraque (Nyctidromus albicollis) was conducted in an area of Costa Rica that has a pronounced dry season. The mean frequency of calls per minute, number of consecutive minutes of calls, and starting times of vocalizations at dusk were recorded. The mean frequency of Common Pauraque calls per minute, number of consecutive minutes of calls, and maximum number of calls per minute were not direct functions of percent moon face illumination, (Regression, R2 = 0.064, p = 0.1366; Regression, R2 = 0.257, p = 0.0269; Regression, R2 = 0.095, p = 0.2286) respectively. This suggests that weather, breeding, and insect populations may be involved, in relationwith the moon, in influencing vocalizational patterns of the Common Pauraque. The number of consecutive calls was greatest on nights where the rising of the moon overlapped with dusk. The lengthening of time during which these birds could call, especially near the equator where dusk lasts at most for 39 minutes, may explain why early accounts have related calling with the phase and brightness of the moon. Se hizo un estudio del Cuyeo (Nyctidromus albicollis) en una área de Costa Rica que tiene una estación seca pronunciada. El promedio de la frecuencia de las llamadas durante un minuto, el número de llamadas consecutivas y los tiempos cuando las vocalizaciones empezaron fueron anotados. El promedio de la frecuencia de llamadas del Cuyeo durante un minuto, el número de llamadas consecutivas y el número máximo de llamadas durante un minuto no fueron funciones directas del porcentaje de la iluminación de la cara de la luna, (Regression, R2 = 0.064, p = 0.1366; Regression, R2 = 0.257, p = 0.0269; Regression, R2 = 0.095, P = 0.2286) respectivamente). Esto sugiere que el tiempo, la crianza y las poblaciones de insectos pueden ser involucrados, en relación con la luna, en la predicción de la vocalización del Cuyeo. El número de llamadas consecutivas fue mayor durante las noches donde la salida de la luna coincidió con el atardecer. El prolongamiento del tiempo durante lo cual estas aves pueden llamar, especialmente cerca del ecuador donde el atardecer dura un máximo de 39 minutos, puede explicar porque desuipinones previas han relacionada las llamadas con la fase y la iluminación de la luna.

Description

Student affiliation: Department of forestry and natural resources, Purdue University, West Lafayette Digitized by MVI

Holding Location

Monteverde Institute MVI

Identifier

M39-00108

The influence of light intensity of the moon on the calling behavior of the common pauraque (Nyctidromus albicollis) during moonlit and twilight hours

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