Abstract
IN the audio-frequency range, a phenomenon called ‘dawn chorus’, which is characterized by a multitude of rising tones, is frequently observed. Other investigators1,2 have noted that this phenomenon exhibits a pronounced diurnal variation of intensity, with the maximum occurring during the early morning hours, and the name ‘dawn chorus’ has been derived on this basis. The observations of ‘dawn chorus’ reported here were made between January 1 and July 2, 1956, at College, Alaska, with equipment sensitive to frequencies between 1 to 10 kc./s. During this interval, the equipment was in operation on 116 days. ‘Dawn chorus’ was found to be present in 224 of the 2,784 one-minute hourly observing periods. The diurnal variation in the frequency of occurrence of ‘dawn chorus’ is illustrated in Fig. 1, which represents a histogram of the number of times ‘dawn chorus’ was found to be present during the one-minute recording interval for each of the twenty-four hours of the day.
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References
Storey, L. R. O., Phil. Trans. Roy. Soc., A, 246, 113 (1953).
Allcock, G. McK., and Martin, L. H., Nature, 178, 937 (1956).
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POPE, J. Diurnal Variation in the Occurrence of ‘Dawn Chorus’. Nature 180, 433 (1957). https://doi.org/10.1038/180433a0
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DOI: https://doi.org/10.1038/180433a0
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