Possible ªRain callº selection in the Chaffinch (Fringilla coelebs) by noise intensity ± an investigation of a hypothesis Bergmann et al. (1988) formed the tentative hypothesis that the spatial distribution of different ªrain callº dialects in the Chaffinch (Fringilla coelebs) could be caused by the acoustic environment. In concrete terms, it was supposed that the ªhuitº call was used predominantly in urban districts with a high level of traffic noise because this type of sound is more capable of penetrating the traffic noise. In order to test this hypothesis, a study was conducted in the towns Remscheid, Solingen and Wuppertal. Analysis of traffic noise showed that the sound pressure decreases with ascending frequency and reaches an insignificant value between 4,0 and 5,0 kHz. In view of the hearing capability of the Chaffinch it seemed that ªrain callsº with frequencies of 4,5 to 7,0 kHz are best for piercing traffic noise. However, the main frequencies of the ªhuitº call do not exceed 4,2 kHz, which means that an adaptation to traffic noise is improbable. In addition to this the rain calls of different dialects were classified into noise zones. No dependence of dialect on traffic noise intensity could be established. Summing up, the cautious hypothesis of Bergmann et al. (1988) could not be corroborated. Zusammenfassung Bergmann et al. (1988) haben die ¹vorsichtige Hypotheseª aufgestellt, daû fu Èr die ra Èumliche Verteilung der unterschiedlichen Dialekte des Regenrufes (Brutzeitrufes) des Buchfinken (Fringilla coelebs) die akustische Umwelt mit verantwortlich sein ko Ènnte. Konkret wurde vermutet, daû der ¹huitª-Ruf bevorzugt in sta Èdtischen Gebieten mit hoher Verkehrsla Èrmbelastung benutzt wird, da dieser reintonige Dialekttyp La Èrmbereiche besonders gut durchdringen wu Èrde. Zur Pru Èfung dieser Hypothese wurde in den kreisfreien Sta Èdten Remscheid, Solingen und Wuppertal eine Untersuchung durchgefu Èhrt. Analysen des Verkehrsla Èrms ergaben, daû mit zunehmender Frequenz der Schalldruck abnimmt und zwischen 4,0 und 5,0 kHz auf einen unbedeutenden Wert abfa Èllt. Fu Èr die Durchdringung von Verkehrsla Èrm durch Regenrufe werden unter Beru Ècksichtigung der Ho Èrfa Èhigkeit eines Buchfinken 4,5 bis 7,0 kHz als optimal angesehen. Da die Hauptfrequenz des ¹huitª-Rufes nicht 4,2 kHz u Èberschreitet, ist eine Adaptation an den Verkehrsla Èrm unwahrscheinlich. Auûerdem wurden die Regenrufe unterschiedlicher Dialekte den einzelnen La Èrmbelastungszonen zugeordnet. Es konnte keine Abha Èngigkeit der Dialekttypen von der La Èrmbelastung festgestellt werden. Insgesamt konnte die ¹vorsichtige Hypotheseª von Bergmann et al. (1988) nicht besta Ètigt werden.
Summary Possible “Rain call” selection in the Chaffinch (Fringilla coelebs) by noise intensity an investigation of a hypothesis Bergmann et al. (1988) formed the tentative hypothesis that the spatial distribution of different “rain call” dialects in the Chaffinch (Fringilla coelebs) could be caused by the acoustic environment. In concrete terms, it was supposed that the “huit” call was used predominantly in urban districts with a high level of traffic noise because this type of sound is more capable of penetrating the traffic noise. In order to test this hypothesis, a study was conducted in the towns Remscheid, Solingen and Wuppertal. Analysis of traffic noise showed that the sound pressure decreases with ascending frequency and reaches an insignificant value between 4,0 and 5,0 kHz. In view of the hearing capability of the Chaffinch it seemed that “rain calls” with frequencies of 4,5 to 7,0 kHz are best for piercing traffic noise. However, the main frequencies of the “huit” call do not exceed 4,2 kHz, which means that an adaptation to traffic noise is improbable. In addition to this the rain calls of different dialects were classified into noise zones. No dependence of dialect on traffic noise intensity could be established. Summing up, the cautious hypothesis of Bergmann et al. (1988) could not be corroborated.
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