Variabilität des Paarungsrufes der Geburtshelferkröte,Alytes o. obstetricans

Summary Studying the acoustic behaviour of the midwife toad, the mating call was found to be influenced by the air temperature and the size of the animals. When the air temperature rises the number of calls/min and the basic frequency exhibit a positive linear regression, the duration of the calls a negative linear regression. As the animals grow the frequency decreases while the duration increases.