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Hello Gunnar and Sergiy,

Thanks a lot for your helpful replies. I used bg sentinel traps http://www.bg-sen... modified with loudspeakers playbacking frog calls, as used by Grafe et al. (2008) http://onlinelibr...x/abstract. An alternative is to use CDC traps http://johnwhock....ight-trap/, removing the light and replacing it by a loudspeaker, as used in the studies of Art Borkent. Studies with phonotaxis experiments in Europe would be of great interest, indeed! Lets keep in touch.

Best regards