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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Vocalisation behavior in European treefrog (\kur{Hyla arborea}): Does the social context influence male calling patterns?
 BODNÁR, Tomáš
In this study I investigate for two consecutive breeding seasons male calling patterns in natural population of European treefrog (Hyla arborea), a hylid frog with prolonged breeding season and a lek mating system. I tested the hypothesis that males modify their vocal behavior in different ways when faced with stimuli of competitors with various body size. Further here, the influence of water temperature and size of advertising males on their call properties were concerned.
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Song as a signal of competitive ability and motivation in Chiffchaff
 JAŠKA, Pavel
The basic aim of the thesis was testing the role of song length and syllable rate in male {--} male interactions in chiffchaff (Phylloscopus collybita). I looked for correlations between morphological measurements and vocal characteristics. I also presented stimuli manipulated in length and syllable rate to the chiffchaff males in the field playback experiments.
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