Auteur(s): Kristīne Igaune, Indriķis Krams, Tatjana Krama, Jadviga Bobkova
Bron: JOURNAL OF AVIAN BIOLOGY (OnlineEarly Articles)
Abstract: Mating calls of animals are often detected by unintended receivers which use sexual signals to obtain information about the signaller. We investigated whether white storks Ciconia ciconia can eavesdrop mating calls of moor frogs Rana arvalis.
White storks are dependent on moor frog abundance in early breeding
season. Interspecific eavesdropping by predators is common and well
documented in tropical anurans, whereas it is less known in temperate
zone. We compared the frequency of approaches of white storks to
loudspeakers when frog calls and the song thrush Turdus philomelos
songs were simultaneously played back using the later as controls. The
loudspeaker broadcasting the calls of male moor frogs clearly attracted
white storks at 22 out of 84 nests. The bird songs attracted white
storks in only one case. In 19 cases birds left the nest for unknown
reasons which were considered as potential foraging movements. The
results of this field experiment report a new case of eavesdropping on
acoustic signals showing that advertisement calls of temperate moor
frogs are an important stimulus for white storks.
Bron: JOURNAL OF AVIAN BIOLOGY (OnlineEarly Articles)
Abstract: Mating calls of animals are often detected by unintended receivers which use sexual signals to obtain information about the signaller. We investigated whether white storks Ciconia ciconia can eavesdrop mating calls of moor frogs Rana arvalis.
White storks are dependent on moor frog abundance in early breeding
season. Interspecific eavesdropping by predators is common and well
documented in tropical anurans, whereas it is less known in temperate
zone. We compared the frequency of approaches of white storks to
loudspeakers when frog calls and the song thrush Turdus philomelos
songs were simultaneously played back using the later as controls. The
loudspeaker broadcasting the calls of male moor frogs clearly attracted
white storks at 22 out of 84 nests. The bird songs attracted white
storks in only one case. In 19 cases birds left the nest for unknown
reasons which were considered as potential foraging movements. The
results of this field experiment report a new case of eavesdropping on
acoustic signals showing that advertisement calls of temperate moor
frogs are an important stimulus for white storks.
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