Abstract：
:In dense mating aggregations, such as leks and choruses, acoustic signals produced by competing male conspecifics often overlap in time. When signals overlap at a fine temporal scale the ability of females to discriminate between individual signals is reduced. Yet, despite this cost, males of some species deliberately overlap their signals with those of conspecifics, synchronizing signal production in the chorus. Here, we investigate two hypotheses of synchronized mating signals in a Japanese treefrog (Buergeria japonica): (1) increased female attraction to the chorus (the beacon effect hypothesis) and (2) reduced attraction of eavesdropping predators (the eavesdropper avoidance hypothesis). Our results from playback experiments on female frogs and eavesdropping micropredators (midges and mosquitoes) support both hypotheses. Signal transmission and female phonotaxis experiments suggest that away from the chorus, synchronized calls are more attractive to females than unsynchronized calls. At the chorus, however, eavesdroppers are less attracted to calls that closely follow an initial call, while female attraction to individual signals is not affected. Therefore, synchronized signalling likely benefits male B. japonica by both increasing attraction of females to the chorus and reducing eavesdropper attacks. These findings highlight how multiple selective pressures likely promoted the evolution and maintenance of this behaviour. This article is part of the theme issue 'Synchrony and rhythm interaction: from the brain to behavioural ecology'.
journal_name
Philos Trans R Soc Lond B Biol Scijournal_title
Philosophical transactions of the Royal Society of London. Series B, Biological sciencesauthors
Legett HD,Aihara I,Bernal XEdoi
10.1098/rstb.2020.0340keywords:
["acoustic communication","beacon effect","eavesdroppers","predator avoidance","relaxed selection","synchrony"]subject
Has Abstractpub_date
2021-10-11 00:00:00pages
20200340issue
1835eissn
0962-8436issn
1471-2970journal_volume
376pub_type
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