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dc.contributor.authorDemartsev, Vlad
dc.contributor.authorGordon, Naomi
dc.contributor.authorBarocas, Adi
dc.contributor.authorBar Ziv, Einat
dc.contributor.authorIlany, Tchia
dc.contributor.authorGoll, Yael
dc.contributor.authorIlany, Amiyaal
dc.contributor.authorGeffen, Eli
dc.date.accessioned2020-04-29T21:30:33Z
dc.date.available2020-04-29T21:30:33Z
dc.date.issued2019
dc.identifier2056-3744
dc.identifier.doi10.1002/evl3.147
dc.identifier.urihttp://hdl.handle.net/20.500.12634/117
dc.description.abstractThe efficiency of informational transfer is one of the key aspects of any communication system. The informational coding economy of human languages is often demonstrated by their almost universal fit to Zipf's “Law of Brevity,” expressing negative relationship between word length and its usage frequency. Animal vocal systems, however, provided mixed results in their adherence to this relationship, potentially due to conflicting evolutionary pressures related to differences in signaling range and communicational needs. To examine this potential parallel between human and animal vocal communication, and also to explore how divergent, sex-specific, communicational settings affect signaling efficiency within a species, we examined the complete vocal repertoire of rock hyraxes (Procavia capensis). As male and female hyraxes differ in their sociality levels and male hyraxes vocal repertoire is dominated by sexual advertisement songs, we hypothesized that sex-specific vocal repertoires could be subjected to different signaling optimization pressures. Our results show that the sexes differ in repertoire size, call usage, and adherence to coding efficiency principles. Interestingly, the classic call length/call usage relationship is not consistently found in rock hyraxes. Rather, a negative relationship between call amplitude and call usage is found, suggesting that the efficiency of the vocal repertoire is driven by call amplitude rather than duration. We hypothesize that, in contrast to human speech that is mainly intended for short distance, the need for frequent long-range signaling shapes an animal's vocal repertoire efficiency according to the cost of call amplitude rather than call length. However, call duration may be a secondary factor affecting signaling efficiency, in cases where amplitude is under specific selection pressures, such as sexual selection.
dc.language.isoen
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1002/evl3.147
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectROCK HYRAXES
dc.subjectVOCALIZATIONS
dc.subjectSONG
dc.subjectSOCIAL HIERARCHIES
dc.titleThe “Law of Brevity” in animal communication: Sex-specific signaling optimization is determined by call amplitude rather than duration
dc.typeArticle
dc.source.journaltitleEvolution Letters
dc.source.volume3
dc.source.issue6
dc.source.beginpage623
dc.source.endpage634
refterms.dateFOA2020-05-04T18:20:54Z
html.description.abstractThe efficiency of informational transfer is one of the key aspects of any communication system. The informational coding economy of human languages is often demonstrated by their almost universal fit to Zipf's “Law of Brevity,” expressing negative relationship between word length and its usage frequency. Animal vocal systems, however, provided mixed results in their adherence to this relationship, potentially due to conflicting evolutionary pressures related to differences in signaling range and communicational needs. To examine this potential parallel between human and animal vocal communication, and also to explore how divergent, sex-specific, communicational settings affect signaling efficiency within a species, we examined the complete vocal repertoire of rock hyraxes (Procavia capensis). As male and female hyraxes differ in their sociality levels and male hyraxes vocal repertoire is dominated by sexual advertisement songs, we hypothesized that sex-specific vocal repertoires could be subjected to different signaling optimization pressures. Our results show that the sexes differ in repertoire size, call usage, and adherence to coding efficiency principles. Interestingly, the classic call length/call usage relationship is not consistently found in rock hyraxes. Rather, a negative relationship between call amplitude and call usage is found, suggesting that the efficiency of the vocal repertoire is driven by call amplitude rather than duration. We hypothesize that, in contrast to human speech that is mainly intended for short distance, the need for frequent long-range signaling shapes an animal's vocal repertoire efficiency according to the cost of call amplitude rather than call length. However, call duration may be a secondary factor affecting signaling efficiency, in cases where amplitude is under specific selection pressures, such as sexual selection.


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