% pubman genre = article
@article{item_2583028,
title = {{Chimpanzee quiet hoo variants differ according to context}},
author = {Crockford, Catherine and Gruber, T. and Zuberb{\"u}hler, K.},
language = {eng},
issn = {2054-5703},
doi = {10.1098/rsos.172066},
publisher = {Royal Society},
address = {London},
year = {2018},
abstract = {{In comparative studies of evolution of communication, the{\textless}br{\textgreater}function and use of animal quiet calls have typically been{\textless}br{\textgreater}understudied, despite that these signals are presumably under{\textless}br{\textgreater}selection like other vocalizations, such as alarm calls. Here,{\textless}br{\textgreater}we examine vocalization diversification of chimpanzee quiet{\textless}br{\textgreater}{\textquoteleft}hoos{\textquoteright} produced in three contexts{\textemdash}travel, rest and alert{\textemdash}{\textless}br{\textgreater}and potential pressures promoting diversification. Previous{\textless}br{\textgreater}playback and observational studies have suggested that the{\textless}br{\textgreater}overarching function of chimpanzee hoos is to stay in contact{\textless}br{\textgreater}with others, particularly bond partners. We conducted an{\textless}br{\textgreater}acoustic analysis of hoos using audio recordings from wild{\textless}br{\textgreater}chimpanzees ({\textless}br{\textgreater}Pan troglodytes schweinfurthii{\textless}br{\textgreater}) of Budongo Forest,{\textless}br{\textgreater}Uganda. We identified three acoustically distinguishable,{\textless}br{\textgreater}context-specific hoo variants. Each call variant requires specific{\textless}br{\textgreater}responses from receivers to avoid breaking up the social{\textless}br{\textgreater}unit. We propose that callers may achieve coordination by{\textless}br{\textgreater}using acoustically distinguishable calls, advertising their own{\textless}br{\textgreater}behavioural intentions. We conclude that natural selection{\textless}br{\textgreater}has acted towards acoustically diversifying an inconspicuous,{\textless}br{\textgreater}quiet vocalization, the chimpanzee hoo. This evolutionary{\textless}br{\textgreater}process may have been favoured by the fact that signallers{\textless}br{\textgreater}and recipients share the same goal, to maintain social cohesion,{\textless}br{\textgreater}particularly among those who regularly cooperate, suggesting{\textless}br{\textgreater}that call diversification has been favoured by the demands of{\textless}br{\textgreater}cooperative activities.}},
journal = {{Royal Society Open Science}},
volume = {5},
number = {5},
eid = {172066},
}