Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest.
Examining how increasing distance affects the information content of vocal signals is fundamental for determining the active space of a given species' vocal communication system. In the current study we played back male koala bellows in a Eucalyptus forest to determine the extent that individua...
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Public Library of Science (PLoS)
2012-01-01
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| Series: | PLoS ONE |
| Online Access: | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0045420&type=printable |
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| author | Benjamin D Charlton David Reby William A H Ellis Jacqui Brumm W Tecumseh Fitch |
| author_facet | Benjamin D Charlton David Reby William A H Ellis Jacqui Brumm W Tecumseh Fitch |
| author_sort | Benjamin D Charlton |
| collection | DOAJ |
| description | Examining how increasing distance affects the information content of vocal signals is fundamental for determining the active space of a given species' vocal communication system. In the current study we played back male koala bellows in a Eucalyptus forest to determine the extent that individual classification of male koala bellows becomes less accurate over distance, and also to quantify how individually distinctive acoustic features of bellows and size-related information degrade over distance. Our results show that the formant frequencies of bellows derived from Linear Predictive Coding can be used to classify calls to male koalas over distances of 1-50 m. Further analysis revealed that the upper formant frequencies and formant frequency spacing were the most stable acoustic features of male bellows as they propagated through the Eucalyptus canopy. Taken together these findings suggest that koalas could recognise known individuals at distances of up to 50 m and indicate that they should attend to variation in the upper formant frequencies and formant frequency spacing when assessing the identity of callers. Furthermore, since the formant frequency spacing is also a cue to male body size in this species and its variation over distance remained very low compared to documented inter-individual variation, we suggest that male koalas would still be reliably classified as small, medium or large by receivers at distances of up to 150 m. |
| format | Article |
| id | doaj-art-128069bcfd3c41179f459cb076ffe9b7 |
| institution | OA Journals |
| issn | 1932-6203 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj-art-128069bcfd3c41179f459cb076ffe9b72025-08-20T02:05:31ZengPublic Library of Science (PLoS)PLoS ONE1932-62032012-01-0179e4542010.1371/journal.pone.0045420Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest.Benjamin D CharltonDavid RebyWilliam A H EllisJacqui BrummW Tecumseh FitchExamining how increasing distance affects the information content of vocal signals is fundamental for determining the active space of a given species' vocal communication system. In the current study we played back male koala bellows in a Eucalyptus forest to determine the extent that individual classification of male koala bellows becomes less accurate over distance, and also to quantify how individually distinctive acoustic features of bellows and size-related information degrade over distance. Our results show that the formant frequencies of bellows derived from Linear Predictive Coding can be used to classify calls to male koalas over distances of 1-50 m. Further analysis revealed that the upper formant frequencies and formant frequency spacing were the most stable acoustic features of male bellows as they propagated through the Eucalyptus canopy. Taken together these findings suggest that koalas could recognise known individuals at distances of up to 50 m and indicate that they should attend to variation in the upper formant frequencies and formant frequency spacing when assessing the identity of callers. Furthermore, since the formant frequency spacing is also a cue to male body size in this species and its variation over distance remained very low compared to documented inter-individual variation, we suggest that male koalas would still be reliably classified as small, medium or large by receivers at distances of up to 150 m.https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0045420&type=printable |
| spellingShingle | Benjamin D Charlton David Reby William A H Ellis Jacqui Brumm W Tecumseh Fitch Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest. PLoS ONE |
| title | Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest. |
| title_full | Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest. |
| title_fullStr | Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest. |
| title_full_unstemmed | Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest. |
| title_short | Estimating the active space of male koala bellows: propagation of cues to size and identity in a Eucalyptus forest. |
| title_sort | estimating the active space of male koala bellows propagation of cues to size and identity in a eucalyptus forest |
| url | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0045420&type=printable |
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