Abstract
A variety of bioacoustics distance metrics have been used to assess similarities in the vocalizations of different individuals. Here, we provide a detailed analysis of several acoustic similarity indices, some of which have been developed with the specific aim of characterizing the sensory coding of auditory stimuli. We compare different approaches through the analysis of begging calls of several passerine species and specialist brood parasitic cuckoos that putatively evolved to mimic their hosts. The different bioacoustics distances did not provide consistently correlated similarity patterns, implying that they are sensitive to different sound features. However, the encoded spectrogram alignment method was correlated with all other acoustic distance metrics, suggesting that this method provides a consistent approach to use when the perceptually salient sound parameters are unknown for a particular species. Our analyses confirm that statistical similarity of begging calls can be detected in a New Zealand pair of host and specialist parasite species. We also show detectable similarity in two other Australasian host–parasite pairs and another New Zealand system, but to a more limited extent. By examining phylogenetic patterns in the begging call diversity, we also confirm that specialist cuckoos have evolved to mimic the begging calls of their hosts but host species have not co-evolved to modify their calls in response to begging call similarity by the parasite. Our results illustrate that understanding the function and mechanism of behavioral copying and mimicry requires statistically consistent measures of similarity that are related to both the physical aspects of the particular display and the sensory basis of its perception.
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Acknowledgements
We thank Phillip Cassey, Brian Gill, Tomas Grim, Rebecca Kilner, Todd Landers, Naomi Langmore, Arnon Lotem, Luis Ortiz Catedral, Kevin Parker, and Allen Rodrigo for discussions and comments. Fieldwork was conducted with permission from the Auckland Regional Council, Department of Conservation, and the Massey University Animal Ethics Committee. We are grateful for field assistance by many helpers, too numerous to mention here (see http://www.massey.ac.nz/dhbrunto/ppl/MichaelAnderson.htm). Funding was provided from a Bright Futures Top Achiever Scholarship, Massey University (M.G.A.), the National Geographic Society and the Human Frontier Science Program (to M.E.H.), and two New Zealand Marsden Fund Grants (M.E.H.; D.H.B. and H.A.R.).
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Louis Ranjard, Michael G. Anderson contributed equally to the research
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Online Resource 1
Rank order of the similarity to the begging calls of the parasitic shining cuckoo in New Zealand and its grey warbler host, for each acoustic distance measure. The parasite and its host are highlighted and the species of the genus Chalcites are marked (†, dagger). The names of the shining cuckoo hosts are in brackets and abbreviated for g.w., grey warbler; w.t., western thornbill; and y.r.t., yellow-rumped thornbill. (DOC 50 kb)
Online Resource 2
Rank order of the similarity to the begging calls of the parasitic shining cuckoo in Western Australia and its western thornbill host, for each acoustic distance measure. The parasite and its host are highlighted and the species of the genus Chalcites are marked (†, dagger). The names of the shining cuckoo hosts are in brackets and abbreviated for g.w., grey warbler; w.t., western thornbill; and y.r.t., yellow-rumped thornbill. (DOC 52 kb)
Online Resource 3
Rank order of the similarity to the begging calls of the parasitic Horsfield's bronze-cuckoo in Western Australia and its western thornbill host, for each acoustic distance measure. The parasite and its host are highlighted and the species of the genus Chalcites are marked (†, dagger). The names of the shining cuckoo hosts are in brackets and abbreviated for g.w., grey warbler; w.t., western thornbill; and y.r.t., yellow-rumped thornbill. (DOC 51 kb)
Online Resource 4
Rank order of the similarity to the begging calls of the parasitic long-tailed cuckoo in New Zealand and its yellowhead, whitehead, and brown creeper hosts, for each acoustic distance measure. The parasite and its host are highlighted and the species of the genus Chalcites are marked (†, dagger). The names of the shining cuckoo hosts are in brackets and abbreviated for g.w., grey warbler; w.t., western thornbill; and y.r.t., yellow-rumped thornbill. (DOC 54 kb)
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Ranjard, L., Anderson, M.G., Rayner, M.J. et al. Bioacoustic distances between the begging calls of brood parasites and their host species: a comparison of metrics and techniques. Behav Ecol Sociobiol 64, 1915–1926 (2010). https://doi.org/10.1007/s00265-010-1065-2
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DOI: https://doi.org/10.1007/s00265-010-1065-2