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. 2014 Aug 22;281(1789):20141047. doi: 10.1098/rspb.2014.1047

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© 2014 The Author(s) Published by the Royal Society. All rights reserved.

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Figure 4. — (a) Example of pulsed sounds in Amphiprion akallopisos (modified from [47]). This oscillogram illustrates two main sonic variables: the pulse duration and the pulse period. (b) Standard deviation of the pulse period in sounds produced by 13 species of damselfishes. The two Chromis species, which do not possess the ceratomandibular (cmd) ligament (grey histograms), show highly variable pulse periods during sound emissions in comparison with the species with the cmd ligament (white histograms). The figures between brackets give the number of fish studied and the number of sounds analysed, respectively.