Abstract :
[en] We have used a lately established workflow to quantify
rhythms of three fish sound types recorded in different areas
of the Mediterranean Sea. So far, the temporal structure of
fish sound sequences has only been described qualitatively.
Here, we propose a standardized approach to quantify them,
opening the path for assessment and comparison of an often
underestimated but potentially critical aspect of fish sounds.
Our approach is based on the analysis of inter-onset-intervals
(IOIs), the intervals between the start of one sound element
and the next. We calculate exact beats of a sequence using
Fourier analysis and IOI analysis. Furthermore, we report on
important parameters describing the variability in timing
within a given sound sequence. Datasets were chosen to
depict different possible rhythmic properties: Sciaena umbra
sounds have a simple isochronous—metronome-like—
rhythm. The /Kwa/ sound type emitted by Scorpaena spp.
has a more complex rhythm, still presenting an underlying
isochronous pattern. Calls of Ophidion rochei males present
no rhythm, but a random temporal succession of sounds.
This approach holds great potential for shedding light on
important aspects of fish bioacoustics. Applications span
from the characterization of specific behaviours to the
potential discrimination of yet not distinguishable species
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