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Fig. 1. EOD modulations in A. devenanzii (A,C-E) and A.
leptorhynchus (B). (A) Scatter plot of the frequency modulation (FM, Hz)
and duration (s) of 1286 EOD modulations recorded from 11 male and eight
female A. devenanzii. Two types of EOD modulations could be
distinguished based on the degree of FM: chirps (squares) and gradual
frequency rises (GFRs, circles). Chirps and GFRs could have either single
frequency peaks (open symbols) or multiple frequency peaks (grey symbols).
Note that because so many chirps are plotted, many single-peaked chirps and
GFRs are obscured by overlying multi-peaked chirps and GFRs. (B) A comparable
plot for 7950 EOD modulations from A. leptorhynchus based on data
from Kolodziejski et al. (Kolodziejski et
al., 2005). A. leptorhynchus produces GFRs (circles) and
two types of chirps: high-frequency chirps (squares) and low-frequency chirps
(triangles). Note the absence of low-frequency chirps in
Adontosternarchus and the lack of multi-peaked modulations in A.
leptorhynchus. (C) Histogram of the duration of single-peaked chirps.
Although most single-peaked chirps lasted 0.02-0.08 s, there is a `tail' of
longer duration chirps. (D) Histogram of the duration of multi-peaked chirps
in A. devenanzii. (E) Examples of single- and multi-peaked chirps and
GFRs produced by A. devenanzii. The top trace in each example tracks
EOD frequency, and the bottom trace is the raw voltage record. Note the
different time and frequency scales for chirps and GFRs.
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