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Fig. 1. Examples of electric pulses produced by three morphs of the
magnostipes complex. (A) Time-domain EOD waveforms of multiple
individuals. All voltage traces are standardized to the same peak-to-peak
amplitude, plotted as overlays of waveforms recorded from N unique
individuals and aligned by their head-positive peaks (with head-positivity
up). Type III waveforms (all from a site near the village Na) were recorded in
previous studies (Sullivan et al.,
2004; Arnegard et al.,
2005). (B) Power spectra calculated for the same EODs. Red voltage
traces and power spectra correspond to DC recordings (bandwidth 0-50 kHz). All
other recordings in black were AC-coupled (bandwidth 0.1 Hz-50 kHz).
AC-coupling did not detectably alter type I and type II female-like EODs
relative to DC recordings. Some measurements of EOD power spectra (also
extremely similar between morphs) were previously provided for Ivindo River
type I and type II females and non-breeding males by Hopkins, who referred to
them as Hippopotamyrus batesii `reverse polarity' and H.
batesii `triphasic', respectively
(Hopkins, 1981). Note also
that Hopkins shows a breeding male EOD of the type I morph in the right column
of his fig. 2
(Hopkins, 1981).
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