Effects of social interaction on the electric organ discharge in a mormyrid fish, Gnathonemus petersii (Mormyridae, Teleostei).
2003
SUMMARY African weakly discharging electric fish (Mormyridae) use their
self-generated electric signals and electroreceptive abilities for orientation
and communication in the context of courtship and territorial interactions.
This paper documents socially mediated changes in the electric organ discharge
(EOD) of subadult Gnathonemus petersii under non-breeding
environmental conditions. Increases in EOD duration and changes in the
relative phase amplitudes occurred in dominant fish during same-sex
(male–male, female–female) and opposite-sex interactions. Similar
changes were also observed in fish that were restricted in their physical
interactions, suggesting that direct contact is not necessary to induce
dominance-typical EOD waveforms. The possible communicative functions of these
changes are discussed.
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