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Electroreception in Gymnotus carapo: differences between self-generated and conspecific-generated signal carriers
P A Aguilera1, M E Castelló, A A Caputi
1Laboratorio de Neurofisiología Comparada, Departamento de Neuroanatomía Comparada, Unidad Asociada a Facultad de Ciencias, Instituto de Investigaciones Biológicas Clemente Estable, Av. Italia 3318, Montevideo, Uruguay.
The Journal of Experimental Biology
|January 4, 2001
Summary
Electric organ discharges in Gymnotus carapo create distinct local self-generated and conspecific-generated fields. Different electric organ regions generate signals used for electrolocation and electrocommunication in pulse-emitting gymnotids.
Area of Science:
- Neuroscience
- Bioelectricity
- Animal Communication
Background:
- Gymnotiform electric fish use electric organ discharges (EODs) for sensing and communication.
- Understanding the spatio-temporal characteristics of EODs is crucial for deciphering their functions.
Purpose of the Study:
- To investigate the local electric fields generated by Gymnotus carapo on its own skin and on a conspecific.
- To differentiate the field components responsible for electrolocation versus electrocommunication.
Main Methods:
- A specialized probe was used to measure local electric fields on the skin of emitter and receiver fish.
- Electric organ discharges were analyzed for their spatial patterns, time waveforms, and power spectral density.
- Lesion experiments on the electric organ were conducted to identify contributing regions to different field components.
Main Results:
- Self-generated fields at the head were strong, collimated, and site-independent with a slow negative-positive waveform.
- Con-specific generated fields showed spatio-temporal patterns dependent on fish orientation and had higher frequency components.
- Lesion studies indicated abdominal regions generate self-fields, while trunk/tail regions generate fields influencing conspecifics.
Conclusions:
- Electrolocation and electrocommunication signals in pulse-emitting gymnotids are likely carried by distinct field components.
- These distinct components originate from different regions of the electric organ.
- The findings provide insights into the dual roles of EODs in gymnotiform fish.