Kramer, Leo Bernd (2019) Harmonic and temporal structure of electric organ discharges of the wave-type in Amazonian knifefishes (Gymnotiformes). JOURNAL OF ETHOLOGY, 37 (1). pp. 1-11. ISSN 0289-0771, 1439-5444
Full text not available from this repository. (Request a copy)Abstract
Neotropical, nocturnal freshwater knifefishes of the families Sternopygidae and Apteronotidae are electroreceptive, and emit electric organ discharges (EODs) of the wave type for communication and active electrolocation. In a field-collected sample of an estimated 43 gymnotiform species, members of the former family displayed the same type of sinusoidal EOD waveform at frequencies of up to about 800Hz, with the fundamental frequency, f1, the strongest harmonic in each. Members of the latter (Apteronotidae) displayed f1 frequencies of up to 1800Hz, and a great diversity in EOD waveform. Apteronotid EODs often differed from those of sternopygids by more harmonics at stronger amplitudes, where f1 was not always the strongest harmonic. The frequency band at -10dB increased with diminishing f1 amplitude. In contrast to apteronotids, all sternopygids showed the same phase relationship between their respective f1 and f2: a difference of an average 72 degrees, which explains their single type of sinusoidal waveform. In apteronotids a great variety of phase relationships among harmonics was observed, in some their harmonics series cycled through 360 degrees repeatedly. It is argued that the evolutionary driving force for the apteronotids in contrast to sternopygids was the greater potential for adaptive radiation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | JAMMING AVOIDANCE-RESPONSE; PHASE SENSITIVITY; FISH EIGENMANNIA; FORM DISCRIMINATION; STERNOPYGIDAE; COMMUNICATION; TELEOSTEI; FREQUENCY; GENUS; PRECEDES; Signal waveform; Amplitude spectrum; Phase spectrum; Sternopygidae; Apteronotidae; Total harmonic distortion; Evolutionary driving force; Carrier frequency |
| Subjects: | 500 Science > 570 Life sciences 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie Biology, Preclinical Medicine > Institut für Zoologie > Alumni or Retired > Verhaltensbiologie und Verhaltensphysiologie (Prof. Dr. Bernd Kramer) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Apr 2020 06:17 |
| Last Modified: | 22 Apr 2020 06:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/27878 |
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