Kramer, B. (2013) Morphological and electrophysiological field observations on electric freshwater fish of the genus Mormyrops Muller 1843 (Teleostei: Mormyridae) from West and southern Africa. AFRICAN JOURNAL OF AQUATIC SCIENCE, 38. pp. 31-41. ISSN 1608-5914, 1727-9364
Full text not available from this repository. (Request a copy)Abstract
Different specimens of Mormyrops anguilloides (Linnaeus 1758) were reported to display electric organ discharge (EOD) pulses of either initially head-positive or initially negative polarity, a hypothetical sex difference that has not been substantiated to date. The morphology and EODs of M. anguilloides of both sexes and a sexually mature size from the Comoe and Bandama rivers, Cote d'Ivoire, and the Lower and Middle Zambezi, Mozambique, displayed initially positive EODs. The morphologically similar M. breviceps Steindachner 1895 of both sexes and a sexually mature size from the Bandama River displayed initially head-negative EODs of biphasic waveform and long duration (0.93-1.15 ms) in the very-low-frequency spectral range. Mormyrops anguilloides from the Comoe and Bandama rivers were differentiated in caudal peduncle depth and in EOD waveform, pulse duration and spectral energy content. The former samples displayed a biphasic, lower-frequency EOD pulse of up to 0.42 ms duration, the latter a tetraphasic, high-frequency EOD of up to 0.33 ms. It is suggested that reports of EODs of both polarities in M. anguilloides indicate the presence of an unrecognised species.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GNATHONEMUS-PETERSII MORMYRIDAE; MACROLEPIDOTUS SPECIES COMPLEX; MARCUSENIUS-MACROLEPIDOTUS; ORGAN DISCHARGES; EASTERN AFRICA; CUNENE RIVER; DIFFERENTIATION; GENETICS; RESURRECTION; RECOGNITION; allopatric speciation; amplitude spectra; communication signal; differentiation; electric organ discharges; polarity reversal; sex difference |
| 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: | 28 Apr 2020 11:36 |
| Last Modified: | 28 Apr 2020 11:36 |
| URI: | https://pred.uni-regensburg.de/id/eprint/17343 |
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