@article{NagelKirschbaumEngelmannetal.2018,
  author    = {Nagel, Rebecca and Kirschbaum, Frank and Engelmann, Jacob and Hofmann, Volker and Pawelzik, Felix and Tiedemann, Ralph},
  title     = {Male-mediated species recognition among African weakly electric fishes},
  series = {Royal Society Open Science},
  volume    = {5},
  journal   = {Royal Society Open Science},
  number    = {2},
  publisher = {Royal Society},
  address   = {London},
  issn      = {2054-5703},
  doi       = {10.1098/rsos.170443},
  pages     = {8},
  year      = {2018},
  abstract  = {Effective communication among sympatric species is often instrumental for behavioural isolation, where the failure to successfully discriminate between potential mates could lead to less fit hybrid offspring. Discrimination between con- and heterospecifics tends to occur more often in the sex that invests more in offspring production, i.e. females, but males may also mediate reproductive isolation. In this study, we show that among two Campylomormyrus Africanweakly electric fish species, males preferentially associate with conspecific females during choice tests using live fish as stimuli, i.e. when all sensory modalities potentially used for communication were present. We then conducted playback experiments to determine whether the species-specific electric organ discharge (EOD) used for electrocommunication serves as the cue for this conspecific association preference. Interestingly, only C. compressirostris males associated significantly more with the conspecific EOD waveform when playback stimuli were provided, while no such association preference was observed in C. tamandua males. Given our results, the EOD appears to serve, in part, as a male-mediated pre-zygotic isolation mechanism among sympatric species. However, the failure of C. tamandua males to discriminate between con- and heterospecific playback discharges suggests that multiple modalities may be necessary for species recognition in some African weakly electric fish species.},
  language  = {en}
}
@misc{NagelKirschbaumEngelmannetal.2018,
  author    = {Nagel, Rebecca and Kirschbaum, Frank and Engelmann, Jacob and Hofmann, Volker and Pawelzik, Felix and Tiedemann, Ralph},
  title     = {Male-mediated species recognition among African weakly electric fishes},
  series = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Mathematisch-Naturwissenschaftliche Reihe},
  number    = {645},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-42501},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-425016},
  pages     = {8},
  year      = {2018},
  abstract  = {Effective communication among sympatric species is often instrumental for behavioural isolation, where the failure to successfully discriminate between potential mates could lead to less fit hybrid offspring. Discrimination between con- and heterospecifics tends to occur more often in the sex that invests more in offspring production, i.e. females, but males may also mediate reproductive isolation. In this study, we show that among two Campylomormyrus Africanweakly electric fish species, males preferentially associate with conspecific females during choice tests using live fish as stimuli, i.e. when all sensory modalities potentially used for communication were present. We then conducted playback experiments to determine whether the species-specific electric organ discharge (EOD) used for electrocommunication serves as the cue for this conspecific association preference. Interestingly, only C. compressirostris males associated significantly more with the conspecific EOD waveform when playback stimuli were provided, while no such association preference was observed in C. tamandua males. Given our results, the EOD appears to serve, in part, as a male-mediated pre-zygotic isolation mechanism among sympatric species. However, the failure of C. tamandua males to discriminate between con- and heterospecific playback discharges suggests that multiple modalities may be necessary for species recognition in some African weakly electric fish species.},
  language  = {en}
}
@article{PaulMamonekeneVateretal.2015,
  author    = {Paul, Christiane and Mamonekene, Victor and Vater, Marianne and Feulner, Philine G. D. and Engelmann, Jacob and Tiedemann, Ralph and Kirschbaum, Frank},
  title     = {Comparative histology of the adult electric organ among four species of the genus Campylomormyrus (Teleostei: Mormyridae)},
  series = {Journal of comparative physiology : A, Neuroethology, sensory, neural, and behavioral physiology},
  volume    = {201},
  journal   = {Journal of comparative physiology : A, Neuroethology, sensory, neural, and behavioral physiology},
  number    = {4},
  publisher = {Springer},
  address   = {New York},
  issn      = {0340-7594},
  doi       = {10.1007/s00359-015-0995-6},
  pages     = {357 -- 374},
  year      = {2015},
  abstract  = {The electric organ (EO) of weakly electric mormyrids consists of flat, disk-shaped electrocytes with distinct anterior and posterior faces. There are multiple species-characteristic patterns in the geometry of the electrocytes and their innervation. To further correlate electric organ discharge (EOD) with EO anatomy, we examined four species of the mormyrid genus Campylomormyrus possessing clearly distinct EODs. In C. compressirostris, C. numenius, and C. tshokwe, all of which display biphasic EODs, the posterior face of the electrocytes forms evaginations merging to a stalk system receiving the innervation. In C. tamandua that emits a triphasic EOD, the small stalks of the electrocyte penetrate the electrocyte anteriorly before merging on the anterior side to receive the innervation. Additional differences in electrocyte anatomy among the former three species with the same EO geometry could be associated with further characteristics of their EODs. Furthermore, in C. numenius, ontogenetic changes in EO anatomy correlate with profound changes in the EOD. In the juvenile the anterior face of the electrocyte is smooth, whereas in the adult it exhibits pronounced surface foldings. This anatomical difference, together with disparities in the degree of stalk furcation, probably contributes to the about 12 times longer EOD in the adult.},
  language  = {en}
}