Baier, Bernd (2008) Effect of conductivity changes on the stability of electric signal waveforms in dwarf stonebashers (Mormyridae; Pollimyrus castelnaui, P. marianne). Journal of comparative physiology. A, Neuroethology, sensory, neural, and behavioral physiology 194 (10), pp. 915-919.
The dwarf stonebasher sibling species Pollimyrus castelnaui and P. marianne use differences in the electric organ discharges (EODs) for species recognition. As EOD waveforms are affected by water conductivity changes, the reliability of species recognition might be impeded due to natural variability in the environment. EODs of P. castelnaui (N = 8) and P. marianne (N = 8) under high (250 µS/cm) and low (25 µS/cm) conductivity were recorded and compared. Local peaks of the EODs of both species were significantly and predictably modified due to the conductivity change but species-specific differences were always recognizable. The duration of the EODs was not influenced by the conductivity change. Temperature alterations modified the duration in a linear relationship, allowing the determination of Q10 values (1.6 for P. castelnaui's and 1.7 for P. marianne's EODs). As the species-specific differences are not masked by conductivity effects, EOD discrimination seems to be a reliable species recognition mechanism under natural circumstances.
|Institutions:||Biology, Preclinical Medicine > Institut für Zoologie|
|Keywords:||electric organ discharge; water conductivity; Q10 value; species recognition; weakly electric fish|
|Subjects:||500 Science > 570 Life sciences|
500 Science > 590 Zoological sciences
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Owner:||Helge Knüttel (ADMIN)|
|Deposited On:||16 Sep 2008 14:16|
|Last Modified:||20 Jul 2011 21:21|