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A transition between polymorphic phenotypes was observed within a single male Sternarchogiton nattereri. This individual was initially toothless, but developed into a toothed phenotype characterized by a swollen distal upper jaw and distinctive external dentition. Changes in morphological features were accompanied by shifts in electrocommunication (chirping) behaviour.
In this study we examined electrocommunication behavior in Sternarchogiton nattereri (Apteronotidae), a weakly electric fish from South America. We focused on variation between females and males lacking external dentition and used playbacks of simulated conspecifics to elicit chirps (modulations of their electric organ discharge, EOD). Chirp responses were not affected by the frequency of the playback...
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