Evolution of acoustic signals in Cyprinella: degree of similarity in sister species
Signal structure and behavioural context were examined in two sister species, the Tallapoosa shiner Cyprinella gibbsi and the tricolor shiner Cyprinella trichroistia, with two more distantly related species, the Ocmulgee shiner Cyprinella callisema and the whitetail shiner Cyprinella galactura, in order to test the hypothesis that more closely related species would share components of signals not shared with more distant relatives, and to look at the degree of divergence. The species examined differed in number and type of signal components, contexts and frequency under which calls were produced. While all species produced pulses arranged into pulse bursts, C. gibbsi and C. trichroistia shared unique call types, chirps and rattles, and C. galactura and C. callisema both produced the knock call type. The sister species shared more components of their call repertoire with each other than with the more distantly related C. galactura and C. callisema and clustered together based on courtship call similarity.
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