Responses of Torus Semicircularis Cells of the Coqui Treefrog to FM Sinusoids
The Puerto Rican treefrog, Eleutherodactylus coqui, is a nocturnal, arboreal amphibian which is found in high densities in the Caribbean National Forest. The advertisement call of the male is made up of a sequence of two notes repeated every 3 to 4s: a constant-frequency (CF) “Co-note” of 1.1kHz lasting about 100ms followed by a more intense frequency-modulated (FM) “Qui-note” sweeping upward from 1.8 to 2.1kHz in 170ms (Narins and Capranica, 1976; Narins and Hurley, 1982). Eleutherodactylus portoricensis and E.antillensis are sympatric treefrog species with calls which resemble that of E.coqui in structure, but which differ in their note frequencies, durations and repetition rates. Behavioral studies with E.coqui have shown that the Co-note is used during male-male territorial interactions, whereas the Qui-note is attractive to females (Narins and Capranica, 1976; 1978) and may play a role in the aggressive response given by a male on a nest or retreat site (D. Townsend, pers. comm.). The function of the individual call notes of the advertisement calls of E.portoricensis and E.antillensis is unknown, but preliminary evidence suggests that the call plays a different role in these closely related species (P.M. Narins et al., in prep.).
KeywordsFiring Pattern Tuning Curve Advertisement Call Leopard Frog Torus Semicircularis
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