O. S. Korsunovskaya


Males of bush-cricket Isophya gracilis Mir. produce calling song (CS) consisting of two syllables (pulses) of 46–70 ms (mean 59 ms, SD = 13.7) and 128 ms (SD = 10.6) respectively. Pauses between them last 138–209 ms (mean 160 ms, SD = 32) (Stavropol population, record- ing at 26°C). Females respond to male call by short clicks after the end of the second syllabe. In behavioral experiments the female phonotaxis and sound reply were studied when duration of diverse components of the calling song were changed. It was shown that the single long pulse of double duration of the second pulse of CS or model of CS where the second pulse is twice the duration of corresponding unit in CS do not elicit phonotaxis. Other models of male song elicit positive phonotaxis but its duration exceeds that which occurs during stimulation by natural calling song. Stimuli containing only one first pulse or two pulses the first of them is as the first pulse of CS and the second one is shorter than the first in CS are no or low effective to elicit the sound reply of females. It is assumed that the recognition of the CS in the central nervous system of I. gracilis females is based on temporal and/or spatial summation of excitation and activity of inhibitory units. The last ones are activated by pulses which duration exceeds cor- responding parameter of CS. These elements can operate with temporal delay or as off-elements and so suppress female reaction.


Orthoptera, bush-crickets, Isophya gracilis, sound signals, acoustic behavior, recognition


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