The effect of sublethal doses of dieldrin, parathion, and sevin on the calling song of Acheta domesticus L. (Orthoptera: Gryllidae) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pk02cd90p

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  • The objectives of this study were: a) to obtain and evaluate equipment for bio-acoustical analysis for this work and for future work in the analysis of insect sounds, b) to study the acoustical and sexual behavior of Acheta domesticus L., and c) to determine methods for analyzing the changes effected by Dieldrin, Parathion, and Sevin. Various instruments were evaluated for use as analytic equipment. An Ampex PR-10 tape recorder, a dynamic F-91 Sony microphone, a Tektronix 547 oscilloscope with a dual beam type lAl Plug-in Unit, and a Fairchild 751-A oscilloscope camera were among the equipment evaluated and found to be satisfactory. The acoustical and sexual behavior of A. domesticus were investigated and found to be closely correlated. A. domesticus has a song repertoire consisting of calling, pre-courtship, courtship, and aggressive sounds. In addition, there is a "threat" sound produced by a male courting an unresponsive female. This sound may be the same as the aggressive sounds produced when a courting male is interrupted by another male. The spermatophore is produced prior to or during the eliciting of the calling song. If the male succeeds in attracting a responsive female, a complex set of behavior patterns ensue, in which the male maneuvers the female into position for attachment of the spermatophore. During this time the male may elicit either the pre-courtship or courtship songs. Once the spermatophore has been accepted by the female, the male displays a watching behavior to prevent detachment of the spermatophore before it has emptied. Noticeable changes in the acoustical and sexual behavior occur when male crickets are treated with pesticides. Treatment with sublethal doses of Dieldrin and Sevin result in an increase in pulse rate, chirp rate, the number of pulses per chirp, and the frequency range in the calling song. Treatment of crickets with Parathion has the effect of disrupting the rhythm pattern of the calling and courtship songs, and increasing the range of frequencies elicited in the chirps of the calling songs. In addition, Parathion has the effect of inhibiting certain phases of the copulatory behavior. There appears to be a conflict of copulatory and post-copulatory behavior patterns.
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