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dc.contributor.advisorSchul, Johanneseng
dc.contributor.authorKilmer, Mary K., 1983-eng
dc.date.issued2010eng
dc.date.submitted2010 Springeng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on June 14, 2010).eng
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.eng
dc.descriptionThesis advisor: Dr. Johannes Schul.eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionM.A. University of Missouri--Columbia 2010.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Biological science.eng
dc.description.abstractThe hearing system of the katydid genus Neoconocephalus has two functions: intraspecific communication and predator (bat) avoidance. Male calls and bat cries differ spectrally and temporally. Katydids must recognize and discriminate between signal types. We categorized bat avoidance behaviors and examined temporal and spectral recognition of bat cries behaviorally during tethered flight in several species of Neoconocephalus. Four bat avoidance behaviors were detected in Neoconocephalus katydids; steering, wingbeat interruption, dives and leg kicks. The first three behaviors were amplitude dependent, elicited by a single ultrasound pulse while the fourth was pulse-rate dependent. Steering and leg kicks were performed consistently in all species but wingstop (wingbeat interruption or dive) occurred significantly less often in N. robustus, N. bivocatus and N. exciliscanorus, all larger species. Single pulse experiments showed that katydids respond best to pulses with relatively short rise times and a minimum duration. Spectral experiments showed that both N. exciliscanorus and N. bivocatus were relatively insensitive to higher frequencies(>30 kHz) while N. robustus, N. retusus and N. ensiger were sensitive. Among these three species, spectral selectivity differed, with N. ensiger being very insensitive at 13kHz while N. retusus and N. robustus remained sensitive. We discuss how differences in body size, habitat and call type might account for the differences in bat avoidance.eng
dc.format.extentviii, 55 pageseng
dc.identifier.merlinb79329603eng
dc.identifier.oclc648269619eng
dc.identifier.otherKilmerM-050710-T3342eng
dc.identifier.urihttp://hdl.handle.net/10355/8105eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.source.originalSubmitted by University of Missouri--Columbia Graduate School.eng
dc.subject.lcshKatydids -- Effect of predation oneng
dc.subject.lcshKatydids -- Effect of sound oneng
dc.subject.lcshInsect soundseng
dc.subject.lcshBat soundseng
dc.subject.lcshBats -- Detectioneng
dc.titleBat avoidance in the katydid genus Neoconocephaluseng
dc.typeThesiseng
thesis.degree.disciplineBiological sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.A.eng


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