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dc.contributor.advisorSchul, Johannesen_US
dc.contributor.authorKilmer, Mary K., 1983-en_US
dc.date.issued2010eng
dc.date.submitted2010 Springen_US
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on June 14, 2010).en_US
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.en_US
dc.descriptionThesis advisor: Dr. Johannes Schul.en_US
dc.descriptionIncludes bibliographical references.en_US
dc.descriptionM.A. University of Missouri--Columbia 2010.en_US
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Biological science.en_US
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.en_US
dc.format.extentviii, 55 pagesen_US
dc.identifier.merlinb79329603
dc.identifier.oclc648269619en_US
dc.identifier.otherKilmerM-050710-T3342en_US
dc.identifier.urihttp://hdl.handle.net/10355/8105
dc.publisherUniversity of Missouri--Columbiaen_US
dc.relation.ispartof2010 Freely available theses (MU)en_US
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2010 Theses
dc.subject.lcshKatydids -- Effect of predation onen_US
dc.subject.lcshKatydids -- Effect of sound onen_US
dc.subject.lcshInsect soundsen_US
dc.subject.lcshBat soundsen_US
dc.subject.lcshBats -- Detectionen_US
dc.titleBat avoidance in the katydid genus Neoconocephalusen_US
dc.typeThesisen_US
thesis.degree.disciplineBiological scienceseng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMastersen_US
thesis.degree.nameM.A.en_US


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