EPIDEMIOLOGIC ANALYSIS OF RISK FACTORS FOR LOCAL DISAPPEARANCES OF NATIVE RANID FROGS IN ARIZONA

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dc.contributor.advisorKane, Andrew S.en_US
dc.contributor.authorWitte, Carmel Leeen_US
dc.contributor.departmentAnimal Sciencesen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2005-10-11T10:48:38Z
dc.date.available2005-10-11T10:48:38Z
dc.date.issued2005-08-11en_US
dc.description.abstractThis study used epidemiologic case-control methodology to examine habitat and environmental factors contributing to amphibian declines in Arizona. Risk factors were compared between sites where frogs disappeared (cases) and persisted (controls) using univariate and multivariable logistic regression analyses. Thirty-six percent (117/324) of all sites became cases during the study period. Elevation, non-native predators, hydrologic characteristics, aspect, and effects of nearby sites were significantly associated with frog persistence or disappearance. In the final multivariable model, risk for disappearance increased with increasing elevation (OR=2.7 for every 500 meters, P<0.01). Sites where disappearances occurred were 4.3 times more likely to have other nearby sites that also experienced disappearances (P<0.01), while having an extant population nearby decreased risk of disappearance by 85% (OR=0.15, P<0.01). Sites experiencing disappearances were 2.6 times more likely to have crayfish than control sites (P=0.04). Identification of risk factors associated with frog disappearances will guide future research and conservation efforts.en_US
dc.format.extent618998 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/2986
dc.language.isoen_US
dc.subject.pqcontrolledBiology, Generalen_US
dc.subject.pqcontrolledBiology, Veterinary Scienceen_US
dc.subject.pqcontrolledBiology, Ecologyen_US
dc.subject.pquncontrolledamphibianen_US
dc.subject.pquncontrolledfrogen_US
dc.subject.pquncontrolleddeclineen_US
dc.subject.pquncontrolledepidemiologyen_US
dc.subject.pquncontrolledrisk factorsen_US
dc.subject.pquncontrolledcase-controlen_US
dc.titleEPIDEMIOLOGIC ANALYSIS OF RISK FACTORS FOR LOCAL DISAPPEARANCES OF NATIVE RANID FROGS IN ARIZONAen_US
dc.typeThesisen_US

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