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Ecology of Columbian black-tailed deer fawns in western Oregon

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dc.contributor.advisor Schmitz, Richard A.
dc.creator Pamplin, Nathan P.
dc.date.accessioned 2010-05-04T19:53:59Z
dc.date.available 2010-05-04T19:53:59Z
dc.date.copyright 2003-04-08
dc.date.issued 2003-04-08
dc.identifier.uri http://hdl.handle.net/1957/15730
dc.description Graduation date: 2003 en
dc.description.abstract Little is known about Columbian black-tailed deer (Odocoileus hemionus columbianus) because of their elusive nature and the logistical difficulty of studying them in densely forested and mountainous terrain. The Oregon Department of Fish and Wildlife has identified fawn survival as an important gap in the current knowledge of demography and their understanding of an apparent population decline. We used vaginal-implant transmitters to locate birth sites and capture newborn Columbian black-tailed deer fawns in the Umpqua National Forest in western Oregon. We used modified Clover traps to capture deer during the winter and early spring of 2000 and 2001. Vaginal-implant transmitters were inserted into 36 adult does in 2000 and 32 adult does in 2001. We identified a total of 42 birth sites within our study area using this technique and we captured 23 fawns which we monitored daily throughout the summer. We modeled birth site selection by examining both site-specific variables and characteristics that describe habitat structure across a nested, hierarchical range of four circular areas. We used logistic regression to compare 42 birth sites with 80 random sites. The model that explained the most variation included the amount of edge and the average slope within 1,000 m of the birth site. We radiocollared 23 fawns from 2000 and 2001; 19 were captured at the birth site, which was identified using the vaginal-implant transmitter, and 4 were captured opportunistically. Fawns were located at least every other day and we assessed habitat selection using selection ratios. Fawns used open and shelterwood patches more than their availability in the study area. Timber habitats were used most by fawns, but were used less than available. Survival was monitored daily from the fawns estimated date of birth to 76 days. The Kaplan-Meier survival estimate for 76 days was 44% (95% confidence interval=23-66%). We fitted our survival data to the Weibull distribution and took an information-theoretic approach to construct a priori models using fawn capture morphometrics and habitat variables within a 600 m and 1,000 m radius of the capture site. The model that best explained fawn survival time was the amount of roads within a 1,000 m radius of the capture site. A higher road density within fawn summer range increases fawn survival time by likely minimizing predator density due to vehicular disturbance. en
dc.language.iso en_US en
dc.relation Explorer Site::Wildlife Explorer en
dc.subject.lcsh Mule deer -- Ecology -- Oregon -- Umpqua National Forest en
dc.subject.lcsh Mule deer -- Infancy -- Oregon -- Umpqua National Forest en
dc.subject.lcsh Mule deer -- Oregon -- Umpqua National Forest -- Mortality en
dc.title Ecology of Columbian black-tailed deer fawns in western Oregon en
dc.type Thesis/Dissertation en
dc.degree.name Master of Science (M.S.) in Wildlife Science en
dc.degree.level Master's en
dc.degree.discipline Agricultural Sciences en
dc.degree.grantor Oregon State University en
dc.contributor.committeemember Edge, Dan
dc.contributor.committeemember Ramsey, Fred
dc.contributor.committeemember Matzke, Gordon
dc.description.digitization PDF derivative scanned at 300 ppi (256 B&W, 256 Grayscale, 24-bit Color), using Capture Perfect 3.0.82, on a Canon DR-9080C. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en

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