Index Catalog // ScholarsArchive@OSU

Epizootiology of leptospirosis in some wild mammals in western Oregon

Creator:: Stewart, Thomas Walter
Abstract:: Two hundred thirteen mammals were captured on two study areas between April 1976 and August 1977. Samples of urine and kidney tissue from 202 mammals were cultured on media suitable for leptospiral growth. Leptospiral organisms were not isolated from tissue cultures. Sera from 88 mammals were examined by the microscopic...
Resource Type:: Masters Thesis
Full Text:: western Oregon AN ABSTRACT OF THE THESIS OF Thomas Walter Stewart for the degree of Master of Science

Population characteristics and habitat utilization of bighorn sheep, Steens Mountain, Oregon

Creator:: Van Dyke, Walter A.
Abstract:: A herd of re-introduced California bighorn sheep (Ovis canadensis californiana) was studied from 15 June 1976 to 31 August 1977. Thirteen major and seven minor habitats were delineated and described. Habitat use by bighorns was observed throughout the study and a habitat preference value (H.P.V.) was calculated based on use...
Resource Type:: Masters Thesis
Full Text:: 2 3 4 1 1 a " n " i n d i c a t e s t h e n u m b e r o f tran s e c t s u s e d i n t h e

Variation in the maturity schedule of English sole and its influence on calculating the F₃₅ ̳% target fishing rate

Creator:: Al-Jufaily, Saud M.
Resource Type:: Masters Thesis
Full Text:: . Test for F P LENG.HAUL+HAUL 142.51 193 Bottom type (B) Separate L50s 286.02 239 L50s 4.225 9.79E-13

Population demography, resource use, and movement in cooperatively breeding Micronesian Kingfishers

Creator:: Kesler, Dylan C.
Abstract:: Island systems and species are susceptible to extinction because of their small population size and an ecological naiveté from an evolutionary past lacking strong competition and predation. For example, only one-fifth of the world’s bird species occur on islands, yet more than 90% of the avian extinctions witnessed during historic...
Resource Type:: Dissertation
Full Text:: Walters provided valuable guidance. Dr. Selina Heppell and Manuela Huso of Oregon State University and

Patterns of loggerhead turtle ontogenetic shifts revealed through isotopic analysis of annual skeletal growth increments

Creator:: Ramirez, Matthew D., Avens, Larisa, Seminoff, Jeffrey A., Goshe, Lisa R., and Heppell, Selina S.
Abstract:: Ontogenetic changes in resource use often delimit transitions between life stages. Ecological and individual factors can cause variation in the timing and consistency of these transitions, ultimately affecting community and population dynamics through changes in growth and survival. Therefore, it is important to document and understand behavioral and life history...
Resource Type:: Article
Full Text:: ) Discrete ontogenetic shift: single year, one-way transition from oceanic to neritic lifestyle; (B) faculta

Proposed minimum mesh size for managing the common Chilean hake fishery

Creator:: Pavez Carrera, Patricio B.
Abstract:: An analysis was conducted to estimate the minimum mesh size for managing the common Chilean hake (Merluccius gayi) fishery. Secondary objectives were to establish the selective relationship between mesh size and fish length, to examine growth patterns and related parameters, and to estimate the critical age (or optimum size) at...
Resource Type:: Masters Thesis
Full Text:: COMMON CHILEAN HAKE FISHERY. Abstract approved: Redacted for Privacy HOWARD F. go-RTON An analysis

Evaluating the data-poor fishery stock assessment method, DB-SRA

Creator:: Owashi, Brandon R.
Abstract:: Depletion-Based Stock Reduction Analysis (DB-SRA; Dick and MacCall, 2011) is a catch-only fisheries stock assessment model that has been developed to estimate an overfishing limit (OFL) in data-poor situations. DB-SRA projects the biomass trajectories of a stock by means of a catch time series and five parameters: the instantaneous, per...
Resource Type:: Masters Thesis
Full Text:: : _______________________________________________________________________________ David B. Sampson Depletion-Based Stock Reduction Analysis (DB-SRA; Dick and MacCall, 2011

Linking Moral Obligations, Assumption-based Research, and Structured Decision Making to Inform Bull Trout Recovery

Creator:: Brignon, William R.
Abstract:: More than 1500 species of plants and animals in the United States are listed as threatened or endangered under the Endangered Species Act (ESA). The U.S. Departments of Interior and Commerce are required, under Section 4(f)(1) of the ESA, to develop recovery plans for ESA-listed species under the respective agency...
Resource Type:: Dissertation
Full Text:: recipient adult abundance (a,c,e) and response profiles of the identity of the optimal decision (b,d,f) at

Statistical model selection criteria and their application to the Stock Synthesis assessment program

Creator:: Helu, Siosaia Langitoto
Abstract:: Statistical modeling has evolved around building increasingly more complex models, even though it is common knowledge among statisticians that an optimal model size usually exists for any given data set. Having overly complex models leads to imprecise parameter estimates and tends to increase the subjective role of the modeler, which...
Resource Type:: Masters Thesis
Full Text:: variable and s(b,) is the standard deviation of br. It can be shown that 16 b2 F* (t*)2 (2.14

Development of a progeny marker for steelhead

Creator:: Shippentower, Gene E.
Abstract:: This study was undertaken to determine if strontium chloride could be used to create a trans-generational otolith mark in steelhead (Oncorhynchus mykiss). I completed two strontium injection trials and a survey of juvenile steelhead from various steelhead hatcheries. The two trials measured Sr:Ca ratios in otoliths in response to injections...
Resource Type:: Masters Thesis
Full Text:: ) control B) 1000 ppm strontium, and C) 5000 ppm strontium. Length values are grouped into 5 mm intervals

ScholarsArchive@OSU

Epizootiology of leptospirosis in some wild mammals in western Oregon

Population characteristics and habitat utilization of bighorn sheep, Steens Mountain, Oregon

Variation in the maturity schedule of English sole and its influence on calculating the F₃₅ ̳% target fishing rate

Population demography, resource use, and movement in cooperatively breeding Micronesian Kingfishers

Patterns of loggerhead turtle ontogenetic shifts revealed through isotopic analysis of annual skeletal growth increments

Proposed minimum mesh size for managing the common Chilean hake fishery

Evaluating the data-poor fishery stock assessment method, DB-SRA

Linking Moral Obligations, Assumption-based Research, and Structured Decision Making to Inform Bull Trout Recovery

Statistical model selection criteria and their application to the Stock Synthesis assessment program

Development of a progeny marker for steelhead

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