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The purpose of this study is to identify the intrinsic and extrinsic quality characteristics of West Coast albacore tuna (Thunnus alalunga). Albacore tuna were troll caught off the Oregon coast and transferred to the Oregon State University Seafood laboratory in Astoria, Oregon. Core samples were extracted from six designated body zones of 16 fish and analyzed for lipid, moisture, protein, ash, and fatty acid distribution. Proximate distribution was constant throughout the body zones. Protein and ash made up 25% of the composition, lipid and moisture made up the remaining 75%. The lipid content ranged from 3.9 ± 0.2 to 36.3 ± 1.1%, with a distribution of higher lipid towards the head and lower lipid towards the tail. Total omega-3 content averaged 40% of the identified fatty acids for each body zone, with omega-3 (g/100g tissue) ranging from 2.1 ± 0.5 to 3.5 ± 0.4. Furthermore, an inverse correlation (R²= -0.95) was found for lipid and moisture content, enabling a faster estimate of lipid content derived from moisture content. Onboard handling techniques for West Coast albacore tuna were evaluated using sensory and analytical methods. Chilling (immediately and after 3 h), spiking, and bleeding at the throat and gills were evaluated by a sensory panel for overall quality, color, smell, texture and flavor. 2-Thiobarbituric acid-reactive substances (TEARS) and pH were also compared. Rapid chilling significantly and positively influenced overall quality, color, texture, and flavor; and significantly reduced oxidative rancidity. Bleeding at the throat significantly and positively influenced all sensory attributes tested, but did not significantly influence TEARS or pH. Neither spiking nor bleeding at the gills significantly affected sensory attributes. / Graduation date: 2003

Graduation date: 1999

49 leaves ; 29 cm Typescript Thesis (M.S.)--University of Oregon, 1974 Includes bibliographical references (leaves 45-49) Unif. Title University of Oregon theses, Dept. of Biology, M.S., 1974

Typescript. Includes vita and abstract. Bibliography: Includes bibliographical references (leaves 91-99). Description: xi, 99 leaves : ill., maps ; 29 cm.

This study measured and evaluated the relation of coastal foredune morphology to stream beach outlets, and investigated the processes associated with the stream outlet. Intermediate-size streams were studied, and defined as those that flow across the beach most of the year but have no tidal influence. Fifty-four of these streams were found along the northern Oregon coast between the Columbia River and Yaquina Bay. Crescent Lake Outlet, Saltair Creek and Daley Lake Outlet were chosen as study streams for further investigation.

The purpose of this study was to provide a comprehensive and descriptive study of the Oregon Mentorship Program. The study examined literature on adult mentorship programs particularly related to education and educational administration, and gathered mentor and protege perceptions on the personal and professional usefulness of program activities and characteristics. The analysis of the data may provide guidance for future formal mentorship programs designed to prepare better beginning administrators in the field of education. Data were gathered utilizing a questionnaire. All participants in the program (77 mentors and 79 proteges) were surveyed with an instrument designed around the follow-up study model. Statistical analyses of the data were based upon 55 mentor and 57 protege respondents. Chi square, mean, t-test, and Kendall's coefficient of concordance were used to determine significant differences among mentors and proteges. Two qualitative methodologies of analysis, phenomenology and development of a category system for analysis which seeks convergence and divergence were also applied to the responses. Major findings of this study were grouped as perceptions, structure, logistics, participant relationships, and demographic. Mentors and proteges had few differences in the way they perceived the mentorship program. Mentors and proteges did not agree on the significance of same/different gender mentor/protege pairings. Age differential between mentors and proteges was also not found to be a significant factor. Structurally, proteges more than mentors felt that directives and guidelines were unsatisfactory. Proteges did not agree that satisfactory year-long goals were established. Logistically, proteges were more likely to come to mentors than mentors to proteges. No significant differences existed in any of the items concerning the participant relationship category: mentors and proteges responded in similar ways to each of the questions. The study recommended future actions to enhance the Oregon Mentorship Program and made recommendations for further research into formal mentorship programs.

Marsh paleoseismological studies were conducted in four bays (Necanicum, Nestucca, Siletz, and Yaquina) along the northern Oregon coast and compared with completed studies in two other bays (Netarts and Alsea). Coseismically buried peats were identified in all bays, based on 1) abrupt contacts, decreases in organic content, increases in sand content, increases in beach sand, and changes in diatom assemblages, all from the peat to the overlying sediments, 2) distinct sandy layers and key plant macrofossils, such as Triglochin, above the buried peat, and 3) widespread correlation of the buried peats within the bay. The stratigraphy and the ages and depths of the top six coseismically buried peats were compared between bays. The following similarities were noted: 1) All bays recorded five burial events in the top 2.6 meters within the last 2200 years. 2) Six burial events were recorded in six bays in the top 3.0 meters, except Alsea Bay (3.3 m), and all six events occurred within the last 2600 years except Yaquina (2780 years). 3) The depth to the top of each buried peat in the bays is consistent, falling within discrete ranges, except for the top two events at Yaquina. 4) Distinct sandy layers (tsunami-deposited) are present over the topmost buried peat in all bays except Yaquina and over the 4th in all bays except Yaquina and Nestucca. 5) Distinct tsunami-deposited sandy layers are absent over the third buried peat in Netarts, Nestucca, Siletz, Alsea, and possibly Yaquina, but present at Necanicum. The evidence strongly suggests synchroneity of coseismic events between the Necanicum River and Alsea Bay (a distance of 175 km), with the exception of the 2nd and 6th event. The 6th coseismic event would be synchronous between Alsea and Netarts, a distance of 105 km. The support for synchroneity of the 2nd event is weak. Synchroneity of coseismic burial events on the northern Oregon coast would argue for paleomagnitudes of at least 8.1 Mw, given a minimum rupture width of 50 km and a rupture length of 105 km. The paleomagnitudes were determined using the moment magnitude equation, Mw = 2/3 IOg10 Mo - 10.7 where Mo = shear modulus x rupture area x seismic slip. The seismic slip is estimated from a minimum recurrence interval of 300 years and a minimum convergence rate of 3.5 cm/yr.Marsh paleoseismological studies were conducted in four bays (Necanicum, Nestucca, Siletz, and Yaquina) along the northern Oregon coast and compared with completed studies in two other bays (Netarts and Alsea). Coseismically buried peats were identified in all bays, based on 1) abrupt contacts, decreases in organic content, increases in sand content, increases in beach sand, and changes in diatom assemblages, all from the peat to the overlying sediments, 2) distinct sandy layers and key plant macrofossils, such as Triglochin, above the buried peat, and 3) widespread correlation of the buried peats within the bay. The stratigraphy and the ages and depths of the top six coseismically buried peats were compared between bays. The following similarities were noted: 1) All bays recorded five burial events in the top 2.6 meters within the last 2200 years. 2) Six burial events were recorded in six bays in the top 3.0 meters, except Alsea Bay (3.3 m), and all six events occurred within the last 2600 years except Yaquina (2780 years). 3) The depth to the top of each buried peat in the bays is consistent, falling within discrete ranges, except for the top two events at Yaquina. 4) Distinct sandy layers (tsunami-deposited) are present over the topmost buried peat in all bays except Yaquina and over the 4th in all bays except Yaquina and Nestucca. 5) Distinct tsunami-deposited sandy layers are absent over the third buried peat in Netarts, Nestucca, Siletz, Alsea, and possibly Yaquina, but present at Necanicum. The evidence strongly suggests synchroneity of coseismic events between the Necanicum River and Alsea Bay (a distance of 175 km), with the exception of the 2nd and 6th event. The 6th coseismic event would be synchronous between Alsea and Netarts, a distance of 105 km. The support for synchroneity of the 2nd event is weak. Synchroneity of coseismic burial events on the northern Oregon coast would argue for paleomagnitudes of at least 8.1 Mw, given a minimum rupture width of 50 km and a rupture length of 105 km. The paleomagnitudes were determined using the moment magnitude equation, Mw = 2/3 IOg10 Mo - 10.7 where Mo = shear modulus x rupture area x seismic slip. The seismic slip is estimated from a minimum recurrence interval of 300 years and a minimum convergence rate of 3.5 cm/yr.

Urban containment programs may be evaluated in terms of a theory unifying contributions from the economic, geographic and political science disciplines. The unified theory shows that successful programs will segment the urban-rural land market, remove speculative use value of rural land, and result in the urban land market valuing greenbelt proximity as an amenity. A general model to test urban containment programs against the unified theory is developed and then modified for application to Salem, Oregon. Results are fourfold. First, a gap in the locus of urban and rural land values at the UGB indicates that segmentation of the urban-rural land market is associated with urban containment policies. Second, the simultaneous effect of imposing a UGB proximate to urban development and subjecting rural land to conservancy zoning is to remove the speculative value component of rural land and reveal Sinclair's (1967) underlying convex quadratic agricultural use land value gradient. This finding is important in two respects: (a) it confirms the possibility of Sinclair's gradient, which has not been supported empirically hitherto, and (b) it suggests that a program's success in preserving greenbelt land solely for agricultural uses can be evidenced if Sinclair's gradient is revealed. Third, the conditions under which a program may fail to preserve rural land from speculative behavior will be evidenced by the traditional negatively sloping land value gradient. Fourth, where urban development is proximate to a UGB delineating greenbelts, the urban land market will value its proximity as an amenity. This finding is important in two respects: (a) it suggests that proximity to privately owned greenbelts may be valued as an amenity in the urban land market, a finding which has not been reported empirically hitherto, and (b) if an urban land market has confidence in the ability of an urban containment program to prevent sprawl into greenbelts, then it will treat greenbelt proximity as an amenity. The unified theory and methodology developed by this dissertation are generalizable to the evaluation of other urban containment programs.

The "unusual" behavior of agricultural land prices is the subject of considerable debate and controversy and is the object of this research. There is little doubt that land prices have been increasing steadily since 1959 and dramatically throughout the decade of the 1970's. However, there is widespread disagreement among economists, appraisers, and other interested parties as to the causes of the dramatic increases in land prices. Net agricultural income is undoubtedly an important factor in the agricultural land market. Yet, land prices have continued to increase in the face of steady and even declining net incomes. Other factors often considered as exerting considerable influences are inflation, pressures from an increasing population, incentives to attain economies of size through ranch enlargement, and capitalization of government farm program "payments" into land values. The objective of this research is to identify the factors that exert significant influence on agricultural grazing land sale prices in two Eastern Oregon counties and to assess the impact of changes in these factors on the selling price of grazing land. A single equation linear regression model is used to identify the factors that have a significant impact on the price of grazing land. The variables determined to be positively correlated to the price of grazing land are the productivity of the land, the price of feeder cattle, inflation, and the assessed value of real property included in the land sales. The price of hay is negatively correlated with the price of grazing land. The inclusion of public land (USFS and BLM) grazing privileges in the sale was found to have no significant effect on the price of grazing land. In addition, purchases for the purpose of ranch enlargement are occurring at lower prices than purchases for ranch establishment. The major limitations of this study are the restrictions placed on the sales that are analyzed and the problem of standardizing a measure of land productivity. The first limitation is defensible given the stated objectives of the study and the need to limit the analysis to a roughly homogeneous class of land sales. The latter limitation prohibits generalization of the results to other areas without appropriate standardization of the measure of land productivity. / Graduation date: 1979