Policy decisions in fishery management are becoming increasingly complex and difficult. This is especially true for the salmon fisheries where policy outcomes affect the productivity of the salmon resource and the subsequent well-being of commercial fishermen, charter boat operators, Indian fishermen, and sport anglers. The objective of this study was to advance methodology from statistical decision analysis which would assist fishery managers in Oregon who must make particularly difficult choices with respect to allocation and production of coho salmon while recognizing uncertainties in the environment, incomplete state of knowledge, and the conflicting needs and desires of different interest groups. The method chosen given multiple objectives and uncertainty is multiattribute utility analysis. The approach consists, of two main components: (1) a computer model which simulates the life cycle of hatchery and stream spawning coho salmon given environmental variation, different hatchery juvenile release levels and harvest rates; and (2) an objective function which relates the different outcomes from alternative release levels and harvest rates to an assessment of the degree to which individual objectives are met. The approach was used to evaluate and rank the expected outcomes from twelve proposed policies under different hypothesized ocean environments. Analysis of the results suggest that (1) the most effective policy is achieved with a relatively low harvest rate and high smolt release level; (2) selection of a particular harvest rate is the most important decision variable; and (3) a large smolt release level can be maintained unless such releases adversely decreases the ocean survival of stream spawning coho. Because the coho fishery is a mixed stock fishery consisting of hatchery and wild stocks, the results suggest that too high a harvest rate will lead to depletion of wild stocks, considered important because of their potential contribution to production and diverse genetic traits and characteristics. Conversely, too low a harvest rate will lead to excessive escapement of coho and thus reduce the total catch. As is illustrated, formulating the coho decision problem in a multiattribute utility analysis framework is useful in two ways. First, by quantifying the objectives of the decision maker, consistent results from following alternative policies can be determined. These results provide a basis for comparison and serve as a guide for decision making involving uncertainty. Second, the approach is useful in isolating major objectives and conflicts, value judgments, trade-offs, and needed empirical evidence. / Graduation date: 1982

In the Pacific Northwest ecoregion of North America, sculpins represent a major constituent of freshwater assemblages in coastal rivers. Based on their prevalence and abundance, sculpins are likely important ecologically, yet little is known of their interactions with co-occurring species, such as widely studied salmon and trout (salmonines). In this study, I evaluated inter- and intraspecific interactions involving cottids (Cottus sp.) and coastal cutthroat trout (Oncorhynchus clarkii clarkii). I used a response surface experimental design to independently evaluate effects of cutthroat trout and sculpin biomass on growth and behavior. There was evidence of both intra- and interspecific interactions between cutthroat trout and sculpins, but the interactions were asymmetrical with biomass of cutthroat trout driving both intra- and interspecific interactions, whereas sculpins had little influence overall. Cutthroat trout biomass was positively related to conspecific aggressive interactions and negatively related to growth. Sculpin exhibited increased use of cover during the day in response to greater biomass of cutthroat trout, but not sculpin biomass. Nocturnal use of cover by sculpins was unaffected by biomass of either species. This experiment provides insights into the species interactions and the mechanisms that may allow sculpins and salmonines to coexist in nature. As cutthroat trout appear to be superior competitors, coexistence between sculpins and cutthroat trout may depend on some form of refuge, either in the form of in-stream cover or crypsis coupled with diel resource segregation. Cutthroat trout are usually active during the day, indicating that nocturnal foraging by sculpins may in part represent a behavior that minimizes interspecific competition with cutthroat trout. / Graduation date: 2012

Sediment deposit ages inferred from radiocarbon dating of stream bank material were used to estimate residence times of valley-floor deposits in headwater valleys of the Oregon Coast Range, USA. Inherited ages of radiocarbon-dated material, i.e., time between carbon fixation in wood and its incorporation in a sediment deposit, can result in over-estimation of the ages of those deposits and, hence, the residence times of sediment within those units. Calibrated radiocarbon dates of 126 charcoal pieces sampled from Knowles Creek were used to estimate the distribution of inherited ages in fourteen depositional units representing three deposit types: fluvial fines, fluvial gravels, and debris flows. Within a depositional unit, the inherited age distribution of a piece of charcoal was estimated by convolving its calibrated age distribution with that of the piece of charcoal with the smallest weighted-mean calibrated age (i.e., an approximation of a unit's date of deposition) within that unit. All inherited age distributions for a particular deposit type were then added and normalized to provide a probability distribution of inherited ages for that deposit type. Probability distributions of inherited ages average 688, 1506, and 666 yr for fluvial fines, fluvial gravels, and debris flow units, respectively. Curves were fit to inherited age distributions for each deposit type. These curve fits were then convolved with deposit age distributions (i.e., equal to calibrated age distributions of woody material sampled from stream banks) of samples from Bear Creek (Lancaster and Casebeer, 2007) to correct these deposit ages for inherited age. This convolution gives a corrected deposit age. In cases in which means of corrected deposit age distributions for an upper unit were older than those of a lower unit within a stratigraphic column, the upper sample’s corrected deposit age distribution was set to that of the youngest lower in the stratigraphic section. Convolution shifted individual deposit age distributions towards zero and increased their standard deviation by an average of 365%. However, convolution decreased the standard deviations of normalized probability distribution functions of deposit ages inferred from many samples from 1340 to 1197 yr, and from 471 to 416 yr for lower and upper reaches, respectively, of the Bear Creek valley in the Oregon Coast Range. Convolution decreased estimates of mean deposit ages from 1296 to 1051 yr, and from 308 to 245 yr for lower and upper reaches, respectively, of the Bear Creek. Estimates of percentages of basin denudation passing through each reach's deposit ("trapping efficiency") increased from 11.6% to 14.4%, and from 25.4% to 31.9% for lower and upper Bear Creek, respectively. However, basic shapes of residence time distributions and, thus, inferences regarding removal of sediment from the reaches did not change after deposit dates were corrected. Sediment residence times in the lower Bear Creek valley are exponentially distributed, which implies that all sediment has a uniform probability of evacuation from deposits, whereas the power-law-distributed residence times in upper Bear imply preferential evacuation of younger deposits and preservation of older deposits. Much of the sediment transported onto valley floors via debris flows is deposited, and then is evacuated over longer times. Volumes and residence times of stored sediment in these deposits at the transition from debris flow to fluvial evacuation, and their associated width of valley floors, vary throughout a network. Export volumes and frequencies from tributaries are controls on deposit volumes and may control valley widening of mainstem valley floors. In addition, closely spaced tributaries may exert composite effects on valley floor landforms. It is hypothesized that the volumes of sediment stored at confluences increases with contributing watershed area of tributaries to the point where tributary slopes are low enough to cause most debris flows to be deposited within tributary valleys instead of in the mainstem valley. In four ~1 km reaches with contributing watershed areas of 0.3 to 5.0 km², field surveys provided measures of width of valley floors and volume of deposits, and radiocarbon dating of charcoal provided residence times of sediment in these deposits. Mean residence times of reaches vary between 1.1 and 2.5 kyr. Exponential distributions fit to residence times within two of the reaches imply evacuation of sediment independent of deposit ages. Power-law fits to residence times of the other two reaches imply age-dependent evacuation of deposits. Distribution shapes of residence times, and their means, do not vary systematically with contributing watershed area of mainstems. Mean width of mainstem valley floors increases with contributing watershed areas of both mainstems and their respective tributaries. Volumes of sediment stored on the valley floor increase with contributing areas of mainstems, and these volumes at tributary junctions peaked at tributary contributing areas of ~0.1 km². Percentage of basin denudation entering storage decreases with contributing area of mainstem. This decrease may be due to increasing percentages of sediment supply via fluvial transport for larger watersheds, and much, if not most, of this supply routes through the system quickly. / Graduation date: 2012

The professional social worker needs to understand, wide social issues, including the culture and cultural background of minority persons and groups in the United States. One mlnorlty group wlth whlch soclal work has not much contact, and thus has llttle knowledge about, ls the Chlnese. Regarding professional social work knowledge about minority groups, the Chinese could be considered a "silent minority."

Natural lake-watershed ecosystems in Oregon compose a diverse and valuable assemblage of land and water resources. With an increasing demand on lakes for recreation, water supplies, and aesthetic values and an increase in available data on Oregon lake systems, there is a need for applicable and timely scientific water management information about lake conditions statewide. This thesis is an attempt to summarize some of the data collected on natural Oregon lake-watershed ecosystems. The purpose of the thesis is to identify the most typical natural systems out of an initial data base of twenty-four variables, measured over ninety-eight lake-watershed ecosystems. The selected variables are reduced to five common factors using principal components factor analysis. K-means cluster analysis is used to create similar groups of lake systems. These groups are compared to ecoregions in Oregon and a typical, representative lake ecosystem is identified for each group. Results show that several lake systems of the state are unique.

Spaniards were the first Europeans to explore the Pacific Northwest coastline, but the only evidence of these early visits is a sprinkling of Spanish place names commemorating the intrepid voyagers. The more than four centuries of recorded history since that time are nearly devoid, of references to Spanish-speaking people, especially Mexicans and Americans of Mexican descent (Chicanos). Even the heavy influx of Chicano migrant farm workers in the 1950’s and 1960's failed to attract the attention of historians or social science researchers. By 1970, the Spanish-language population had become Oregon's largest ethnic minority and was exerting influence in most areas of state life. This study documents the depth and diversity of Oregon’s Chicano community and provides an historical context for the movement of Spanish-speaking people into the state. Even in the strongly Anglo-American milieu of the Northwest, Chicanos have retained their unique blend of Mexican and American cultural and linguistic characteristics. Through social clubs, cultural centers, economic and political organizations and an independent college, Chicanos in Oregon are preserving and proclaiming their heritage. Hopefully, this study will aid Anglo Americans in understanding and accepting cultural differences without prejudice or animosity, and help Chicanos to better appreciate their position in the state. The dominantly oral tradition of the Chicano coupled with the dearth of standard documentation, primary and secondary, required reliance upon interviews and conversations and generalization upon limited data. Research revealed that the migrant farm worker image of the Chicano has become obsolete as the Oregon population has become settled and primarily urban. If this study provides a frame of reference for and generates interest in further investigation of the migration of Chicanos into Oregon, it will have served its purpose.

During first year field placement, we worked with a number of rural families, most of them Mexican-American. It seemed to us that rural families in general and Mexican-Americans in particular were not being very well served by social service agencies. We questioned whether this might be due to a lack of Mexican-American perspective in traditional services or perhaps a lack of Mexican-American manpower or at least Spanish-speaking manpower. This study, then, developed out of a general area of interest that can be stated as three questions: (1) Do rural people (especially Mexican-Americans) feel there is a need for various social services and what do they identify as needs? (2) Do they know about social service agencies that exist and what their services are? (3) How available are those services? i.e., an existing agency may be "unavailable" because people don't know about it, because of lack of transportation, because of language/cultural barriers, because of an inappropriateness of services offered, etc.

Widely differing theoretical expectations exist concerning the economic performance of labor-managed firms or producer cooperatives (PCs). While a good number of theoretical studies of these firms by economists have been undertaken, there remain considerable gaps in the empirical record. This is especially true in the case of American PCs. In general, theoretical controversies have not been tempered by enough empirical analysis. While some expect good performance from PCs, others are much less sanguine. This study compares the economic performance of a group of eight worker-owned producer co-op plants with that of eight conventional mills in the Pacific Northwest softwood plywood industry. The purpose is to test the validity of several propositions that are typically maintained in the analysis of PCs suggesting that this type of organization basically lacks the incentive to utilize labor inputs efficiently, and is therefore less productive when compared to conventionally organized producing units. Using secondary data, pooled time-series cross-section equations are estimated. Results indicate that growth in annual output per employee per year is 18 percent greater in the co-ops than in their conventional counterparts. The study provides strong evidence that the two groups of plants differ significantly in their behavior. The major conclusion that emerges is that worker-owned co-ops are a viable and productive form of economic organization that utilize labor inputs efficiently and in doing so can achieve higher worker productivity than their conventional counterparts. In a public policy context, government support of employee ownership and establishment of worker-owned co-ops is viewed as a viable policy option to plant closings.

The purpose of this study is to investigate some widely-held assumptions regarding the value of diversification as an economic strategy. It has ofien been suggested that economic diversity enhances economic performance, either by promoting higher levels of economic well-being or by improving the ability of regions to cushion the adverse effects of economic cycles. This is the conventional wisdom, but it has not been adequately tested, although some attempts have been made to relate measures of diversity to other economic indicators (e.g., Rodgers, MacLaughlin, Conkling). The current study explores this particular issue, and the results obtained should be of interest to economists, regional scientists, and development planners and policymakers. Shannon's entropy function, applied to the distribution of employment in different economic sectors, was used as an index of diversity. This measure allows not only comparison of changes in diversity over time, but also, through its decomposition properties, a means of analyzing the nature of such changes. Economic performance was assessed in terms of unemployment and per capita income, considered in four ways: the level of the variable, its rate of change over time, the degree of instability of the level, and the degree of instability of its rate of change. Eight hypotheses were formulated and tested with data from the counties of Oregon for the ten-year period from 1972 to 1981. To provide a comparative perspective for the Oregon investigation, a U.S. study was also conducted for the same period. Calculations of both studies revealed diversity to be negatively but very weakly correlated with unemployment; the Oregon finding, however, did not quite satisfy the 5% significance standard used throughout this research. While a weak positive association was found between diversity and per capita income of Oregon counties, a larger negative association was observed between the two variables in the U.S. study. These results can be explained either as an effect of differing levels of geographic aggregation or in terms of differences among the particular specializations of low diversity counties and states. For Oregon, relations between the variables for nonrecession years were stronger than for recession years. The study further showed that diversified counties of Oregon were more stable in unemployment and per capita income and showed lower rates of growth of unemployment and higher rates of growth of per capita income than the more specialized counties. None of these associations, however, was particularly strong. For the U.S. study, no evidence was found for any relation between diversity and either growth rates or stability. In general, correlations between diversity and income-based measures were larger than between diversity and unemployment-based measures; also, percentage changes associated with differences in diversity were considerably greater for the income-based measures. Although expected patterns of relationship were thus found to hold, if weakly, for the counties of Oregon, comparison with the national study suggests that results may not be generalizable to other, especially larger, geographic units. Whether diversification is useful for regional development depends at least partially on the specific character of the industries in the region's economy.

The study proceeded as follows: The distribution of Q. garryana was mapped through field reconnaissance. Annual rings from fifteen trees were counted in order to establish age versus trunk diameter ratios. This greatly simplified the dating of trees. Transects were then run through individual groves to determine population age structures. These age structures, along with Q. garryana's distribution patterns, were graphically compared with historic temperature, precipitation, and growing season data. The effect of livestock grazing on oak reproduction was examined. Potential vagility of the species was evaluated by estimating the potential for acorn dispersion by airfall, streams, vertebrates, and the human (aboriginal) population. Finally, pollen evidence was scrutinized in conjunction with acorn dispersal rates in order to determine the longer term history of Q. garryana in this portion cf its range.