Orientation Behavior and Feeding Ecology of the Scyphomedusa Chrysaora fuscescens

Chrysaora fuscescens is a cnidarian scyphomedusa that occurs in the northern California Current. In this upwelling system, medusae are seasonally abundant, and individuals can ingest 10-60% of the standing stock of vulnerable zooplankton taxa per day. Yet little is known about this medusa’s feeding ecology. Using laboratory pseudokreisels, C. fuscescens feeding rates and behavior were quantified in the presence of a controlled flow field. C.

An Evaluation of the Effects of Hatchery and Management Practices on Geomagnetic Orientation Behavior in Juvenile Pacific Steelhead Trout (Oncorhynchus mykiss)

Numerous populations of salmon and trout undergo extensive migrations, migrating from freshwater to the sea and throughout ocean basins. Years later they return to their natal streams with remarkable accuracy and precision. The outward migration is accomplished without the benefit of following experienced migrants or prior individual experience. Evidence suggests that Pacific salmon and trout use the earth’s geomagnetic fields when undertaking these migrations.

Essays on Regional Economic Impact Assessment and Demand Analysis Using Disaggregated Data

The appropriate use of disaggregated economic data not only improves the accuracy and robustness of economic analyses, but also extends the existing economic models to address new aspects of the issue. This dissertation consists of three essays: two essays use disaggregated economic-engineering data to address spatial heterogeneity in economic losses and regional interdependencies for Tsunami impact assessment and resilience planning in State of Oregon.

Oregon’s Fishing Community Adapting to Change in Policy, Management, and Markets: Documenting Women’s Roles and Adaptive Capacity in an Evolving Industry

Commercial fishing research often focuses on ecological (gear, stock assessment, traceability) or economic factors. Truly understanding the social-ecological system requires considering the entire “human dimension” and this includes the social, cultural, and legal/policy aspects as well. An understudied yet important factor is women’s contribution to fishing at the family and community level.

An Experimental Investigation of the Effects of Temperature and Dissolved Oxygen on the Growth of Juvenile English Sole and Juvenile Dungeness Crab

In the past two decades, occurrences of summertime upwelling-driven low dissolved oxygen (DO) events, or hypoxia, have increased along the northeast Pacific coast. If hypoxic events are severe enough to cause marine species mortality, the areas affected are often called “dead zones.” In 2002 and again in 2006, the events were lethal, resulting in mass invertebrate and fish kills. Many organisms are impacted by these events, but less mobile juvenile fishes and crabs are potentially more vulnerable to the long-term effects of these stressful conditions than adults.

Influence of Upwelling-Season Coastal Currents on Near-Bottom Dissolved Oxygen Concentrations Over a Submarine Bank

Wind-driven coastal upwelling brings subsurface water onto the central-Oregon shelf after the spring transition each year. This cold and salty source water is oxygen-poor, yet above the hypoxic threshold, dissolved oxygen < 1.4 ml l-1. Once on the shelf, dissolved oxygen (DO) concentrations of upwelled near-bottom waters are modified by physical and biological shelf processes, such as advection, mixing and microbial respiration.

Biologically Active Metabolites from Marine Microorganisms: Methods to Identify Drug Leads and Chemical Signals

Microbial natural products represent a massive repository of unique chemical scaffolds with corresponding diverse biological functions. However, in the past decade the development of natural products into new therapeutics has dwindled, in part due to the challenges posed by high rediscovery rates and low throughput associated with classical bioassay-guided fractionation methods. Recent research shows that most microbes express only a fraction of their total biosynthetic potential under standard monophyletic culture conditions.

Communicating Oceanographic Research Through Film: The Role of Film in Helping Scientists Develop and Meet Their Broader Impacts Goals

Funding agencies, specifically the National Science Foundation (NSF), are placing particular emphasis on the societal relevance and broader applications of scientific research, otherwise known as Broader Impacts (BIs). Scientists are required to address the BIs merit review criterion in their research proposals or they will not get funded. However, many scientists perceive the BIs criterion to be confusing and daunting, and developing activities to meet these requirements is often not within their expertise.

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