Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 8 of 8
Full-Text Articles in Entire DC Network
Field-Based Evaluations Of Horizontal Flat-Plate Fish Screens, B. P. Rose, M. G. Mesa, Gayle Barbin-Zydlewski
Field-Based Evaluations Of Horizontal Flat-Plate Fish Screens, B. P. Rose, M. G. Mesa, Gayle Barbin-Zydlewski
Marine Sciences Faculty Scholarship
Diversions from streams are often screened to prevent the loss of or injury to fish. Hydraulic criteria meant to protect fish that encounter screens have been developed, but primarily for screens that are vertical to the water flow rather than horizontal. For this reason, we measured selected hydraulic variables and released wild rainbow trout Oncorhynchus mykiss over two types of horizontal flat-plate fish screens in the field. Our goal was to assess the efficacy of these screens under a variety of conditions in the field and provide information that could be used to develop criteria for safe fish passage. We …
Use Of Electroshock For Euthanizing And Immobilizing Adult Spring Chinook Salmon In A Hatchery, Gayle Zydlewski, W. Gale, J. Holmes, J. Johnson, T. Brigham, W. Thorson
Use Of Electroshock For Euthanizing And Immobilizing Adult Spring Chinook Salmon In A Hatchery, Gayle Zydlewski, W. Gale, J. Holmes, J. Johnson, T. Brigham, W. Thorson
Marine Sciences Faculty Scholarship
This study evaluated the use of electroshock as in alternative to traditional techniques for immobilizing and euthanizing hatchery fish. We used a commercially available electroanesthesia unit at the U.S. Fish and Wildlife Service's Carson National Fish Hatchery (Carson, Washington) to euthanize adult spring Chinook salmon Oncorhynchus tshawytscha and to son and collect gametes of fish at maturation. During euthanization by electroshock, the response of each fish was observed, Muscular and vertebral hemorrhaging wits quantified, and electrical settings were optimized accordingly. During gamete collection, fish were either electroshocked or exposed to tricaine methanesulfortate (MS-222); hemorrhaging, egg viability. egg size and quantity, …
Diffusion At Work: An Interactive Simulation, Lee Karp-Boss, Emmanuel Boss, J. Loftin
Diffusion At Work: An Interactive Simulation, Lee Karp-Boss, Emmanuel Boss, J. Loftin
Marine Sciences Faculty Scholarship
No abstract provided.
How Plankton Swim: An Interdisciplinary Approach For Using Mathematics & Physics To Understand The Biology Of The Natural World, T. W. Clay, J. B. Fox, D. Grunbaum, Peter Jumars
How Plankton Swim: An Interdisciplinary Approach For Using Mathematics & Physics To Understand The Biology Of The Natural World, T. W. Clay, J. B. Fox, D. Grunbaum, Peter Jumars
Marine Sciences Faculty Scholarship
The authors have developed and field-tested high school-level curricular materials that guide students to use biology, mathematics, and physics to understand plankton and how these tiny organisms move in a world where their intuition does not apply. The authors chose plankton as the focus of their materials primarily because the challenges faced by plankton are novel problems to most students, forcing adoption of new perspectives and making the study of plankton exciting. Additional reasons that they chose plankton to focus on include their ecological importance, their availability to most teachers and students, the ease with which they can be collected …
Carbon-Based Primary Productivity Modeling With Vertically Resolved Photoacclimation, T. Westberry, M. J. Behrenfeld, D. A. Siegel, Emmanuel Boss
Carbon-Based Primary Productivity Modeling With Vertically Resolved Photoacclimation, T. Westberry, M. J. Behrenfeld, D. A. Siegel, Emmanuel Boss
Marine Sciences Faculty Scholarship
Net primary production (NPP) is commonly modeled as a function of chlorophyll concentration (Chl), even though it has been long recognized that variability in intracellular chlorophyll content from light acclimation and nutrient stress confounds the relationship between Chl and phytoplankton biomass. It was suggested previously that satellite estimates of backscattering can be related to phytoplankton carbon biomass (C) under conditions of a conserved particle size distribution or a relatively stable relationship between C and total particulate organic carbon. Together, C and Chl can be used to describe physiological state (through variations in Chl:C ratios) and NPP. Here, we fully develop …
Three Years Of Ocean Data From A Bio-Optical Profiling Float, Emmanuel Boss, Mary Jane Perry, Dana Swift, Lisa Taylor, Peter Brickley, J. Ron V. Zaneveld, Stephen Riser
Three Years Of Ocean Data From A Bio-Optical Profiling Float, Emmanuel Boss, Mary Jane Perry, Dana Swift, Lisa Taylor, Peter Brickley, J. Ron V. Zaneveld, Stephen Riser
Marine Sciences Faculty Scholarship
Ocean color, first measured from space 30 years ago, has provided a revolutionary synoptic view of near-surface fields of phytoplankton pigments. Since 1979, a number of ocean color satellite missions have provided coverage of phytoplankton biomass and other biogeochemical variables on scales of days to years and of kilometers to ocean basin. Because of the nature of visible light and its interaction with absorbing and scattering materials in the ocean and atmosphere, these measurements are biased toward nearsurface waters and are obscured by clouds. As a consequence, ocean color satellites miss significant fractions of phytoplankton biomass, marine primary productivity, and …
Satellite-Derived Variability In Chlorophyll, Wind Stress, Sea Surface Height, And Temperature In The Northern California Current System, R. M. Venegas, P. T. Strub, E. Beier, R. Letelier, Andrew Thomas, T. Cowles, C. James, L. Soto-Mardones, C. Cabrera
Satellite-Derived Variability In Chlorophyll, Wind Stress, Sea Surface Height, And Temperature In The Northern California Current System, R. M. Venegas, P. T. Strub, E. Beier, R. Letelier, Andrew Thomas, T. Cowles, C. James, L. Soto-Mardones, C. Cabrera
Marine Sciences Faculty Scholarship
Satellite-derived data provide the temporal means and seasonal and nonseasonal variability of four physical and biological parameters off Oregon and Washington ( 41 degrees - 48.5 degrees N). Eight years of data ( 1998 - 2005) are available for surface chlorophyll concentrations, sea surface temperature ( SST), and sea surface height, while six years of data ( 2000 - 2005) are available for surface wind stress. Strong cross-shelf and alongshore variability is apparent in the temporal mean and seasonal climatology of all four variables. Two latitudinal regions are identified and separated at 44 degrees - 46 degrees N, where the …
Decadal Variability In The Northeast Pacific In A Physical-Ecosystem Model: Role Of Mixed Layer Depth And Trophic Interactions, M. Alexander, A. Capotondi, A. Miller, Fei Chai, R. Brodeur, C. Deser
Decadal Variability In The Northeast Pacific In A Physical-Ecosystem Model: Role Of Mixed Layer Depth And Trophic Interactions, M. Alexander, A. Capotondi, A. Miller, Fei Chai, R. Brodeur, C. Deser
Marine Sciences Faculty Scholarship
A basin-wide interdecadal change in both the physical state and the ecology of the North Pacific occurred near the end of 1976. Here we use a physical-ecosystem model to examine whether changes in the physical environment associated with the 1976-1977 transition influenced the lower trophic levels of the food web and if so by what means. The physical component is an ocean general circulation model, while the biological component contains 10 compartments: two phytoplankton, two zooplankton, two detritus pools, nitrate, ammonium, silicate, and carbon dioxide. The model is forced with observed atmospheric fields during 1960-1999. During spring, there is a …