Index Catalog // ScholarsArchive@OSU

A High-Speed, Wireless Network for Ship-to-Ship and Ship-to-Shore Data Exchange

Creator:: Potter, Nathan D. and Cowles, Timothy J.
Abstract:: Wireless networking equipment was installed on three research vessels and at three shore stations during the 1998 Thin Layers Experiment in East Sound, Washington. This wireless network provided high-speed data communication between scientists on separate vessels and permitted rapid transfer of data from vessels and from moored instruments to a...
Resource Type:: Article
Full Text:: Data Exchange NATHAN D. POTTER AND TIMOTHY J. COWLES College of Oceanic and Atmospheric Sciences

Edge gradients provide evidence of ecological interactions in planktonic thin layers

Creator:: Benoit-Bird, Kelly J., Cowles, Timothy J., and Wingard, Christopher E.
Abstract:: Physical, optical, and acoustical data from Monterey Bay, California, USA, describing the distributions of phytoplankton, zooplankton, and small fish as well as gradients in the physical habitat were used to examine the interactions between vertically compressed plankton structures (thin layers), their consumers, and the local physical forces they experience. The...
Resource Type:: Article
Full Text:: Benoit-Bird, Kelly J., Timothy J. Cowles, and Christopher E

In situ monitoring of ocean chlorophyll via laser-induced fluorescence backscattering through an optical fiber

Creator:: Cowles, Timothy J., Moum, James N., Desiderio, Russell A., and Angel, Stanley M.
Abstract:: The first seagoing test of a prototype laser/fiber-optic system for in situ detection of ocean chlorophyll fluorescence is described. Radiation at 488 nm originating from a shipboard argon laser was transmitted through 20 of 200-µm core optical fiber to the distal tip mounted on the microstructure profiler, the Rapid Sampling...
Resource Type:: Article
Full Text:: fluorescence backscattering through an optical fiber Timothy J. Cowles, James N. Moum, Russell A. Desiderio

Multiple excitation fluorometer for in situ oceanographic applications

Creator:: Desiderio, Russell A., Moore, Casey, Lantz, Carl, and Cowles, Timothy J.
Abstract:: A new in situ fluorometer for the detection of oceanic photosynthetic pigment fluorescence is described. Emission spectra from 546 to 733 nm are recorded for each of three different visible excitation bands ten times a second. A Spectralon cell is used to improve the excitation coupling to and the collection...
Resource Type:: Article
Full Text:: , Casey Moore, Carl Lantz, and Timothy J. Cowles A new in situ fluorometer for the detection of oceanic

Mesoscale physical and bio-optical structure of the Antarctic Polar Front near 170°W during austral spring

Creator:: Barth, John A., Cowles, Timothy J., and Pierce, Stephen D.
Abstract:: As part of the U.S. Joint Global Ocean Flux Study Southern Ocean program, high-resolution surveys of the Antarctic Polar Front near 170øW were conducted during October-November 1997 with a towed undulating system equipped with conductivity-temperature-depth and bio-optical sensors. Transects along 170°W and two successive mapping surveys revealed zonal bands with...
Resource Type:: Article
Full Text:: Antarctic Polar Front near 170øW during austral spring John A. Barth, Timothy J. Cowles, and Stephen D

Mesoscale variablility in bacterial activity in the Northeast Pacific Ocean off Oregon, USA

Creator:: Sherr, Evelyn, Sherr, Barry F., and Cowles, Timothy J.
Abstract:: Variation in bacterial abundance and activity was assessed by sampling the upper 35 to 80 m of the water column during 2 to 5 d periods at 3 sites: eutrophic-mesotrophic midshelf, mesotrophic-oligotrophic slope, and oligotrophic gyre edge, off the Oregon coast in late summer 1997 and 1998. Bacterial abundances varied...
Resource Type:: Article
Full Text:: J. Cowles College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon

Spectral variability of the particulate backscattering ratio

Creator:: Whitmire, Amanda L., Boss, Emmanuel, Cowles, Timothy J., and Pegau, W. Scott
Abstract:: The spectral dependency of the particulate backscattering ratio is relevant in the fields of ocean color inversion, light field modeling, and inferring particle properties from optical measurements. Aside from theoretical predictions for spherical, homogeneous particles, we have very limited knowledge of the actual in situ spectral variability of the particulate...
Resource Type:: Article
Full Text:: ratio A. L. Whitmire1, E. Boss2, T. J. Cowles1, and W. S. Pegau3 1College of Oceanic & Atmospheric

Microstructure Profiles of Laser-induced Chlorophyll Fluorescence Spectra: Evaluation of Backscatter and Forward-Scatter Fiber-Optic Sensors

Creator:: Desiderio, Russell A., Cowles, Timothy J., Moum, James N., and Myrick, Michael
Abstract:: The implementation and characterization of backscatter and forward-scatter fiber-optic fluorescence sensors attached to a microstructure profiling instrument are described. By using an optical multichannel array detector to record emission spectra, eight profiles per hour of chlorophyll fluorescence spectra at 2-cm intervals can be obtained throughout the upper 100 m of...
Resource Type:: Article

Phenology in Calanus funmarchicus; hypotheses about control mechanisms

Creator:: Miller, Charles B., Cowles, Timothy J., Wiebe, Peter H., Copley, Nancy J., and Grigg, Helen
Abstract:: Calanus finmarchicus (Gunnerus) stratify narrowly near 500 m depth during their fifth copepodite resting phase in North Atlantic Slope Water off southern New England, USA. They probably achieve this by migration to a specific, daytime isolume. Photoperiod information provided by light intensity at depth could serve as a cure for...
Resource Type:: Article
Full Text:: Charles B. ille er', Timothy J. ~ o w l e s ' , Peter H. w i e b e 2 , Nancy J. copley2, Helen ~ r i g

Distribution and variability of iron input to Oregon coastal waters during the upwelling season

Creator:: Chase, Zanna, Hales, Burke, Cowles, Timothy J., Schwartz, Roseanne, and van Geen, Alexander
Abstract:: We measured iron concentrations off the Oregon coast in spring (May–June) and summer (August) of 2001 as part of the Coastal Ocean Advances in Shelf Transport (COAST) program. Dissolvable and total dissolvable iron levels in surface waters were generally higher in spring (mean of 2.1 and 33.9 nmol L¯¹, respectively)...
Resource Type:: Article
Full Text:: Oregon coastal waters during the upwelling season Zanna Chase, Burke Hales, and Timothy Cowles College

Spectral backscattering properties of marine phytoplankton cultures

Creator:: Whitmire, Amanda L., Pegau, W. Scott, Karp-Boss, Lee, Boss, Emmanuel, and Cowles, Timothy J.
Abstract:: The backscattering properties of marine phytoplankton, which are assumed to vary widely with differences in size, shape, morphology and internal structure, have been directly measured in the laboratory on a very limited basis. This work presents results from laboratory analysis of the backscattering properties of thirteen phytoplankton species from five...
Resource Type:: Article
Full Text:: and Timothy J. Cowles 1 1Oregon State University, College of Oceanic & Atmospheric Sciences, 104

Injection of carbon from the shelf to offshore beneath the euphoic zone in the California Current

Creator:: Barth, John A., Cowles, Timothy J., Kosro, P. Michael, 1951-, Shearman, R. Kipp, Huyer, Adriana, 1945-, and Smith, Robert L. (Robert Lloyd), 1935-
Abstract:: High concentrations of chlorophyll are found in the California Current System over 300 km offshore, far from the productive coastal upwelling region, and between 150 and 250 m, well below the depth to which photosynthetically active solar radiation penetrates. This exceptionally deep chlorophyll feature is formed near the coast and...
Resource Type:: Article
Full Text:: beneath the euphotic zone in the California Current John A. Barth, Timothy J. Cowles, P. Michael Kosro

SeaWIFS satellite ocean color data from the Southern Ocean

Creator:: Moore, Keith J., Abbott, Mark R., Richman, James G., Smith, Walker O., Cowles, Timothy J., Coale, Kenneth H., Gardner, Wilford D., and Barber, Richard T.
Abstract:: SeaWiFS estimates of surface chlorophyll concentrations are reported for the region of the U.S. JGOFS study in the Southern Ocean (∼ 170 °W, 60 °S). Elevated chlorophyll was observed at the Southern Ocean fronts, near the edge of the seasonal ice sheet, and above the Pacific Antarctic Ridge. The elevated...
Resource Type:: Article
Full Text:: 2, Timothy J. Cowles l, Kenneth H. Coale 3, Wilford D. Gardner 4, Richard T. Barber • Abstract

Water mass subduction and the transport of phytoplankton in a coastal upwelling system

Creator:: Washburn, Libe, Kadko, David C., Jones, Burton H., Hayward, Thomas, Kosro, P. Michael, 1951-, Stanton, Timothy P., Ramp, Steve, and Cowles, Timothy
Abstract:: Observations during the Coastal Transition Zone (CTZ) experiment in summer 1988 reveal the presence of deep phytoplankton layers in a coastal upwelling system. The layers occur throughout the CTZ study area, including a strong baroclinic jet which was present over the period of the experiment. On the basis of a...
Resource Type:: Article
Full Text:: P. STANTON, 6 STEVE RAMP, 6 AND TIMOTHY COWLES 3 Observations during the Coastal Transition Zone

Satellite-derived variability in chlorophyll, wind stress, sea surface height, and temperature in the northern California Current System

Creator:: Venegas, Roberto M., Strub, P. Ted, Beier, Emilio, Letelier, Ricardo M., Thomas, Andrew C., Cowles, Timothy J., James, Corinne, Soto-Mardones, Luis, and Cabrera, Carlos
Abstract:: Satellite-derived data provide the temporal means and seasonal and nonseasonal variability of four physical and biological parameters off Oregon and Washington (41°–48.5°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...
Resource Type:: Article
Full Text:: . Venegas,1 P. Ted Strub,1 Emilio Beier,2 Ricardo Letelier,1,3 Andrew C. Thomas,4 Timothy Cowles,1 Corinne

Currents and water masses of the coastal transition zone off Northern California, June to August 1988

Creator:: Huyer, Adriana, 1945-, Kosro, P. Michael, 1951-, Fleischbein, Jane, Ramp, Steven R., Stanton, Tim, Washburn, Libe, Chavez, Francisco P., Cowles, Timothy J., Pierce, Stephen D., and Smith, Robert L. (Robert Lloyd), 1935-
Abstract:: In summer 1988, we made repeated mesoscale surveys of a grid extending 200 km offshore between 37°N and 39°N in the coastal transition zone off northern California, obtaining continuous acoustic Doppler current profiler data and conductivity-temperature-depth data at standard stations 25 km apart on alongshore sections 40 km apart. All...
Resource Type:: Article
Full Text:: TIM STANTON, 2 LIBE WASHBURN, TM FRANCISCO P. CHAVEZ, 5 TIMOTHY J. COWLES, l STEPHEN D. PIERCE, l

The structure of the transition zone between coastal waters and the open ocean off northern California, winter and spring 1987

Creator:: Kosro, P. Michael, 1951-, Huyer, Adriana, 1945-, Ramp, S. R., Smith, Robert L. (Robert Lloyd), 1935-, Chavez, F. P., Cowles, Timothy J., Abbott, Mark R., Strub, P. Ted, Barber, R. T., Jessen, P., and Small, Lawrence F.
Abstract:: Physical and biological fields in the coastal transition zone off northern California were measured during February, March, May and June 1987 in an extended alongshore region between 60 km and 150 km offshore. The spring transition, as seen in coastal sea level and winds, occurred in mid-March. Surface variability during...
Resource Type:: Article

Zooplankton Distribution and Transport in the California Current off Oregon

Creator:: Wu, D., Zhou, M., Pierce, S. D., Barth, John A., and Cowles, T.
Abstract:: This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Inter-Research and can be found at: https://doi.org/10.3354/meps10835
Resource Type:: Article
Full Text:: Wu, D, Zhou, M., Pierce, S. D., Barth, J. A., & Cowles, T. (2014). Zooplankton distribution and

Flow-topography interactions in the northern California Current System observed from geostationary satellite data

Creator:: Castelao, Renato M., Barth, John A., and Mavor, Timothy P.
Abstract:: Data from Geostationary Operational Environmental Satellites are used to study the seasonal evolution of temperature fronts in the northern California Current System (CCS), focusing on the interactions with topographic features. Fronts first appear close to the coast in response to upwelling winds, moving offshore with the continuous input of energy...
Resource Type:: Article
Full Text:: California Current System, Deep Sea Res., Part II, 47, 783–810. Barth, J. A., S. D. Pierce, and T. J. Cowles

Sea surface temperature fronts in the California Current System from geostationary satellite observations

Creator:: Castelao, Renato M., Mavor, Timothy P., Barth, John A., and Breaker, Laurence C.
Abstract:: Sea surface temperature (SST) fronts are determined for the 2001–2004 time period from Geostationary Operational Environmental Satellites (GOES) data in the California Current System (CCS). The probability of detecting a SST front at an individual pixel location in the CCS is presented as a bi-monthly climatology. Fronts clearly indicate the...
Resource Type:: Article
Full Text:: ., T. J. Cowles, P. M. Kosro, R. K. Shearman, A. Huyer, and R. L. Smith (2002), Injection of carbon

Nutritional Quality of Douglas-fir Wood: Effect of Vertical and Horizontal Position on Nutrient Levels

Creator:: Schowalter, Timothy D. and Morrell, Jeffrey J.
Abstract:: The chemical composition of the boles of 14 Douglas-fir trees growing in the central Willamette Valley of western Oregon was examined to determine whether differences in various chemical component levels might help to explain arthropod or microbial colonization patterns. Levels of nearly all cations as well as N and P...
Resource Type:: Article
Full Text:: AND HORIZONTAL POSITION ON NUTRIENT LEVELS' Timothy D. Schowalter Professor Department of

Kelvin wave signatures in stratospheric trace constituents

Creator:: Mote, Philip W. and Dunkerton, Timothy J.
Abstract:: Connections, sometimes tenuous, have previously been noted between stratospheric Kelvin waves and several stratospheric trace constituents. The present study finds evidence of Kelvin wave signatures in ozone from the Microwave Limb Sounder (MLS) and Cryogenic Limb Array Etalon Spectrometer (CLAES) instruments aboard the Upper Atmosphere Research Satellite. Predominant variations near...
Resource Type:: Article
Full Text:: constituents Philip W. Mote and Timothy J. Dunkerton Northwest Research Associates, Bellevue, Washington, USA

Ecological Restoration and Artificial Intelligence: Whose Values Inform a Project?

Creator:: Woodrich, Samuel T. and Pape, Timothy
Abstract:: Significant attention has been given to how artificial intelligence (AI) can be utilized by society and in scientific fields in recent years. This article explores how AI tools utilized in various fields have been and can be applied to ecological restoration projects, their affiliated benefits and drawbacks, and what those...
Resource Type:: Article
Full Text:: . Woodrich1,2, Timothy Pape3 1Environmental Sciences Department, Oregon State University, Corvallis, OR 97331

Canopy arthropod assemblages in four overstory and three understory plant species in a mixed-conifer old-growth forest in California

Creator:: Schowalter, Timothy D. and Zhang, Yanli
Abstract:: We compared canopy arthropod assemblages among overstory conifer and understory angiosperm species at Teakettle Experimental Forest in the Sierra Nevada in California during 1998–2000. Arthropods were sampled from upper, middle, and lower crown levels of one overstory tree of each of the four dominant conifer species (Jeffrey pine, sugar pine,...
Resource Type:: Article
Full Text:: Understory Plant Species in a Mixed-Conifer Old-Growth Forest in California Timothy D. Schowalter and Yanli

Trace element abundances in the Rock Canyon Anticline, Pueblo, Colorado, marine sedimentary section and their relationahip to Caribbean plateau construction and oxygen anoxic event 2

Creator:: Snow, Laura J., Duncan, Robert A., and Bralower, Timothy J.
Abstract:: Rapid eruption of submarine lava flows during formation of the Caribbean plateau correlates closely with ocean anoxic event 2 (OAE2), which bracketed the Cenomanian/Turonian boundary (~93.5 Ma). These events also correspond with a positive excursion in carbon isotopic composition of seawater. Hydrothermal activity associated with large-scale submarine volcanism may have...
Resource Type:: Article
Full Text:: Sciences, Oregon State University, Corvallis, Oregon, USA Timothy J. Bralower Department of Geosciences

Sub-seasonal variations in lower stratospheric water vapor

Creator:: Mote, Philip W., Dunkerton, Timothy J., and Pumphrey, Hugh C.
Abstract:: Observations of water vapor with high temporal and spatial resolution and good horizontal coverage just above the tropical tropopause have been scarce, but a preliminary version of such data has been developed using radiance measurements of the Microwave Limb Sounder. These data reveal distinct variations with periods in the ranges...
Resource Type:: Article
Full Text:: variations in lower stratospheric water vapor Philip W. Mote and Timothy J. Dunkerton Northwest Research

Kelvin waves in stratospheric temperature observed by the Microwave Limb Sounder

Creator:: Mote, Philip W., Dunkerton, Timothy J., and Wu, Dong
Abstract:: The three-dimensional (3-D) structure of stratospheric Kelvin waves is revealed using data from the Microwave Limb Sounder for the period July 1992 to April 1993. Four Kelvin wave modes are identified, two for zonal wave number 1 (k = 1) and two for k = 2, using extended empirical orthogonal...
Resource Type:: Article
Full Text:: by the Microwave Limb Sounder Philip W. Mote and Timothy J. Dunkerton Northwest Research Associates

Informative g-Priors for Logistic Regression

Creator:: Hanson, Timothy E., Branscum, Adam J., and Johnson, Wesley O.
Abstract:: Eliciting information from experts for use in constructing prior distributions for logistic regression coefficients can be challenging. The task is especially difficult when the model contains many predictor variables, because the expert is asked to provide summary information about the probability of “success” for many subgroups of the population. Often,...
Resource Type:: Article
Full Text:: Logistic Regression Timothy E. Hanson ∗, Adam J. Branscum † and Wesley O. Johnson ‡ Abstract. Eliciting

Forest-floor Disturbance Reduces Chipmunk (Tamias spp.) Abundance Two Years after Variable-retention Harvest of Pacific Northwestern Forests

Creator:: Wilk, Randall J., Harrington, Timothy B., Gitzen, Robert A., and Maguire, Chris C.
Abstract:: We evaluated the two-year effects of variable-retention harvest on chipmunk (Tamias spp.) abundance (Nˆ ) and habitat in mature coniferous forests in western Oregon and Washington because wildlife responses to density/pattern of retained trees remain largely unknown. In a randomized complete-block design, six treatments were applied to 13-ha units at...
Resource Type:: Article
Full Text:: Northwestern Forests Wilk, R. J., Harrington, T. B., Gitzen, R. A., & Maguire, C. C. (2015). Forest-Floor

Tidally Forced Internal Waves and Overturns Observed on a Slope: Results from HOME

Creator:: Levine, Murray D. and Boyd, Timothy John, 1958-2013
Abstract:: Tidal mixing over a slope was explored using moored time series observations on Kaena Ridge extending northwest from Oahu, Hawaii, during the Survey component of the Hawaii Ocean Mixing Experiment (HOME). A mooring was instrumented to sample the velocity and density field of the lower 500 m of the water...
Resource Type:: Article
Full Text:: : Results from HOME MURRAY D. LEVINE AND TIMOTHY J. BOYD College of Oceanic and Atmospheric Sciences

Defining the word "Seamount"

Creator:: Staudigel, Hubert, Koppers, Anthony A. P., Lavelle, J. William, Pitcher, Tony J., and Shank, Timothy M.
Abstract:: Reading through this issue of Oceanography, it will become apparent that researchers in different disciplines see their seamounts in quite different ways. The term seamount has been defined many times (e.g., Menard, 1964; Wessel, 2001; Schmidt and Schmincke, 2000; Pitcher et al., 2007; International Hydrographic Organization, 2008; Wessel et al.,...
Resource Type:: Article
Full Text:: | Defining the Word “Seamount” By Hubert Staudigel, Anthony A.P. Koppers, J. William Lavelle, Tony J. Pitcher

Biophysical feedback mediates effects of invasive grasses on coastal dune shape

Creator:: Zarnetske, Phoebe L., Hacker, Sally D., Seabloom, Eric W., Ruggiero, Peter, Killian, Jason R., Maddux, Timothy B., and Cox, Daniel
Abstract:: Vegetation at the aquatic–terrestrial interface can alter landscape features through its growth and interactions with sediment and fluids. Even similar species may impart different effects due to variation in their interactions and feedbacks with the environment. Consequently, replacement of one engineering species by another can cause significant change in the...
Resource Type:: Article
Full Text:: . KILLIAN,4 TIMOTHY B. MADDUX,4 AND DANIEL COX5 1Department of Zoology, Oregon State University, 3029

Movements and Settlement Site Selection of Pygmy Rabbits After Experimental Translocation

Creator:: Lawes, Timothy J., Anthony, Robert G., Robinson, W. Douglas, Forbes, James T., and Lorton, Glenn A.
Abstract:: We investigated the movements and selection of settlement sites of translocated pygmy rabbits (Brachylagus idahoensis) in southeastern Oregon from June to December 2008. We captured, radio tagged, and translocated 59 pygmy rabbits across big sagebrush (Artemisia tridentata ssp.) habitat with 3 categories of landscape fragmentation. We used radio telemetry to...
Resource Type:: Article
Full Text:: Site Selection of Pygmy Rabbits After Experimental Translocation TIMOTHY J. LAWES,1 Oregon Cooperative

Intraseasonal variations of water vapor in the tropical upper troposphere and tropopause region

Creator:: Mote, Philip W., Clark, Hannah L., Dunkerton, Timothy J., Harwood, Robert S., and Pumphrey, Hugh C.
Abstract:: We show the signature of the tropical intraseasonal oscillation (TIO) in upper tropospheric moisture and dynamical fields, roughly between 200 and 100 hPa. Relationships among these fields are examined using lag-correlation analysis and using multivariate extended empirical orthogonal functions (MEEOFs), which maximize the shared explained variance among several fields for...
Resource Type:: Article
Full Text:: tropopause region Philip W. Mote, 1'2 Hannah L. Clark, Harwood, 3 and Hugh C. Pumphrey 3 3 Timothy J

Local and General Above-Ground Biomass Functions for Pinus palustris Trees

Creator:: Gonzalez-Benecke, Carlos A., Zhao, Dehai, Samuelson, Lisa J., Martin, Timothy A., Leduc, Daniel J., and Jack, Steven B.
Abstract:: There is an increasing interest in estimating biomass for longleaf pine (Pinus palustris Mill.), an important tree species in the southeastern U.S. Most of the individual-tree allometric models available for the species are local, relying on stem diameter outside bark at breast height (DBH) and total tree height (HT), but...
Resource Type:: Article
Full Text:: Trees Carlos A. Gonzalez-Benecke 1,* ID , Dehai Zhao 2 ID , Lisa J. Samuelson 3, Timothy A. Martin 4 ID

Convectively Driven Mixing in the Bottom Boundary Layer

Creator:: Moum, J. N., Perlin, A., Klymak, J. M., Levine, M. D., Boyd, Timothy John, 1958-2013, and Kosro, P. M.
Abstract:: Closely spaced vertical profiles through the bottom boundary layer over a sloping continental shelf during relaxation from coastal upwelling reveal structure that is consistent with convectively driven mixing. Parcels of fluid were observed adjacent to the bottom that were warm (by several millikelvin) relative to fluid immediately above. On average,...
Resource Type:: Article
Full Text:: American Meteorological Society Convectively Driven Mixing in the Bottom Boundary Layer J. N. MOUM, A

Horizontal transport and the distribution of nutrients in the coastal transition zone off Northern California: effects on primary production, phytoplankton biomass and species composition

Creator:: Chavez, Francisco P., Barber, Richard T., Kosro, P. Michael, 1951-, Huyer, Adriana, 1945-, Ramp, Steven R., Stanton, Timothy P., and Rojas de Mendiola, Blanca
Abstract:: Conductivity‐temperature‐depth surveys during 1988 encountered strong baroclinic jets that were evident in acoustic Doppler current profiler and hydrographic data. During June and July 1988 a filament with high surface nitrate, high chlorophyll, abundant populations of neritic centric diatoms, and higher rates of primary production was evident perpendicular to the coast...
Resource Type:: Article
Full Text:: FRANCISCO P. CHAVEZ 1, RICHARD T. BARBER 2, P. MICHAEL KOSRO 3, ADRIANA HUYER 3, STEVEN R. RAMP 4, TIMOTHY

Response of Higbbush Blueberry to Nitrogen Fertilizer during Field Establishment-II. Plant Nutrient Requirements in Relation to Nitrogen Fertilizer Supply

Creator:: Bryla, David R., Strik, Bernadine C., Banados, M. Pilar, and Righetti, Timothy L.
Abstract:: A study was done to determine the macro- and micronutrient requirements of young northern highbush blueberry plants (Vaccinium corymbosum L. ‘Bluecrop’) during the first 2 years of establishment and to examine how these requirements were affected by the amount of nitrogen (N) fertilizer applied. The plants were spaced 1.2 ×...
Resource Type:: Article
Full Text:: , Casilla 306-22, Santiago, Chile Timothy L. Righetti University of Guam, UOG Station, Mangilao, Guam

Simulation of Water and Energy Fluxes in an Old-Growth Seasonal Temperate Rain Forest Using the Simultaneous Heat and Water (SHAW) Model

Creator:: Link, Timothy E., Flerchinger, Gerald N., Unsworth, Mike, and Marks, Danny
Abstract:: In the Pacific Northwest (PNW), concern about the impacts of climate and land cover change on water resources and flood-generating processes emphasizes the need for a mechanistic understanding of the interactions between forest canopies and hydrologic processes. Detailed measurements during the 1999 and 2000 hydrologic years were used to modify...
Resource Type:: Article
Full Text:: Using the Simultaneous Heat and Water (SHAW) Model TIMOTHY E. LINK Department of Forest Resources

Evolving interest and sense of self in an environmental citizen science program

Creator:: He, Yurong, Parrish, Julia K., Rowe, Shawn, and Jones, Timothy
Abstract:: Citizen science is a growing phenomenon across many branches of environmental science facilitating both increased science literacy and the collection of highly rigorous, longitudinal data. Understanding the motivations of adults to join and remain active in citizen science programs is important as the diversity and abundance of opportunities for public...
Resource Type:: Article
Full Text:: Alliance. He, Y., J. K. Parrish, S. Rowe, and T. Jones. 2019. Evolving interest and sense of self in an

Response of Highbush Blueberry to Nitrogen Fertilizer During Field Establishment, I: Accumulation and Allocation of Fertilizer Nitrogen and Biomass

Creator:: Pilar Banados, M., Strik, Bernadine C., Bryla, David R., and Righetti, Timothy L.
Abstract:: The effects of nitrogen (N) fertilizer application on plant growth, N uptake, and biomass and N allocation in highbush blueberry (Vaccinium corymbosum L. 'Bluecrop') were determined during the first 2 years of field establishment. Plants were either grown without N fertilizer after planting (0N) or were fertilized with 50, 100,...
Resource Type:: Article
Full Text:: Avenue, Corvallis, OR 97330 Timothy L. Righetti University of Guam, UOG Station, Mangilao, Guam 96923

Impacts of repeated wildfire on long-unburned plant communities of the southern Appalachian Mountains

Creator:: Hagan, Donald L., Waldrop, Thomas A., Reilly, Matthew, and Shearman, Timothy M.
Abstract:: The infrequent occurrence of large wildfires in the southern Appalachian Mountains over the last several decades has offered few opportunities to study their impacts. From 2000 to 2008, five wildfires burned a large portion of the area in and surrounding the Linville Gorge Wilderness in North Carolina. Areas were burned...
Resource Type:: Article
Full Text:: Donald L. HaganA,E, Thomas A. WaldropB, Matthew ReillyC and Timothy M. ShearmanD AClemson University

Exploring Linkage of Quality Management to Innovation

Creator:: Leavengood, Scott, Anderson, Timothy R., and Daim, Tugrul U.
Abstract:: In many business sectors today, focus on quality as a competitive tool is being replaced by a focus on innovation. Research exploring connections between quality management, innovation, and company performance suggests that quality is ‘necessary but insufficient’ in business today. In short, managers need to know how to adapt their...
Resource Type:: Article
Full Text:: Quality Management to Innovation Scott Leavengood1, Timothy R. Anderson2 , Tugrul U. Daim2 1Oregon

An a priori process for selecting candidate reference lakes for a national survey

Creator:: Herlihy, Alan T., Sobota, Janel Banks, McDonnell, Todd C., Sullivan, Timothy J., Lehmann, Sarah, and Tarquinio, Ellen
Abstract:: One of the biggest challenges when conducting a national-scale assessment of lakes, such as the 2007 US National Lake Assessment (NLA), is finding enough reference lakes to set appropriate expectations for the assessed sites. In the NLA, a random design was used to select lakes for sampling to make unbiased...
Resource Type:: Article
Full Text:: State University, Corvallis, Oregon 97331 USA Todd C. McDonnell3 AND Timothy J. Sullivan4 E&S

Vertical velocity, vertical diffusion, and dilution by midlatitude air in the tropical lower stratosphere

Creator:: Mote, Philip W., Dunkerton, Timothy J., McIntyre, Michael E., Ray, Eric A., Haynes, Peter H., and Russell, James M.
Abstract:: Air passing upward through the tropical tropopause is “marked” by an annually varying water vapor mixing ratio much as a tape recorder marks a magnetic tape; as the air ascends in the tropical stratosphere, these marks are effaced by a combination of vertical diffusion within the tropics and dilution of...
Resource Type:: Article
Full Text:: the tropical lower stratosphere Philip W. Mote, 1'2 Timothy J. Dunkerton, 1 Michael E. Mcintyre, 3

A modified law-of-the-wall applied to oceanic bottom boundary layers

Creator:: Perlin, A., Moum, James N., Klymak, J. M., Levine, Murray D., Boyd, Timothy John, 1958-2013, and Kosro, P. Michael
Abstract:: Near the bottom, the velocity profile in the bottom boundary layer over the continental shelf exhibits a characteristic law-of-the-wall that is consistent with local estimates of friction velocity from near-bottom turbulence measurements. Farther from the bottom, the velocity profile exhibits a deviation from the law-of-the-wall. Here the velocity gradient continues...
Resource Type:: Article
Full Text:: bottom boundary layers A. Perlin, J. N. Moum, J. M. Klymak,1 M. D. Levine, T. Boyd, and P. M. Kosro

Detection of ORF6 protein associated with latent KHV infection

Creator:: Reed, Aimee, Ostertag-Hill, Claire, Jin, Ling, Miller-Morgan, Timothy J., Wu, Zhixing, Lin, Lisa, and Wang, Qing
Abstract:: Koi herpesvirus (KHV) is highly pathogenic to Cyprinus carpio. KHV can also become latent in recovered fish and reactivate from latency under stressful conditions. Understanding KHV latency is important for development of strategies against herpesvirus latent infection. Our previous studies found KHV ORF6 mRNA is detectable during latent infection. In...
Resource Type:: Article

Delayed effects of capture-induced barotrauma on physical conditionand behavioral competency of recompressed yelloweye rockfish, Sebastes ruberrimus

Creator:: Rankin, Polly S., Hannah, Robert W., Blume, Matthew T. O., Miller-Morgan, Timothy J., and Heidel, Jerry R.
Abstract:: Rebuilding of some U.S. West Coast rockfish (Sebastes spp.) stocks relies heavily on mandatory fishery discard, however the long-term condition of discarded fish experiencing capture-related barotrauma is unknown. We conducted two studies designed to evaluate delayed mortality, physical condition,and behavioral competency of yelloweye rockfish, Sebastes ruberrimus, experiencing barotrauma during capture...
Resource Type:: Article

The potential for top-down control on tropical tunas based on size structure of predator-prey interactions

Creator:: Hunsicker, Mary E., Olson, Robert J., Essington, Timothy E., Maunder, Mark N., Duffy, Leanne M., and Kitchell, James F.
Abstract:: The ecological consequences of widespread fisheries-induced reductions of large pelagic predators are not fully understood. Tropical tunas are considered a main component of apex predator guilds that include sharks and billfishes, and thus may seem unsusceptible to secondary effects of fishing top predators. However, intra-guild predation can occur because of...
Resource Type:: Article

Comparative behavior of red lionfish Pterois volitans on native Pacific versus invaded Atlantic coral reefs

Creator:: Cure, Katherine, Benkwitt, Cassandra E., Kindinger, Tye L., Pickering, Emily A., Pusack, Timothy J., McIlwain, Jennifer L., and Hixon, Mark A.
Abstract:: Pacific red lionfish Pterois volitans have invaded Atlantic reefs and reached much greater population densities than on native reefs. We hypothesized that lionfish on invaded reefs would (1) experience higher kill rates and thus spend less time hunting, given the naïveté of Atlantic prey, (2) consume a greater variety of...
Resource Type:: Article

Search Constraints

Search Results

Limit your search