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Density of the Waterborne Parasite Ceratomyxa shasta and Its Biological Effects on Salmon

Creator:: Hallett, Sascha L., Ray, R. Adam, Hurst, Charlene N., Holt, Richard A., Buckles, Gerri R., Atkinson, Stephen D., and Bartholomew, Jerri L.
Abstract:: The myxozoan parasite Ceratomyxa shasta is a significant pathogen of juvenile salmonids in the Pacific Northwest of North America and is limiting recovery of Chinook (Oncorhynchus tshawytscha) and coho (O. kisutch) salmon populations in the Klamath River. We conducted a 5-year monitoring program that comprised concurrent sentinel fish exposures and...
Resource Type:: Article
Full Text:: Its Biological Effects on Salmon Sascha L. Hallett,a R. Adam Ray,b Charlene N. Hurst,a Richard A

Production of Ceratonova shasta Myxospores from Salmon Carcasses: Carcass Removal Is Not a Viable Management Option

Creator:: Foott, J. S., Stone, R., Fogerty, R., True, K., Bolick, A., Bartholomew, J. L., Hallett, S. L., Buckles, G. R., and Alexander, J. D.
Abstract:: Severe infection by the endemic myxozoan parasite, Ceratonova (synonym, Ceratomyxa) shasta, has been associated with declines in and impaired recovery efforts of populations of fall-run Chinook Salmon Oncorhynchus tshawytscha in the Klamath River, California. The parasite has a complex life cycle involving a polychaete worm host as well as a...
Resource Type:: Article
Full Text:: . Hallett, G. R. Buckles, and J. D. Alexander Department of Microbiology, Oregon State University, 226 Nash

Ice nucleation processes in upper tropospheric wave-clouds observed during SUCCESS

Creator:: Jensen, E. J., Toon, O. B., Tabazadeh, A., Sachse, G. W., Andersen, B. E., Chan, K. R., Twohy, Cynthia, Gandrud, Bruce W., Aulenbach, S. M., Heymsfield, Andrew J., Hallett, J., and Gary, B.
Abstract:: We have compared in situ measurements near the leading-edges of wave-clouds observed during the SUCCESS experiment with numerical simulations. Observations of high supersaturations with respect to ice (> 50%) near the leading edge of a very cold wave cloud (T < -60°C) are approximately consistent with recent theoretical and laboratory...
Resource Type:: Article
Full Text:: . Gandrud 4, S. M. Aulenbach 4, A. Heymsfield 4, J. Hallett 5, and B. Gary 6 Abstract. We have compared

Managing the whole landscape: historical, hybrid, and novel ecosystems

Creator:: Hobbs, Richard J., Higgs, Eric, Hall, Carol M., Bridgewater, Peter, Chapin, F. Stuart, III, Ellis, Erle C., Ewel, John J., Hallett, Lauren M., Harris, James, Hulvey, Kristen B., Jackson, Stephen T., Kennedy, Patricia L., Kueffer, Christoph, Lach, Lori, Lantz, Trevor C., Lugo, Ariel E., Mascaro, Joseph, Murphy, Stephen D., Nelson, Cara R., Perring, Michael P., Richardson, David M., Seastedt, Timothy R., Standish, Rachel J., Starzomski, Brian M., Suding, Katherine N., Tognetti, Pedro M., Yakob, Laith, and Yung, Laurie
Abstract:: The reality confronting ecosystem managers today is one of heterogeneous, rapidly transforming landscapes, particularly in the areas more affected by urban and agricultural development. A landscape management framework that incorporates all systems, across the spectrum of degrees of alteration, provides a fuller set of options for how and when to...
Resource Type:: Article

Erection of Ceratonova n. gen. (Myxosporea: Ceratomyxidae) to Encompass Freshwater Species C. gasterostea n. sp. from Threespine Stickleback (Gasterosteus aculeatus) and C. shasta n. comb. from Salmonid Fishes

Creator:: Atkinson, S. D., Foott, J. S., and Bartholomew, J. L.
Abstract:: Ceratonova gasterostea n. gen. n. sp. is described from the intestine of freshwater Gasterosteus aculeatus L. from the Klamath River, California. Myxospores are arcuate, 22.4 +/- 2.6 μm thick, 5.2 +/- 0.4 μm long, posterior angle 45 +/- 24°, with 2 sub-spherical polar capsules, diameter 2.3 +/- 0.2 μm, which...
Resource Type:: Article
Full Text:: of Parasitology 83: 262-271. Bartholomew, J. L., S. D. Atkinson, and S. L. Hallett. 2006

Estimation of transmission dynamics of the Ceratomyxa shasta actinospore to the salmonid host

Creator:: Ray, R. A. and Bartholomew, J. L.
Abstract:: Transmission dynamics of the actinospore stage of Ceratomyxa shasta to the salmonid host were investigated under field and laboratory conditions. The number of parasites transmitted and the transmission rate were compared between 2 different exposure durations and also among different water velocities, by means of field exposures. Under laboratory conditions,...
Resource Type:: Article
Full Text:: 121, 892–898. Hallett, S. L. and Bartholomew, J. L. (2006). Application of a real-time PCR assay to

Observations of ice nuclei and heterogeneous freezing in a Western Pacific extratropical storm

Creator:: Stith, J. L., Twohy, C. H., DeMott, P. J., Baumgardner, D., Campos, T., Gao, R., and Anderson, J.
Abstract:: In situ airborne sampling of refractory black carbon (rBC) particles and Ice Nuclei (IN) was conducted in and near an extratropical cyclonic storm in the western Pacific Ocean during the Pacific Dust Experiment, PACDEX, in the spring of 2007. Airmass origins were from Eastern Asia. Clouds associated primarily with the...
Resource Type:: Article
Full Text:: extratropical storm J. L. Stith1, C. H. Twohy2, P. J. DeMott3, D. Baumgardner4, T. Campos1, R. Gao5, and J

Refinements to Ice Particle Mass Dimensional and Terminal Velocity Relationships for Ice Clouds. Part I: Temperature Dependence

Creator:: Heymsfield, Andrew J., Bansemer, Aaron, and Twohy, Cynthia
Abstract:: This two-part study attempts to find appropriate mass dimension and terminal velocity relationships that, when considered together with particle size distributions (PSD), agree with coincident measurements of ice water content (IWC), and with variables related to higher moments such as the mean mass-weighted fall speed. Reliable relationships are required for...
Resource Type:: Article
Full Text:: Velocity Relationships for Ice Clouds. Part I: Temperature Dependence ANDREW J. HEYMSFIELD AND AARON

Examinations of ice formation processes in Florida cumuli using ice measurements of anvil ice crystal particle residues

Creator:: Prenni, Anthony J., DeMott, Paul J., Twohy, Cynthia, Poellot, Michael R., Kreidenweis, Sonia M., Rogers, David C., Brooks, Sarah D., Richardson, Matthew S., and Heymsfield, Andrew J.
Abstract:: A continuous flow diffusion chamber (CFDC) was used to measure ice formation by cloud particle residuals during the Cirrus Regional Study of Tropical Anvils and Cirrus Layers-Florida Area Cirrus Experiment. These measurements were directed toward determining the relative contributions of homogeneous nucleation, heterogeneous nucleation, and secondary ice formation processes to...
Resource Type:: Article
Full Text:: cumuli using ice nuclei measurements of anvil ice crystal particle residues Anthony J. Prenni,1 Paul J

Uptake of NOy on wave-cloud ice particles

Creator:: Weinheimer, A. J., Campos, T. L., Walega, J. G., Grahek, F. E., Ridley, B. A., Baumgardner, D., Twohy, Cynthia, Gandrud, Bruce W., and Jensen, E. J.
Abstract:: In flight through a wave cloud during SUCCESS on 2 May 1996, simultaneous forward- and aft- facing NOy inlets were used to infer the amount of condensed-phase NOy present on ice particles that were up to a few minutes old. Condensed-phased amounts were 25-75 pptv, or 10-20% of gas-phase NOy....
Resource Type:: Article
Full Text:: . Anderson, K.R. Chan, D. Barongardner, C. Twohy, B. Gandrud, A.J. Heymsfield, J. Hallett, and B. Gary, Ice

ScholarsArchive@OSU

Density of the Waterborne Parasite Ceratomyxa shasta and Its Biological Effects on Salmon

Production of Ceratonova shasta Myxospores from Salmon Carcasses: Carcass Removal Is Not a Viable Management Option

Ice nucleation processes in upper tropospheric wave-clouds observed during SUCCESS

Managing the whole landscape: historical, hybrid, and novel ecosystems

Erection of Ceratonova n. gen. (Myxosporea: Ceratomyxidae) to Encompass Freshwater Species C. gasterostea n. sp. from Threespine Stickleback (Gasterosteus aculeatus) and C. shasta n. comb. from Salmonid Fishes

Estimation of transmission dynamics of the Ceratomyxa shasta actinospore to the salmonid host

Observations of ice nuclei and heterogeneous freezing in a Western Pacific extratropical storm

Refinements to Ice Particle Mass Dimensional and Terminal Velocity Relationships for Ice Clouds. Part I: Temperature Dependence

Examinations of ice formation processes in Florida cumuli using ice measurements of anvil ice crystal particle residues

Uptake of NOy on wave-cloud ice particles

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