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

http://ir.library.oregonstate.edu/concern/defaults/fj236365n

This is the publisher’s final pdf. The published article is copyrighted by American Society for Microbiology and can be found at:  http://www.asm.org/.

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • 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 water sampling across 212 river kilometers of the Klamath River. We used percent mortality and degree-days to death to measure disease severity in fish. We analyzed water samples using quantitative PCR and Sanger sequencing, to determine total parasite density and relative abundance of C. shasta genotypes, which differ in their pathogenicity to salmonids. We detected the parasite throughout the study zone, but parasite density and genetic composition fluctuated spatially and temporally. Chinook and coho mortality increased with density of their specific parasite genotype, but mortality-density thresholds and time to death differed. A lethality threshold of 40% mortality was reached with 10 spores liter(⁻¹) for Chinook but only 5 spores liter(⁻¹) for coho. Parasite density did not affect degree-days to death for Chinook but was negatively correlated for coho, and there was wider variation among coho individuals. These differences likely reflect the different life histories and genetic heterogeneity of the salmon populations. Direct quantification of the density of host-specific parasite genotypes in water samples offers a management tool for predicting host population-level impacts.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Hallett, S. L., Ray, R. A., Hurst, C. N., Holt, R. A., Buckles, G. R., Atkinson, S. D., & Bartholomew, J. L. (2012). Density of the waterborne parasite ceratomyxa shasta and its biological effects on salmon. Applied and Environmental Microbiology, 78(10), 3724-3731. doi: 10.1128/AEM.07801-11
Academic Affiliation
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Language
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2012-07-26T15:33:26Z (GMT). No. of bitstreams: 1 HallettSaschaLMicrobiologyDensityWaterborneParasite.pdf: 746336 bytes, checksum: 6e620e202efa1e26583e273fc3448ed0 (MD5) Previous issue date: 2012-05
  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2012-07-26T15:33:26Z (GMT) No. of bitstreams: 1 HallettSaschaLMicrobiologyDensityWaterborneParasite.pdf: 746336 bytes, checksum: 6e620e202efa1e26583e273fc3448ed0 (MD5)
  • description.provenance : Submitted by Deborah Campbell (deborah.campbell@oregonstate.edu) on 2012-07-25T20:28:49Z No. of bitstreams: 1 HallettSaschaLMicrobiologyDensityWaterborneParasite.pdf: 746336 bytes, checksum: 6e620e202efa1e26583e273fc3448ed0 (MD5)

Relationships

In Administrative Set:
Last modified: 07/21/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items