Document Detail


Density of the waterborne parasite Ceratomyxa shasta and its biological effects on salmon.
MedLine Citation:
PMID:  22407689     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
Sascha L Hallett; R Adam Ray; Charlene N Hurst; Richard A Holt; Gerri R Buckles; Stephen D Atkinson; Jerri L Bartholomew
Related Documents :
18047129 - Effect of tio2 particle size on the performance of viologen-anchored tio2 electrochromi...
23383639 - Optimizing the industrial wastewater pretreatment by activated carbon and coagulation: ...
21050019 - Sublimation rate of tnt microcrystals in air.
20485339 - Comparison of dust released from sanding conventional and nanoparticle-doped wall and w...
20501339 - Increasing particle size of a synthetic smectite for polymer nanocomposites using a sup...
20373749 - Shape- and size-controlled synthesis of monoclinic erooh and cubic er2o3 from micro- to...
20069869 - Dynamics of ph modification of an acidic protein bait used for tropical fruit flies (di...
23109569 - Removal of pharmaceutical residue in municipal wastewater by daf (dissolved air flotati...
23978289 - Nanofibers-based nanoweb promise superhydrophobic polyaniline: from star-shaped to leaf...
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-03-09
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  78     ISSN:  1098-5336     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-26     Completed Date:  2012-08-15     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3724-31     Citation Subset:  IM    
Affiliation:
Department of Microbiology, Oregon State University, Corvallis, Oregon, USA. halletts@science.oregonstate.edu
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animals
Fish Diseases / mortality,  parasitology*,  pathology
Genotype
Myxozoa / classification,  genetics,  isolation & purification*,  pathogenicity*
Northwestern United States
Parasitic Diseases, Animal / mortality,  parasitology*,  pathology
Rivers
Salmonidae / parasitology*
Severity of Illness Index
Survival Analysis
Water / parasitology*
Chemical
Reg. No./Substance:
7732-18-5/Water
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Central role of dynamic tidal biofilms dominated by aerobic hydrocarbonoclastic bacteria and diatoms...
Next Document:  Psychrotolerant Paenibacillus tundrae isolates from barley grains produce new cereulide-like depsipe...