Evolutionary dynamics of Ceratonova species (Cnidaria: Myxozoa) reveal different host adaptation strategies

The myxozoan parasite Ceratonova shasta is an important pathogen that infects multiple species of Pacific salmonids. Ongoing genetic surveillance has revealed stable host-parasite relationships throughout the parasite's endemic range. We applied Bayesian phylogenetics to test specific hypothese...

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Bibliographic Details
Published in:Infection, genetics and evolution Vol. 78; p. 104081
Main Authors: Breyta, Rachel, Atkinson, Stephen D., Bartholomew, Jerri L.
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 01.03.2020
Subjects:
Adaptation, Physiological
ancestry
Animals
basins
Bayes Theorem
Bayesian phylogenetics
California
Ceratomyxa shasta
Ceratonova shasta
Gasterosteus aculeatus
Genotype
Host Specificity
Host-Parasite Interactions
hosts
infection
ITS-1
Klamath River
monitoring
Myxozoa - classification
Myxozoa - genetics
Myxozoa - physiology
Oncorhynchus kisutch
Oncorhynchus mykiss
Oncorhynchus tshawytscha
Oregon
Pacific salmon
parasites
pathogens
Phylogeny
Rhinichthys osculus
rivers
rRNA
Salmonidae - genetics
Salmonidae - parasitology
Sequence Analysis, DNA - methods
watersheds
Oregon
California
Ceratonova shasta
ITS-1
Pacific salmon
Bayesian phylogenetics
Klamath River
rRNA
ISSN:1567-1348, 1567-7257, 1567-7257
Online Access:Get full text
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Summary:The myxozoan parasite Ceratonova shasta is an important pathogen that infects multiple species of Pacific salmonids. Ongoing genetic surveillance has revealed stable host-parasite relationships throughout the parasite's endemic range. We applied Bayesian phylogenetics to test specific hypotheses about the evolution of these host-parasite relationships within the well-studied Klamath River watershed in Oregon and California, USA. The results provide statistical support that different genotypes of C. shasta are distinct lineages of one species, which is related to two other Ceratonova species in the same ecosystems; Ceratonova X in speckled dace and C. gasterostea in threespine stickleback. Furthermore, we found strong support for the hypothesis that C. shasta type 0 in native steelhead trout and type I in Chinook salmon each evolved with a specialist host adaptation strategy, while C. shasta type II in coho salmon resulted from a generalist host adaptation strategy. Inferred date and host species of the most recent common ancestor of extant Klamath basin types indicate that it occurred between 14,000 and 21,000 years ago, and most likely infected a native steelhead or rainbow trout host. •Field-observed differences are revealed to be two distinct evolutionary adaptation strategies that are supported by statistically significant population genetic analyses.•The most recent common ancestor of extant types occurred between 14,000–21,000 years ago, infecting a native steelhead or rainbow trout host.
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ISSN:1567-1348
1567-7257
1567-7257
DOI:10.1016/j.meegid.2019.104081