Differing responses of red abalone (Haliotis rufescens) and white abalone (H. sorenseni) to infection with phageassociated Candidatus Xenohaliotis californiensis

Ashley Vater, Barbara A Byrne, Blythe C. Marshman, Lauren W. Ashlock, James D. Moore

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The Rickettsiales-like prokaryote and causative agent of Withering Syndrome (WS)- Candidatus Xenohaliotis californiensis (Ca. Xc)-decimated black abalone populations along the Pacific coast of North America. White abalone-Haliotis sorenseni-are also susceptible to WS and have become nearly extinct in the wild due to overfishing in the 1970s. Candidatus Xenohaliotis californiensis proliferates within epithelial cells of the abalone gastrointestinal tract and causes clinical signs of starvation. In 2012, evidence of a putative bacteriophage associated with Ca. Xc in red abalone-Haliotis rufescens-was described. Recently, histologic examination of animals with Ca. Xc infection in California abalone populations universally appear to have the phage- containing inclusions. In this study, we investigated the current virulence of Ca. Xc in red abalone and white abalone at different environmental temperatures. Using a comparative experimental design, we observed differences over time between the two abalone species in mortality, body condition, and bacterial load by quantitative real time PCR (qPCR). By day 251, all white abalone exposed to the current variant of Ca. Xc held in the warm water (18.5 °C) treatment died, while red abalone exposed to the same conditions had a mortality rate of only 10%, despite a relatively heavy bacterial burden as determined by qPCR of posterior esophagus tissue and histological assessment at the termination of the experiment. These data support the current status of Ca. Xc as less virulent in red abalone, and may provide correlative evidence of a protective phage interaction. However, white abalone appear to remain highly susceptible to this disease. These findings have important implications for implementation of a white abalone recovery program, particularly with respect to the thermal regimes of locations where captively-reared individuals will be outplanted.

Original languageEnglish (US)
Article numbere5104
JournalPeerJ
Volume2018
Issue number6
DOIs
StatePublished - Jan 1 2018

Fingerprint

Haliotis sorenseni
Haliotis rufescens
Bacteriophages
abalone
Infection
infection
bacteriophages
Mortality
Bacterial Load
North America
Starvation
Design of experiments
Population
Esophagus
Virulence
Coastal zones
Gastrointestinal Tract
Real-Time Polymerase Chain Reaction
Animals
Haliotis cracherodii

Keywords

  • Abalone
  • Bacteriophage
  • Candidatus xenohaliotis californiensis
  • Haliotis rufescens
  • Haliotis sorenseni
  • Ocean warming
  • Phage therapy
  • Rickettsia
  • White abalone
  • Withering syndrome

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Differing responses of red abalone (Haliotis rufescens) and white abalone (H. sorenseni) to infection with phageassociated Candidatus Xenohaliotis californiensis. / Vater, Ashley; Byrne, Barbara A; Marshman, Blythe C.; Ashlock, Lauren W.; Moore, James D.

In: PeerJ, Vol. 2018, No. 6, e5104, 01.01.2018.

Research output: Contribution to journalArticle

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abstract = "The Rickettsiales-like prokaryote and causative agent of Withering Syndrome (WS)- Candidatus Xenohaliotis californiensis (Ca. Xc)-decimated black abalone populations along the Pacific coast of North America. White abalone-Haliotis sorenseni-are also susceptible to WS and have become nearly extinct in the wild due to overfishing in the 1970s. Candidatus Xenohaliotis californiensis proliferates within epithelial cells of the abalone gastrointestinal tract and causes clinical signs of starvation. In 2012, evidence of a putative bacteriophage associated with Ca. Xc in red abalone-Haliotis rufescens-was described. Recently, histologic examination of animals with Ca. Xc infection in California abalone populations universally appear to have the phage- containing inclusions. In this study, we investigated the current virulence of Ca. Xc in red abalone and white abalone at different environmental temperatures. Using a comparative experimental design, we observed differences over time between the two abalone species in mortality, body condition, and bacterial load by quantitative real time PCR (qPCR). By day 251, all white abalone exposed to the current variant of Ca. Xc held in the warm water (18.5 °C) treatment died, while red abalone exposed to the same conditions had a mortality rate of only 10{\%}, despite a relatively heavy bacterial burden as determined by qPCR of posterior esophagus tissue and histological assessment at the termination of the experiment. These data support the current status of Ca. Xc as less virulent in red abalone, and may provide correlative evidence of a protective phage interaction. However, white abalone appear to remain highly susceptible to this disease. These findings have important implications for implementation of a white abalone recovery program, particularly with respect to the thermal regimes of locations where captively-reared individuals will be outplanted.",
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