Avian trichomonosis in spotted owls (Strix occidentalis): Indication of opportunistic spillover from prey

Krysta H. Rogers, Yvette A. Girard, Leslie Woods, Christine K Johnson

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Avian trichomonosis, caused by the flagellated protozoan parasite Trichomonas gallinae, has variable pathogenicity among bird species ranging from asymptomatic infections to severe disease periodically manifesting in epidemic mortality. Traditionally, columbids are identified as highly susceptible to infection with occasional spillover into raptors that prey on infected birds. We identified avian trichomonosis in two dead California spotted owls (Strix occidentalis occidentalis) and three dead northern spotted owls (S. o. caurina) in California during 2011–2015; infection was confirmed in four owls by PCR. Pathologic lesions associated with trichomonosis in the owls included caseonecrotic lesions of the upper palate accompanied by oropharyngitis, cellulitis, myositis, and/or sinusitis. Spotted owls are known to mainly feed on small mammals; therefore, the source of infection as well as the significance of the disease in spotted owls is unclear. These owl trichomonosis cases coincided temporally and spatially with three trichomonosis epidemics in band-tailed pigeons (Patagioenas fasciata monilis). The same parasite, T. gallinae subtype A2, was isolated from the spotted owls and band-tailed pigeons, suggesting the owls became infected when opportunistically feeding on pigeons during mortality events. Avian trichomonosis is an important factor in the decline of the Pacific Coast band-tailed pigeon population with near-annual mortality events during the last 10 years and could have conservation implications for raptor species at risk, particularly those that are facing multiple threats.

Original languageEnglish (US)
Pages (from-to)305-311
Number of pages7
JournalInternational Journal for Parasitology: Parasites and Wildlife
Volume5
Issue number3
DOIs
StatePublished - Dec 1 2016

Fingerprint

Strigiformes
Strix occidentalis
trichomoniasis
Columbidae
pigeons
Raptors
birds of prey
lesions (animal)
Birds
Mortality
Parasites
Infection
Trichomonas gallinae
Trichomonas
infection
cellulitis
sinusitis
myositis
parasites
Asymptomatic Infections

Keywords

  • Avian trichomonosis
  • Band-tailed pigeon
  • Columbid
  • Epidemic
  • Fe-hydrogenase
  • ITS1/5.8S/ITS2
  • Spotted owl
  • Trichomonas gallinae

ASJC Scopus subject areas

  • Parasitology
  • Animal Science and Zoology
  • Infectious Diseases

Cite this

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title = "Avian trichomonosis in spotted owls (Strix occidentalis): Indication of opportunistic spillover from prey",
abstract = "Avian trichomonosis, caused by the flagellated protozoan parasite Trichomonas gallinae, has variable pathogenicity among bird species ranging from asymptomatic infections to severe disease periodically manifesting in epidemic mortality. Traditionally, columbids are identified as highly susceptible to infection with occasional spillover into raptors that prey on infected birds. We identified avian trichomonosis in two dead California spotted owls (Strix occidentalis occidentalis) and three dead northern spotted owls (S. o. caurina) in California during 2011–2015; infection was confirmed in four owls by PCR. Pathologic lesions associated with trichomonosis in the owls included caseonecrotic lesions of the upper palate accompanied by oropharyngitis, cellulitis, myositis, and/or sinusitis. Spotted owls are known to mainly feed on small mammals; therefore, the source of infection as well as the significance of the disease in spotted owls is unclear. These owl trichomonosis cases coincided temporally and spatially with three trichomonosis epidemics in band-tailed pigeons (Patagioenas fasciata monilis). The same parasite, T. gallinae subtype A2, was isolated from the spotted owls and band-tailed pigeons, suggesting the owls became infected when opportunistically feeding on pigeons during mortality events. Avian trichomonosis is an important factor in the decline of the Pacific Coast band-tailed pigeon population with near-annual mortality events during the last 10 years and could have conservation implications for raptor species at risk, particularly those that are facing multiple threats.",
keywords = "Avian trichomonosis, Band-tailed pigeon, Columbid, Epidemic, Fe-hydrogenase, ITS1/5.8S/ITS2, Spotted owl, Trichomonas gallinae",
author = "Rogers, {Krysta H.} and Girard, {Yvette A.} and Leslie Woods and Johnson, {Christine K}",
year = "2016",
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T1 - Avian trichomonosis in spotted owls (Strix occidentalis)

T2 - Indication of opportunistic spillover from prey

AU - Rogers, Krysta H.

AU - Girard, Yvette A.

AU - Woods, Leslie

AU - Johnson, Christine K

PY - 2016/12/1

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N2 - Avian trichomonosis, caused by the flagellated protozoan parasite Trichomonas gallinae, has variable pathogenicity among bird species ranging from asymptomatic infections to severe disease periodically manifesting in epidemic mortality. Traditionally, columbids are identified as highly susceptible to infection with occasional spillover into raptors that prey on infected birds. We identified avian trichomonosis in two dead California spotted owls (Strix occidentalis occidentalis) and three dead northern spotted owls (S. o. caurina) in California during 2011–2015; infection was confirmed in four owls by PCR. Pathologic lesions associated with trichomonosis in the owls included caseonecrotic lesions of the upper palate accompanied by oropharyngitis, cellulitis, myositis, and/or sinusitis. Spotted owls are known to mainly feed on small mammals; therefore, the source of infection as well as the significance of the disease in spotted owls is unclear. These owl trichomonosis cases coincided temporally and spatially with three trichomonosis epidemics in band-tailed pigeons (Patagioenas fasciata monilis). The same parasite, T. gallinae subtype A2, was isolated from the spotted owls and band-tailed pigeons, suggesting the owls became infected when opportunistically feeding on pigeons during mortality events. Avian trichomonosis is an important factor in the decline of the Pacific Coast band-tailed pigeon population with near-annual mortality events during the last 10 years and could have conservation implications for raptor species at risk, particularly those that are facing multiple threats.

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