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Characterization of Dermotheca sp. Infection in a midwestern state-endangered salamander (Ambystoma platineum) and a co-occurring common species (Ambystoma texanum)

Published online by Cambridge University Press:  08 January 2020

Laura Adamovicz Open the ORCID record for Laura Adamovicz [Opens in a new window] ,
Daniel B. Woodburn ,
Stephany Virrueta Herrera ,
Kelsey Low ,
Christopher A. Phillips ,
Andrew R. Kuhns ,
John A. Crawford  and
Matthew C. Allender
Laura Adamovicz*
Affiliation:
Wildlife Epidemiology Lab, University of Illinois, 2001 S Lincoln Ave, Urbana, IL61802, USA
Daniel B. Woodburn
Affiliation:
Zoological Pathology Program, College of Veterinary Medicine, University of Illinois, 3300 Golf Road, Brookfield, Illinois, USA
Stephany Virrueta Herrera
Affiliation:
Program in Ecology, Evolution, and Conservation Biology, University of Illinois, 505 South Goodwin Ave, Urbana, IL61801, USA Illinois Natural History Survey, Prairie Research Institute, 615 E Peabody Dr, Champaign, IL61820, USA
Kelsey Low
Affiliation:
Program in Ecology, Evolution, and Conservation Biology, University of Illinois, 505 South Goodwin Ave, Urbana, IL61801, USA Illinois Natural History Survey, Prairie Research Institute, 615 E Peabody Dr, Champaign, IL61820, USA
Christopher A. Phillips
Affiliation:
Illinois Natural History Survey, Prairie Research Institute, 615 E Peabody Dr, Champaign, IL61820, USA
Andrew R. Kuhns
Affiliation:
Illinois Natural History Survey, Prairie Research Institute, 615 E Peabody Dr, Champaign, IL61820, USA
John A. Crawford
Affiliation:
National Great Rivers Research and Education Center, One Confluence Way, East Alton, IL62024, USA
Matthew C. Allender
Affiliation:
Wildlife Epidemiology Lab, University of Illinois, 2001 S Lincoln Ave, Urbana, IL61802, USA
*
Author for correspondence: Laura Adamovicz, E-mail: [email protected]
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Abstract

Ichthyosporean parasites (order Dermocystida) can cause morbidity and mortality in amphibians, but their ecology and epidemiology remain understudied. We investigated the prevalence, gross and histologic appearance, and molecular phylogeny of a novel dermocystid in the state-endangered silvery salamander (Ambystoma platineum) and the co-occurring, non-threatened small-mouthed salamander (Ambystoma texanum) from Illinois. Silvery salamanders (N = 610) were sampled at six ephemeral wetlands from 2016 to 2018. Beginning in 2017, 1–3 mm raised, white skin nodules were identified in 24 silvery salamanders and two small-mouthed salamanders from five wetlands (prevalence = 0–11.1%). Skin biopsy histology (N = 4) was consistent with dermocystid sporangia, and necropsies (N = 3) identified infrequent hepatic sporangia. Parasitic 18S rRNA sequences (N = 5) from both salamander species were identical, and phylogenetic analysis revealed a close relationship to Dermotheca viridescens. Dermocystids were not identified in museum specimens from the same wetlands (N = 125) dating back to 1973. This is the first report of Dermotheca sp. affecting caudates in the Midwestern United States. Future research is needed to determine the effects of this pathogen on individual and population health, and to assess whether this organism poses a threat to the conservation of ambystomatid salamanders.

Keywords

Ambystoma jeffersonianum complexamphibianemerging infectious diseaseIchthyosporeaMesomycetozoea.
Type
Research Article
Information
Parasitology , Volume 147 , Issue 3 , March 2020 , pp. 360 - 370
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Copyright
Copyright © Cambridge University Press 2019

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