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Negative effects of parasitic lung nematodes on the fitness of a Neotropical toad (Rhinella horribilis)

Published online by Cambridge University Press:  12 March 2019

Crystal Kelehear Open the ORCID record for Crystal Kelehear [Opens in a new window] ,
Kristin Saltonstall  and
Mark E. Torchin
Crystal Kelehear*
Affiliation:
Smithsonian Tropical Research Institute, Apartado 0843-03092, Ancon, Panama, Republic of Panama
Kristin Saltonstall
Affiliation:
Smithsonian Tropical Research Institute, Apartado 0843-03092, Ancon, Panama, Republic of Panama
Mark E. Torchin
Affiliation:
Smithsonian Tropical Research Institute, Apartado 0843-03092, Ancon, Panama, Republic of Panama
*
Author for correspondence: Crystal Kelehear, E-mail: [email protected]
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Abstract

Pathogens are increasingly implicated in amphibian declines but less is known about parasites and the role they play. We focused on a genus of nematodes (Rhabdias) that is widespread in amphibians and examined their genetic diversity, abundance (prevalence and intensity), and impact in a common toad (Rhinella horribilis) in Panama. Our molecular data show that toads were infected by at least four lineages of Rhabdias, most likely Rhabdias pseudosphaerocephala, and multiple lineages were present in the same geographic locality, the same host and even the same lung. Mean prevalence of infection per site was 63% and mean intensity of infection was 31 worms. There was a significant effect of host size on infection status in the wild: larger toads were more likely to be infected than were smaller conspecifics. Our experimental infections showed that toadlets that were penetrated by many infective Rhabdias larvae grew less than those who were penetrated by few larvae. Exposure to Rhabdias reduced toadlet locomotor performance (both sustained speed and endurance) but did not influence toadlet survival. The effects of Rhabdias infection on their host appear to be primarily sublethal, however, dose-dependent reduction in growth and an overall impaired locomotor performance still represents a significant reduction in host fitness.

Keywords

AmphibiananuranBufoCentral AmericagrowthlocomotionPanamaRhabdias
Type
Research Article
Information
Parasitology , Volume 146 , Issue 7 , June 2019 , pp. 928 - 936
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Copyright
Copyright © Cambridge University Press 2019 

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Footnotes

*

Present address: Department of Biology, Geology & Physical Sciences, Sul Ross State University, Alpine, TX 79832, USA.

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