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Parasite (Ribeiroia ondatrae) Infection Linked to Amphibian Malformations in the Western United States

Pieter T. J. Johnson ; Lunde, Kevin B. ; Thurman, E. Michael ; Ritchie, Euan G. ; Wray, Simon N. ; Sutherland, Daniel R. ; Kapfer, Joshua M. ; Frest, Terrence J. ; Bowerman, Jay ; Blaustein, Andrew R.

Ecological monographs, 2002-05, Vol.72 (2), p.151-168 [Periódico revisado por pares]

Washington, DC: Ecological Society of America

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Título:
Parasite (Ribeiroia ondatrae) Infection Linked to Amphibian Malformations in the Western United States
Autor: Pieter T. J. Johnson ; Lunde, Kevin B. ; Thurman, E. Michael ; Ritchie, Euan G. ; Wray, Simon N. ; Sutherland, Daniel R. ; Kapfer, Joshua M. ; Frest, Terrence J. ; Bowerman, Jay ; Blaustein, Andrew R.
Assuntos: abnormality frequency in amphibians ; Ambystoma ; amphibian ; Amphibians ; Animal and plant ecology ; Animal helminthic diseases ; Animal, plant and microbial ecology ; Animals ; Biological and medical sciences ; Birth defects ; Bufo ; Demecology ; Frogs ; Fundamental and applied biological sciences. Psychology ; Helminthic diseases ; Hyla ; Infections ; Infectious diseases ; Larvae ; Larval development ; limb deformity, amphibians ; Medical sciences ; Metacercariae ; Parasite hosts ; parasite-induced malformations ; Parasites ; Parasitic diseases ; Pathology ; Pesticides ; Planorbella snails vs. Ribeiroia infection ; Rana ; Reptiles & amphibians ; Reptilia. Amphibia ; Ribeiroia ondatrae ; Snails ; Taricha ; trematode ; Vertebrata
É parte de: Ecological monographs, 2002-05, Vol.72 (2), p.151-168
Notas: pieter@jsd.claremont.edu
Present address: University of Wisconsin, Center for Limnology, 680 North Park Street, Madison, Wisconsin 53706‐1492, USA. E‐mail
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Descrição: Parasites and pathogens can influence the survivorship, behavior, and very structure of their host species. For example, experimental studies have shown that trematode parasites can cause high frequencies of severe limb malformations in amphibians. In a broad-scale field survey covering parts of California, Oregon, Washington, Idaho, and Montana, we examined relationships between the frequency and types of morphological abnormalities in amphibians and the abundance of trematode parasite infection, pH, concentrations of 61 pesticides, and levels of orthophosphate and total nitrate. We recorded severe malformations at frequencies ranging from 1% to 90% in nine amphibian species from 53 aquatic systems. Infection of larvae by the trematode Ribeiroia ondatrae was associated with, and functionally related to, higher frequencies of amphibian limb malformations than found in uninfected populations (≤5%). Parasites were concentrated around the basal tissue of hind limbs in infected anurans, and malformations associated with infection included skin webbings, supernumerary limbs and digits, and missing or malformed hind limbs. In the absence of Ribeiroia, amphibian populations exhibited low (0-5%) frequencies of abnormalities involving missing digits or distal portions of a hind limb. Species were affected differentially by the parasite, and Ambystoma macrodactylum, Hyla regilla, Rana aurora, R. luteiventris, and Taricha torosa typically exhibited the highest frequencies of abnormalities. None of the water-quality variables measured was associated with malformed amphibians, but aquatic snail hosts (Planorbella spp.) were significant predictors of the presence and abundance of Ribeiroia infection. Morphological comparisons of adult specimens of Ribeiroia collected from different sites and raised in experimental definitive hosts suggested that all samples represented the same species-R. ondatrae. These field results, coupled with experimental research on the effects of Ribeiroia on amphibians, demonstrate that Ribeiroia infection is an important and widespread cause of amphibian limb malformations in the western United States. The relevance of trematode infection to declines of amphibian populations and the influence of habitat modification on the pathology and life cycle of Ribeiroia are emphasized as areas requiring further research.
Editor: Washington, DC: Ecological Society of America
Idioma: Inglês

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Parasite (Ribeiroia ondatrae) Infection Linked to Amphibian Malformations in the Western United States

Pieter T. J. Johnson ; Lunde, Kevin B. ; Thurman, E. Michael ; Ritchie, Euan G. ; Wray, Simon N. ; Sutherland, Daniel R. ; Kapfer, Joshua M. ; Frest, Terrence J. ; Bowerman, Jay ; Blaustein, Andrew R.

Washington, DC: Ecological Society of America

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