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Ribeiroia ondatrae, or the frog-mutating flatworm is a parasite in the genus Ribeiroia which is believed to be responsible for many of the recent increases in amphibian limb malformations, particularly missing, malformed, and additional hind legs. The exact mechanism of deformation has not been determined but it has been theorized that deformation results from mechanical disruption of the cells involved in limb bud formation during the amphibian larval stage.

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  • Ribeiroia ondatrae (de)
  • Ribeiroia ondatrae (es)
  • Ribeiroia ondatrae (it)
  • Ribeiroia ondatrae (en)
rdfs:comment
  • Ribeiroia ondatrae è una specie di trematode della famiglia degli . Si tratta di un parassita creduto responsabile del recente incremento, negli Stati Uniti occidentali, di malformazioni agli arti degli anfibi, in particolare l'assenza, malformazione o aggiunta di zampe posteriori. È stato infatti notato che nelle aree infettate dal R. ondatrae le popolazioni di anfibi con malformazioni agli arti sono molto maggiori rispetto a quelle nelle zone non infette. Le specie note soggette a tale infezione sono , , Lithobates pipiens, , Taricha torosa, Anaxyrus boreas, , Rana luteiventris e . (it)
  • Ribeiroia ondatrae ist ein parasitischer Saugwurm, dessen Larven Amphibien befallen können und bei infizierten Tieren zu Missbildungen wie deformierten, fehlenden oder überzähligen Gliedmaßen führen kann. (de)
  • Ribeiroia ondatrae es un parásito en el género Ribeiroia, que se cree que es responsable de muchos de los aumentos recientes en las malformaciones de las extremidades de los anfibios, especialmente las patas traseras faltantes, malformadas y adicionales. El mecanismo exacto de la deformación no se ha determinado, pero se ha teorizado que la deformación se debe a la ruptura mecánica de las células involucradas en la formación de la yema de las extremidades durante la etapa larvaria de anfibios. (es)
  • Ribeiroia ondatrae, or the frog-mutating flatworm is a parasite in the genus Ribeiroia which is believed to be responsible for many of the recent increases in amphibian limb malformations, particularly missing, malformed, and additional hind legs. The exact mechanism of deformation has not been determined but it has been theorized that deformation results from mechanical disruption of the cells involved in limb bud formation during the amphibian larval stage. (en)
name
  • Ribeiroia ondatrae (en)
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  • (en)
synonyms
  • *Psilostomum ondatrae (Price, 1931) *Cercaria thomasi (McMullen, 1938) *Ribeiroia insignis (Travassos, 1939) *Pseudopsilostoma ondatrae (Yamaguti, 1958) *Ribeiroia thomasi (Yamaguti, 1958) (en)
taxon
  • Ribeiroia ondatrae (en)
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  • Ribeiroia ondatrae ist ein parasitischer Saugwurm, dessen Larven Amphibien befallen können und bei infizierten Tieren zu Missbildungen wie deformierten, fehlenden oder überzähligen Gliedmaßen führen kann. Im Jahre 2002 veröffentlichten Pieter Johnson von der University of Wisconsin und Kollegen anderer Institute in der Zeitschrift Ecological Monographs (Bd. 72, S. 151) Forschungsergebnisse zu Untersuchungen an 12.000 Amphibien mit Missbildungen. Bei mit dem Saugwurm Ribeiroia ondatrae „infizierten Tieren findet man abgekapselte Ruhestadien, so genannte Zysten, unter der Haut an den Ansatzstellen von Extremitäten und Schwanz. Es stellte sich heraus, dass nur mit dem Ausmaß des Parasitenbefalls ein Zusammenhang zu den Deformationen hergestellt werden konnte“ und nicht wie zuvor vermutet ein direkter Zusammenhang mit der Konzentration von Nitrat, Phosphat oder Pflanzenschutzmitteln. „Je stärker die Amphibienpopulation mit Ribeiroia infiziert war, desto häufiger und schwerwiegender waren die Missbildungen.“ (de)
  • Ribeiroia ondatrae es un parásito en el género Ribeiroia, que se cree que es responsable de muchos de los aumentos recientes en las malformaciones de las extremidades de los anfibios, especialmente las patas traseras faltantes, malformadas y adicionales. En estudios recientes, se encontró que en las áreas infectadas con R. ondatrae, la población de malformaciones de las extremidades de anfibios era mucho mayor que las poblaciones en las que este trematodo no estaba presente. Cada especie estudiada mostró resultados variables. Por ejemplo, se encontró que los anfibios de las especies Pseudacris regilla, Rana aurora y Taricha torosa exhiben físicamente una mayor frecuencia en el número de anomalías. ​ El mecanismo exacto de la deformación no se ha determinado, pero se ha teorizado que la deformación se debe a la ruptura mecánica de las células involucradas en la formación de la yema de las extremidades durante la etapa larvaria de anfibios. (es)
  • Ribeiroia ondatrae, or the frog-mutating flatworm is a parasite in the genus Ribeiroia which is believed to be responsible for many of the recent increases in amphibian limb malformations, particularly missing, malformed, and additional hind legs. It was first reported from livers of Ondatra, hence its specific name. In recent studies, it was found that in areas infected with R. ondatrae, the population of amphibian limb malformations was much higher than populations in which this trematode was not present. Each species studied showed varying results. For example, amphibians of species Pseudacris regilla, Rana aurora and Taricha torosa were found to physically display a higher frequency in the number of abnormalities. The exact mechanism of deformation has not been determined but it has been theorized that deformation results from mechanical disruption of the cells involved in limb bud formation during the amphibian larval stage. (en)
  • Ribeiroia ondatrae è una specie di trematode della famiglia degli . Si tratta di un parassita creduto responsabile del recente incremento, negli Stati Uniti occidentali, di malformazioni agli arti degli anfibi, in particolare l'assenza, malformazione o aggiunta di zampe posteriori. È stato infatti notato che nelle aree infettate dal R. ondatrae le popolazioni di anfibi con malformazioni agli arti sono molto maggiori rispetto a quelle nelle zone non infette. Le specie note soggette a tale infezione sono , , Lithobates pipiens, , Taricha torosa, Anaxyrus boreas, , Rana luteiventris e . (it)
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