Summary
The snail Biomphalaria glabrata (Say) was infected with two species of echinostomes of Brazilian origin: Paryphostomum segregatum Dietz and Echinostoma lindoense Sandground and Bonne. Snails harboring E. lindoense were easily superinfected with P. segregatum. Developing P. segregatum rediae consumed E. lindoense larvae and eventually cleared the snails of this species except for metacercarial cysts. E. lindoense rediae were unable to consume P. segregatum larvae, but they exerted indirect antagonism resulting in delayed development of P. segregatum. Snails simultaneously exposed to the two species of miracidia developed double infections, but E. lindoense larvae were ultimately destroyed in the snails. Snails infected with P. segregatum were difficult to superinfect with E. lindoense. Double infections developed only when the exposure interval was 10 days or less. P. segregatum rediae consumed E. lindoense larvae in these double infections.
Zusammenfassung
Die Schneckenart Biomphalaria glabrata (Say) wurde mit zwei Echinostomatiden-Arten aus Brasilien: Paryphostomum segregatum Dietz und Echinostoma lindoense Sandground und Bonne infiziert. Schnecken, die schon E. lindoense beherbergten, konnten leicht mit P. segregatum superinfiziert werden. Die heranwachsende Redie von P. segregatum verzehrt die Larven von E. lindoense und befreit die Schnecke von dieser Trematoden-Art, mit Ausnahme der Metacercarien-Cysten. Die Redien von E. lindoense hingegen sind nicht in der Lage, die Entwicklungsstadien von P. segregatum zu verzehren, aber sie üben einen indirekten Antagonismus aus, der sich in einer verzögerten Entwicklung von P. segregatum zeigt. Werden Schnecken gleichzeitig Mirazidien beider Trematoden-Arten ausgesetzt, dann gehen beide Infektionen an; aber die Larven von E. lindoense werden letztlich in den Schnecken vernichtet. Schnecken, die schon mit P. segregatum infiziert sind, lassen sich nur schwer mit E. lindoense superinfizieren. Beide Infektionen entwickeln sich nur, wenn der Zeitraum zwischen den beiden Infektionen 10 Tage oder weniger beträgt. Auch bei diesen Doppelinfektionen verzehren die Redien von P. segregatum die Larvenstadien von E. lindoense.
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Supported by the University of California International Center for Medical Research and Training (UC ICMRT, Hooper Foundation, San Francisco School of Medicine) with Research Grants TW 00144 from the Office of International Research, and AI 07054 from the Institute of Allergy and Infectious Diseases, National Institutes of Health, U.S. Public Health Service.
Medical student, University of California School of Medicine, San Francisco.
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Joe, L.K., Basch, P.F., Heyneman, D. et al. Antagonism between two species of echinostomes (Paryphostomum segregatum and Echinostoma lindoense) in the snail Biomphalaria glabrata . Z. F. Parasitenkunde 30, 117–125 (1968). https://doi.org/10.1007/BF00259720
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DOI: https://doi.org/10.1007/BF00259720