Abstract
Although trophically transmitted parasites are recognized to strongly influence food-web dynamics through their ability to manipulate host phenotype, our knowledge of their host spectrum is often imperfect. This is particularly true for the facultative paratenic hosts, which receive little interest. We investigated the occurrence and significance both in terms of ecology and evolution of paratenic hosts in the life cycle of the fish acanthocephalan Pomphorhynchus laevis. This freshwater parasite uses amphipods as intermediate hosts and cyprinids and salmonids as definitive hosts. Within a cohort of parasite larvae, usually reported in amphipod intermediate hosts, more than 90% were actually hosted by small-sized fish. We demonstrated experimentally, using one of these fish, that they get infected through the consumption of parasitized amphipods and contribute to the parasite’s transmission to a definitive host, hence confirming their paratenic host status. A better knowledge of paratenic host spectrums could help us to understand the fine tuning of transmission strategies, to better estimate parasite biomass, and could improve our perception of parasite subwebs in terms of host–parasite and predator–parasite links.
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Acknowledgments
We thank Marianne Duployer, Benjamin Gaudillat, Emilie Guyonnet, Clément Lagrue, and Marion Salignon for help in field and laboratory investigations. This study was funded in part by a grant from the ANR (BLAN07-3-183300).
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Communicated by: Sven Thatje
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Médoc, V., Rigaud, T., Motreuil, S. et al. Paratenic hosts as regular transmission route in the acanthocephalan Pomphorhynchus laevis: potential implications for food webs. Naturwissenschaften 98, 825 (2011). https://doi.org/10.1007/s00114-011-0831-y
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DOI: https://doi.org/10.1007/s00114-011-0831-y