Field evidence for non-host predator avoidance in a manipulated amphipod.

Die Naturwissenschaften
Vincent Médoc, Jean-Nicolas Beisel

Abstract

Manipulative parasites are known to alter the spatial distribution of their intermediate hosts in a way that enables trophic transmission to definitive hosts. However, field data on the ecological implications of such changes are lacking. In particular, little is known about the spatial coexistence between infected prey and dead-end predators after a parasite-induced habitat shift. Here, we used an Amphipoda (Gammarus roeseli)-Acanthocephala (Polymorphus minutus) association to investigate how infection with a manipulative parasite affects the predation risk by non-hosts within the invertebrate community. First, we collected invertebrates by sampling various natural habitats and calculated the distribution amplitude of amphipods according to their infection status. Infection with P. minutus significantly reduced the habitat breadth in G. roeseli, parasitised individuals being mainly found in floating materials whereas uninfected ones were widespread throughout the sampled habitats. Second, to test if these changes also affect the risk for P. minutus to be ingested by non-hosts, we estimated the predation risk experienced by G. roeseli within the macro-invertebrate community. The habitat overlap between potential invertebrate pr...Continue Reading

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Citations

Aug 23, 2012·PloS One·Eric GismondiCarole Cossu-Leguille
Jul 31, 2012·PloS One·Eric GismondiCarole Cossu-Leguille
Apr 16, 2010·Trends in Parasitology·Frank CézillyMarie-Jeanne Perrot-Minnot
Apr 29, 2020·Biological Reviews of the Cambridge Philosophical Society·Marion FayardMarie-Jeanne Perrot-Minnot
Dec 12, 2012·The Journal of Experimental Biology·Fanny MaureFrédéric Thomas

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