Water-seeking behavior in worm-infected crickets and reversibility of parasitic manipulation.Report as inadecuate

Water-seeking behavior in worm-infected crickets and reversibility of parasitic manipulation. - Download this document for free, or read online. Document in PDF available to download.

* Corresponding author 1 GEMI - Génétique et évolution des maladies infectieuses 2 Institute of Biology, Neuchatel 3 LMGE - Microorganismes : Génome et Environnement 4 MIVEGEC - Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle

Abstract : One of the most fascinating examples of parasite-induced host manipulation is that of hairworms, first, because they induce a spectacular -suicide- water-seeking behavior in their terrestrial insect hosts and, second, because the emergence of the parasite is not lethal per se for the host that can live several months following parasite release. The mechanisms hairworms use to increase the encounter rate between their host and water remain, however, poorly understood. Considering the selective landscape in which nematomorph manipulation has evolved as well as previously obtained proteomics data, we predicted that crickets harboring mature hairworms would display a modified behavioral response to light. Since following parasite emergence in water, the cricket host and parasitic worm do not interact physiologically anymore, we also predicted that the host would recover from the modified behaviors. We examined the effect of hairworm infection on different behavioral responses of the host when stimulated by light to record responses from uninfected, infected, and ex-infected crickets. We showed that hairworm infection fundamentally modifies cricket behavior by inducing directed responses to light, a condition from which they mostly recover once the parasite is released. This study supports the idea that host manipulation by parasites is subtle, complex, and multidimensional.

Keywords : behavior insects nematomorph parasite manipulation parasitism phototaxis

Author: Fleur Ponton - Fernando Otálora-Luna - Thierry Lefèvre - Patrick M Guerin - Camille Lebarbenchon - David Duneau - David Georges

Source: https://hal.archives-ouvertes.fr/


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