Intraspecific conflict over host manipulation between different larval stages of an acanthocephalan parasite. - Archive ouverte HAL Access content directly
Journal Articles Journal of Evolutionary Biology Year : 2010

Intraspecific conflict over host manipulation between different larval stages of an acanthocephalan parasite.

Abstract

Competitive interactions between coinfecting parasites are expected to be strong when they affect transmission success. When transmission is enhanced by altering host behaviour, intraspecific conflict can lead to 'coinfection exclusion' by the first-in parasite or to a 'sabotage' of behavioural manipulation by the youngest noninfective parasite. We tested these hypotheses in the acanthocephalan parasite Pomphorhynchus laevis, reversing phototaxis in its intermediate host Gammarus pulex. No evidence was found for coinfection exclusion in gammarids sequentially exposed to infection. Behavioural manipulation was slightly weakened but not cancelled in gammarids infected with mixed larval stages. Therefore, coinfecting infective and noninfective larvae both suffered competition, potentially resulting in delayed transmission and increased risk of mortality, respectively. Consequently, noninfective larva is not just a 'passive passenger' in the manipulated host, which raises interesting questions about the selective pressures at play and the mechanisms underlying manipulation.

Dates and versions

hal-00535643 , version 1 (12-11-2010)

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Lucile Dianne, Thierry Rigaud, Elsa Léger, Sébastien Motreuil, Alexandre Bauer, et al.. Intraspecific conflict over host manipulation between different larval stages of an acanthocephalan parasite.. Journal of Evolutionary Biology, 2010, 23 (12), pp.2648-2655. ⟨10.1111/j.1420-9101.2010.02137.x⟩. ⟨hal-00535643⟩
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