Abstract:
:Insects harbour a wild diversity of symbionts that can spread and persist within populations by providing benefits to their host. The pea aphid Acyrthosiphon pisum maintains a facultative symbiosis with the bacterium Hamiltonella defensa, which provides enhanced resistance against the aphid parasitoid Aphidius ervi. Although the mechanisms associated with this symbiotic-mediated protection have been investigated thoroughly, little is known about its evolutionary effects on parasitoid populations. We used an experimental evolution procedure in which parasitoids were exposed either to highly resistant aphids harbouring the symbiont or to low innate resistant hosts free of H. defensa. Parasitoids exposed to H. defensa gained virulence over time, reaching the same parasitism rate as those exposed to low aphid innate resistance only. A fitness reduction was associated with this adaptation as the size of parasitoids exposed to H. defensa decreased through generations. This study highlighted the considerable role of symbionts in host-parasite co-evolutionary dynamics.
journal_name
J Evol Bioljournal_title
Journal of evolutionary biologyauthors
Dion E,Zélé F,Simon JC,Outreman Ydoi
10.1111/j.1420-9101.2010.02207.xsubject
Has Abstractpub_date
2011-04-01 00:00:00pages
741-50issue
4eissn
1010-061Xissn
1420-9101journal_volume
24pub_type
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