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Oviposition strategy as a means of local adaptation to plant defence in native

Summary: Oviposition strategy as a means of
local adaptation to plant defence in native
and invasive populations of the viburnum
leaf beetle
Gaylord A. Desurmont1,*, Franck HeŽrard2 and Anurag A. Agrawal1
Department of Ecology and Evolutionary Biology, Cornell University, Corson Hall, Ithaca, NY 14853, USA
USDA ARS European Biological Control Laboratory, Campus International de Baillarguet, CS 90013
Montferrier-sur-Lez, 34988 St GeŽly-du-Fesc, Cedex, France
Herbivores have been hypothesized to adapt locally to variation in plant defences and such adaptation could
facilitate novel associations in the context of biological invasions. Here, we show that in the native range of
the viburnum leaf beetle (VLB, Pyrrhalta viburni ), two populations of geographically isolated hosts--
Viburnum opulus and Viburnum tinus--have divergent defences against VLB oviposition: negative versus
positive density-dependent egg-crushing wound responses, respectively. Populations of beetles coexisting
with each host show an adaptive behavioural response: aggregative versus non-aggregative oviposition on
V. opulus and V. tinus, respectively. In parallel, we show that in North America, where VLB is invasive, defences
of three novel hosts are negatively density-dependent, and beetles' oviposition behaviour is aggregative. Thus,
local adaptation to plant defences has the potential to facilitate the invasion of herbivores onto novel hosts.
Keywords: insect oviposition strategy; invasion ecology; adaptive deme hypothesis; Chrysomelidae;


Source: Agrawal, Anurag - Department of Ecology and Evolutionary Biology & Entomollogy, Cornell University


Collections: Environmental Sciences and Ecology