Did the introduction of maize into Europe provide enemy-free space to Ostrinia nubilalis ? Parasitism differences between two sibling species of the genus Ostrinia

Did the introduction of maize into Europe provide enemy-free space to Ostrinia nubilalis ? Parasitism differences between two sibling species of the genus Ostrinia Pelissie B. auteur aut IRD Ponsard S. auteur aut IRD Tokarev Y. S. auteur aut IRD Audiot P. auteur aut IRD Pelissier C. auteur aut IRD Sabatier R. auteur aut IRD Meusnier S. auteur aut IRD Chaufaux J. auteur aut IRD Delos M. auteur aut IRD Campan E. auteur aut IRD Malysh J. M. auteur aut IRD Frolov A. N. auteur aut IRD Bourguet Denis auteur aut IRD text journalArticle eng text/pdf born digital access We examined whether maize offers enemy-free space (EFS) to its pest Ostrinia nubilalis, and may thereby have contributed to its divergence from the sibling species, Ostrinia scapulalis, feeding mainly on mugwort, when introduced into Europe five centuries ago. We collected Ostrinia larvae on maize (70 populations, 8425 individuals) and mugwort (10 populations, 1184 individuals) and recorded parasitism using both traditional (counting emerging parasitoids) and molecular methods (detection by specific polymerase chain reaction). The main parasitoid was Macrocentrus cingulum (Braconidae). On mugwort, parasitism was twice that on maize, and parasitoid-related mortality was 8 times higher. This suggests that maize affords substantial EFS to Ostrinia feeding on it. The lower Mortality:Infestation ratio in maize suggests that O. nubilalis' immune response might be stronger than that of O. scapulalis. If so, adapting to maize and diverging from O. scapulalis would decrease the impact of parasitism on O. nubilalis at both ecological and evolutionary levels. specialized agricultural pest ecological speciation enemy-free space Lydella thompsoni Macrocentrus cingulum microsporidia molecular detection Ostrinia nubilalis Ostrinia scapulalis Pseudoperichaeta nigrolineata 076 Journal of Evolutionary Biology 23 2 350-361 2010 1010-061X https://www.documentation.ird.fr/hor/fdi:010049297 10.1111/j.1420-9101.2009.01903.x 1010-061X [F B010049297] https://www.documentation.ird.fr/hor/fdi:010049297 https://www.documentation.ird.fr/intranet/publi/2010/02/010049297.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2010-03-10 2017-08-23 fdi:010049297 fre