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Differences in oviposition behaviour of two sympatric sibling species of the Ostrinia genus

By Thibaut Malausa, Benjamin Pélissié, Véronique Piveteau, Denis Bourguet and Sergine Ponsard

Abstract

Correspondance: Fax: +33 492 386 401 E-mail: thibaut.malausa@sophia.inra.frChanges in host preferences are thought to be a major source of genetic divergence between phytophagous insect taxa. In western Europe, two sympatric taxa, O. nubilalis (the European corn borer) and O. scapulalis, feed mainly on maize and hop or mugwort, respectively. These two species may have diverged without geographic isolation after a host shift of ancestral populations onto maize or another cultivated species (e.g. sorghum). A previous study using inbred laboratory strains revealed that the two species differ in their oviposition choices in maize-mugwort tests. We sampled four natural populations in France (two of each taxon) and tested their oviposition behaviour toward four of their main host plant species: maize, sorghum, mugwort and hop. O. nubilalis females showed a very high preference for laying their eggmasses on maize, whereas O. scapulalis females displayed a more balanced range of references. O. nubilalis females were attracted slightly to sorghum, suggesting that this plant is an accidental, rather than a regular and ancestral host plant of O. nubilalis. One important result arising from this study is the significant proportion of eggs laid by both Ostrinia species on hop. This may explain why some stands of hop are sometimes not only infested by O. scapulalis but also by O. nubilalis larvae, a situation preventing assortative mating based on microallopatry. Hence, further studies must be conducted to see whether the host preference in the genus Ostrinia might be linked to assortative mating by a mechanism that is not mediated by the host plan

Topics: SYMPATRIC SPECIATION, ECOLOGICAL SPECIATION, EUROPEAN CORN BORER, HOST RACE, OST PREFERENCE, INSECT, sympatric speciation, ecological speciation, Ostrinia nubilalis, Ostrinia scapulalis, European corn borer, host race, host preference, INSECTE, OSTRINIA NUBILALIS, OSTRINIA SCAPULALIS, EESPECE SYMPATRIQUE, [SDV.BID]Life Sciences [q-bio]/Biodiversity
Publisher: 'Cambridge University Press (CUP)'
Year: 2008
DOI identifier: 10.1017/S0007485307005536
OAI identifier: oai:HAL:hal-02657452v1
Provided by: HAL-CIRAD
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