Syracuse

Impact of weed management against feral populations of oilseed rape on plant and pollinator communities in an openfield landscape

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Ricroch, A.E. | Chifflet, Rémy | Garnier, A. | Haicour, R. | Lecomte, J. | Poirel, Emilie | Vaissière, Bernard

Edité par CCSD -

International audience. (Introduction) Field margins (FM) defined as the whole crop edge are permanent non-crop habitats. FM can be biodiversity refuges and also potential relays for the spread of transgenes. The escape of oilseed rape (OSR, Brassica napus L.) from fields, whether genetically modified (GM) or not, can result in feral populations in field margins. Such GM feral populations can then potentially spread transgenes into wild and weedy species. Field margins must then be sprayed or mowed to control feral populations. Spraying herbicide onto or mowing FM may affect the plant community composition and pollinators. With concerns of a global pollination crisis, there is a need for improving pollinator habitat in highly modified landscapes. We make the assumption that OSR pollinators travel shorter distances if they find resources along their foraging path. • What are the specific components of plant abundance in field margins? • What is the maximum distance that OSR pollinators can travel in order to fertilize OSR feral plants?

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