Pollination is essential for many crops since 70% of the world's cultivated plants depend on pollinators for their production. Floral resources within cultivated areas, especially those produced by flowering crops such as oilseed rape, are known to have a positive effect on wild pollinators. Nevertheless, little is known about the contribution of other floral resources, such as weeds within cultivated areas, in supporting wild pollinator communities and subsequent pollination services. Here, we investigate the extent to which oilseed rape pollination benefits from floral resources produced within cultivated areas, either crops or associated weeds. Based on the Müller index, we analyzed, during four pairs of consecutive years, the potential for inter-annual indirect effects received by oilseed rape through shared wild pollinators from major crops, and their associated weeds, in a typical French intensive agricultural landscape. Our results show that most of the support for oilseed rape pollinating fauna came from alternative types of floral resources than itself. We also find that weeds support oilseed rape pollination as much as flowering crops. Finally, we show that weeds growing within cereal fields have a major contribution to the support of oilseed rape pollination, exceeding the contribution of other floral resources, except oilseed rape. Our results underline that oilseed rape pollination benefits from floral resources present within cultivated fields, whatever the type of crops, including those that do not depend on pollinators for their pollination. Management practices like herbicide reduction in non-pollinator-dependent crops such as cereals are thus likely to impact the pollination of pollinator-dependent crops.

授粉对许多作物来说是必不可少的，因为世界上 70% 的栽培植物依赖授粉媒介进行生产。众所周知，耕地内的花卉资源，尤其是油菜等开花作物生产的花卉资源，对野生传粉媒介具有积极影响。然而，对于其他花卉资源（例如耕地内的杂草）在支持野生传粉媒介群落和随后的授粉服务方面的贡献知之甚少。在这里，我们调查了油菜授粉在多大程度上受益于耕地内生产的花卉资源，无论是作物还是相关的杂草。基于 Müller 指数，我们分析了在连续四对年份中，在典型的法国集约型农业景观中，油菜通过来自主要作物及其相关杂草的共享野生授粉媒介受到的年际间接影响的潜力。我们的研究结果表明，对油菜授粉动物群的大部分支持来自于其他类型的花卉资源，而不是其本身。我们还发现杂草与开花作物一样支持油菜授粉。最后，我们表明生长在谷物田间的杂草对油菜授粉的支持有很大的贡献，超过了除油菜之外的其他花卉资源的贡献。我们的研究结果强调油菜授粉受益于耕地中存在的花卉资源，无论作物类型如何，包括那些不依赖传粉媒介授粉的作物。