Contrasting effects of mass‐flowering crops on bee pollination of hedge plants at different spatial and temporal scales

Abstract

23Landscape-wide mass-flowering of oilseed rape (canola; Brassica napus) can considerably affect 24 wild bee communities and pollination success of wild plants. We aimed to assess the impact of 25 oilseed rape on the pollination of wild plants and bee abundance during and after oilseed-rape 26 bloom, including effects on crop-noncrop spillover at landscape and adjacent field scales. We 27 focused on two shrub species (hawthorn Crataegus spp., dog rose Rosa canina) and adjacent 28 herb flowering in forest edges, connected hedges and isolated hedges. We selected 35 landscape 29 circles of 1 km radius, differing in the amount of oilseed rape; 18 of which were adjacent to 30 oilseed rape and 17 to cereal fields, and we quantified bee density via pan traps at all sites. 31Adjacent oilseed rape positively affected fruit mass and seed number per fruit of simultaneously 32 flowering hawthorn (no effect on dog rose, which is flowering after the oilseed rape bloom). At

Some analytical and numerical approaches to understanding trap counts resulting from pest insect immigration

“…Contrary to similar problems in physics and chemistry, the width of this interface is often not small compared with the size of the habitat and may have its own structure (cf. Kovacs-Hostyanszki et al, 2013) and that makes application of standard techniques questionable. In fact, it is often not clear even where the exact position of the boundary is and/or what its exact shape is (cf.…”

Massively Introduced Managed Species and Their Consequences for Plant–Pollinator Interactions

“…It also renders plantpollinator interaction networks more resilient to changes in floral resources (Tiedeken and Stout, 2015) that are prevalent in MIMS-dominated communities. Indeed, Kovács-Hostyánszki et al (2013) underlined that resources provided by MFC are most beneficial for wild populations of bees and plants if seminatural habitats are available, providing continuous nesting and food resources during the season. In nonagricultural habitats, buffering the impacts of plant MIMS, be they ornamental or invasive, is also linked to the preservation of floral diversity (Blackmore and Goulson, 2014;Kaluza et al, 2016).…”

Intersection between biodiversity conservation, agroecology, and ecosystem services

“…Some studies suggest that some native plant species, for example, may benefit from the spillover of bees from agroecosystems into natural fragments (Hagen and Kraemer 2010;Tuell et al 2008), while others show that cultivated crops can compete for pollinators, especially during times of mass flowering of crops, thus reducing wild plant fitness in forest fragments (Aizen, Morales, and Morales 2008;Lander et al 2011). Kovacs-Hostyanszki et al (2013) study suggests that the strength and direction of the effect of mass-flowering crops on wild plant pollination services depend on the spatial and temporal scale considered and on the habitat type, the wild plant species, and the time of crop flowering. Similar situation could hold for pest-herbivore interactions in forest fragment as result of spillover from agricultural systems, but this remains largely understudied (Blitzer et al 2012).…”