Crop management affects pollinator attractiveness and visitation in oilseed rape

Research output: Contribution to journalArticle

Abstract

Ecological intensification of agriculture implies managing ecological processes to improve performance of agricultural systems. However, impacts on relevant ecological functions such as insect pollination from other crop management factors are poorly explored. Pest insects and crop resources such as water availability can directly affect crop yields, but it is unknown if there are indirect effects through effects on insect pollination. With a factorial experiment, we examined how irrigation and control of pollen beetles affected crop attractiveness and pollinator visitation in an open-pollinated spring oilseed rape cultivar. We studied how irrigation and pest control modified the production of flowers and nectar in oilseed rape, and if this in turn affected the flower-visitation of honey bees and bumble bees. Pest control increased the number of oilseed rape flowers by 69%, and the amount of nectar per flower with 36%, but for the latter only in non-irrigated plots. Furthermore, we found higher pollinator densities in plots with reduced pollen beetle densities. Pest control also reduced the number of non-legitimate flower visits, suggesting higher pollination efficiency in plots with reduced pollen beetle densities. We show that crop management affects the value of mass-flowering crops as a resource for pollinating insects. Development of pest control tools that are harmless to pollinators could increase the value of flowering crops as food resources for pollinating insects.

Details

Authors
Organisations
External organisations
  • Swedish University of Agricultural Sciences
  • Swedish Rural Economy and Agricultural Society
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Environmental Sciences related to Agriculture and Land-use
  • Ecology

Keywords

  • Apis mellifera, Bombus, Brassica napus, Crop pollination, Irrigation, Nectar, Pollen beetle, Sclerotinia
Original languageEnglish
Pages (from-to)82-88
JournalBasic and Applied Ecology
Volume26
Early online date2017 Sep 18
Publication statusPublished - 2018 Feb
Publication categoryResearch
Peer-reviewedYes