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Experimental evidence that honeybees depress wild insect densities in a flowering crop

Author:
  • Sandra A M Lindström
  • Lina Herbertsson
  • Maj Rundlöf
  • Riccardo Bommarco
  • Henrik G. Smith
Publishing year: 2016-11-30
Language: English
Publication/Series: Proceedings of the Royal Society B: Biological Sciences
Volume: 283
Issue: 1843
Document type: Journal article
Publisher: Royal Society

Abstract english

While addition of managed honeybees (Apis mellifera) improves pollination of many entomophilous crops, it is unknown if it simultaneously suppresses the densities of wild insects through competition. To investigate this, we added 624 honeybee hives to 23 fields of oilseed rape (Brassica napus L.) over 2 years and made sure that the areas around 21 other fields were free from honeybee hives. We demonstrate that honeybee addition depresses the densities of wild insects (bumblebees, solitary bees, hoverflies, marchflies, other flies, and other flying and flower-visiting insects) even in a massive flower resource such as oilseed rape. The effect was independent of the complexity of the surrounding landscape, but increased with the size of the crop field, which suggests that the effect was caused by spatial displacement of wild insects. Our results have potential implications both for the pollination of crops (if displacement of wild pollinators offsets benefits achieved by adding honeybees) and for conservation of wild insects (if displacement results in negative fitness consequences).

Keywords

  • Environmental Sciences related to Agriculture and Land-use
  • Ecology
  • Crop pollinators
  • Flies
  • Interspecific competition
  • Oilseed rape
  • Wild bees

Other

Published
  • ISSN: 0962-8452
Henrik Smith
E-mail: henrik.smith [at] biol.lu.se

Professor

Biodiversity

+46 46 222 93 79

+46 70 978 20 56

E-C313

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Director

Centre for Environmental and Climate Research (CEC)

+46 46 222 93 79

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Centre for Animal Movement Research
Evolutionary Ecology, Department of Biology
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