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Land-use affects pollinator-specific resource availability and pollinator foraging behaviour.

Markus Birkenbach1, Florian Straub1, Anna Kiesel1

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Land-use intensity in grasslands impacts pollinator resources and foraging. High land-use intensity reduces flower diversity, affecting bumblebee foraging behavior and potentially contributing to pollinator decline.

Keywords:
anthropogenic influencebumblebeepollination servicespollinator‐plant interactionsyrphid fly

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Area of Science:

  • Ecology
  • Conservation Biology
  • Agricultural Science

Background:

  • Pollinator populations are declining globally, with land-use management in agricultural grasslands identified as a significant driver.
  • Land-use intensity can directly cause habitat loss and indirectly reduce floral resources, impacting pollinator health and foraging behavior.

Purpose of the Study:

  • To investigate how land-use intensity (LUI) affects pollinator resource availability, host plant selection, and foraging behavior in managed grasslands.
  • To compare the responses of bumblebees (Bombus lapidarius) and syrphid flies (Episyrphus balteatus) to varying LUI.

Main Methods:

  • Conducted surveys of flowering plant species abundance in grasslands with variable LUI.
  • Performed behavioral observations of bumblebees and syrphid flies.
  • Analyzed the relationship between LUI, floral resource availability, plant selection, and pollinator foraging patterns.

Main Results:

  • Floral resource composition depended on LUI and management practices (mowing, grazing).
  • Bumblebees, unlike syrphid flies, altered their plant selection based on LUI.
  • Reduced flower diversity and abundance due to LUI indirectly impacted pollinator behavior, with bumblebees exhibiting longer flight durations on intensive plots.

Conclusions:

  • Land-use management significantly alters floral resource availability and composition for pollinators in agricultural grasslands.
  • Varying LUI indirectly affects pollinator foraging behavior, with differential impacts on different pollinator groups.
  • These land-use-driven changes in resources and foraging behavior may contribute to pollinator declines.