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Wild bee species richness in crop fields is higher in margins than centers, but this diversity declines inward. Regional variations in bee activity and size impact conservation strategies for wild bee pollination.

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Area of Science:

  • Ecology
  • Pollination Biology
  • Conservation Science

Background:

  • Wild bees are crucial pollinators for crops, and their spatial distribution within fields influences pollination services.
  • Field margins offer essential nesting and foraging habitats for wild bees, potentially acting as a source of pollinators for adjacent crops.
  • Regional variations in pollinator communities can influence the effectiveness of wild bee spill-over into agricultural fields.

Purpose of the Study:

  • To investigate how regional and local factors influence the spatial distribution of wild bee species richness, activity-density, and body size within crop fields.
  • To assess the impact of semi-natural field margins (grass strips and hedges) on wild bee communities in strawberry fields across a North-South European gradient.

Main Methods:

  • Conducted bee sampling in the field center and two types of semi-natural margins (grass strips, hedges) across 12 strawberry fields.
  • The study spanned four regions in Northern Europe, covering an approximately 1100 km north-south gradient.
  • Analyzed differences in bee species richness, activity-density, and body size between field centers and margins, considering regional variations.

Main Results:

  • Wild bee species richness was consistently higher in field margins compared to field centers, irrespective of field size.
  • No significant differences were found in bee body size or activity-density between field centers and margins.
  • Bee activity-density showed a trend of increasing towards southern regions, while mean body size increased towards northern regions.

Conclusions:

  • A general pattern of declining wild bee diversity towards the field interior was observed across European regions, suggesting limited benefits from margin spill-over for crop pollination.
  • Dissimilar regional patterns in bee diversity and activity-density highlight the need for region-specific conservation management strategies for wild bees.
  • The findings indicate that enhancing pollination services through wild bee spill-over may be challenging due to the observed distribution patterns.