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Related Experiment Video

Updated: May 23, 2025

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Urban bumblebees diversify their foraging strategy to maintain nutrient intake.

Simonetta Selva1,2, Marco Moretti3, Fabian A Ruedenauer4

  • 1Swiss Federal Institute for Forest Snow and Landscape Research, Birmensdorf, Switzerland.

Proceedings. Biological Sciences
|May 20, 2025
PubMed
Summary

Urban bumblebees (Bombus) forage more widely than rural bees, adapting their diet breadth to city floral diversity. Despite this, nutrient intake remains stable, though pollen transport patterns differ, highlighting urban ecosystem impacts on pollinators.

Keywords:
feeding behaviourintraspecific trait variabilityland-use changesplant–pollinator interactionspollinationurban biodiversity

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Area of Science:

  • Ecology
  • Urban Ecology
  • Pollinator Biology

Background:

  • Anthropogenic ecosystems, like urban environments, can significantly alter ecological processes, including species interactions and resource use.
  • Previous studies noted morphological variations in pollinators between urban and rural populations related to diet, but the impacts on diet breadth and pollen transport are not well understood.

Purpose of the Study:

  • To investigate how urban environments affect the diet breadth, nutrient intake, and pollen transport patterns of bumblebees.
  • To compare urban and rural populations of two bumblebee species to understand adaptation to anthropogenic landscapes.

Main Methods:

  • Comparative analysis of diet breadth in urban versus rural bumblebee individuals.
  • Assessment of nutrient intake and pollen transport patterns in both populations.
  • Focus on two specific bumblebee species to examine ecological responses.

Main Results:

  • Urban bumblebees demonstrated a broader diet breadth compared to rural bumblebees, linked to increased floral diversity in cities.
  • Nutrient intake levels were similar between urban and rural bumblebees, suggesting adaptive foraging strategies.
  • Pollen transport patterns differed significantly, with urban bumblebees showing greater dissimilarity in transported pollen.

Conclusions:

  • Bumblebees adapt their diet breadth in urban ecosystems to maintain nutrient intake, showcasing foraging flexibility.
  • Urbanization influences not only diet but also the specifics of pollen dispersal, with implications for plant reproduction.
  • Assessing the ecological effects of anthropogenic environments requires a comprehensive view of species' diets and interactions.