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Related Experiment Video

Updated: Jan 9, 2026

Empirical, Metagenomic, and Computational Techniques Illuminate the Mechanisms by which Fungicides Compromise Bee Health
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Colony defence in bumblebees (Bombus terrestris).

Sajedeh Sarlak1, Divya Ramesh2, Ahmad Ashouri1

  • 1Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.

Plos One
|December 3, 2025
PubMed
Summary

Bumblebee colony defense involves a sequence of behaviors, from preparation and searching to warning signals and recovery. Understanding these responses is crucial for bumblebee conservation and managing managed colonies.

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Area of Science:

  • Ecology
  • Animal Behavior
  • Conservation Biology

Background:

  • Bumblebees (Bombus terrestris) are vital pollinators for ecosystems and agriculture.
  • Limited research exists on bumblebee colony defense mechanisms compared to foraging and reproduction.

Purpose of the Study:

  • To detail the defensive behaviors of Bombus terrestris colonies when disturbed.
  • To analyze the temporal sequence, location, and participation of bees during defense.
  • To investigate variations in defense based on disturbance type.

Main Methods:

  • Laboratory observation of whole bumblebee colonies.
  • Mechanical jolts and other disturbances to elicit defensive responses.
  • Ethogram development to classify and quantify behaviors.

Main Results:

  • A comprehensive ethogram of bumblebee defensive behaviors was created.
  • Identified a core set of responses common to all bees, with some random behaviors.
  • Defense strategies vary depending on the type of disturbance (mechanical, intruder, foreign object).

Conclusions:

  • Bumblebee colony defense is a multi-stage process involving preparation, threat assessment, signaling, and recovery.
  • This study provides a foundational understanding of bumblebee defensive behavior regulation.
  • Insights are critical for bumblebee conservation and the management of domesticated colonies.