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Updated: Apr 25, 2026
A New Approach that Eliminates Handling for Studying Aggression and the "Loser" Effect in Drosophila melanogaster
Published on: December 30, 2015
How food controls aggression in Drosophila
Rod S Lim1, Eyrún Eyjólfsdóttir2, Euncheol Shin3
1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California, United States of America; Howard Hughes Medical Institute, California Institute of Technology, Pasadena, California, United States of America.
Food presence increases aggression in male fruit flies by activating sweet-sensing neurons. This aggression is linked to the amount of food, not just its availability, suggesting a direct sensory link to competition.
Area of Science:
- Behavioral neuroscience
- Animal behavior
- Sensory biology
Background:
- Animal decisions involve weighing risks and benefits of sensory information.
- Inter-male aggression is triggered by resources and competing males.
- The precise role of food in aggression, direct or indirect, is unclear.
Purpose of the Study:
- Investigate how food influences aggression in Drosophila melanogaster.
- Determine if food's effect on aggression is direct or a consequence of social interaction.
- Identify sensory pathways mediating food-induced aggression.
Main Methods:
- Behavioral assays in Drosophila melanogaster.
- Quantification of aggression levels under varying food conditions.
- Genetic manipulation of gustatory receptor neurons (GRNs).
Main Results:
- Food significantly promotes aggression in male flies, independent of social interaction frequency or activity levels.
- Aggression levels correlate with the absolute amount of food, with diminished aggression at very high levels.
- Detection of sugar via Gr5a+ gustatory receptor neurons is essential for food-promoted aggression.
Conclusions:
- Food directly promotes aggression in male flies through a specific sensory mechanism.
- Sweet-sensing GRNs play a crucial role in mediating the link between food and aggression.
- Competition dynamics are influenced by the quantity of available resources.
