Sun Navigation Requires Compass Neurons in Drosophila

Area of Science:

• Neuroscience
• Animal Behavior
• Sensory Biology

Background:

• Insects navigate using visual landmarks, polarized light, and sun position.
• Drosophila exhibit remarkable long-distance navigation, requiring heading maintenance using celestial cues.
• The central complex in flies is implicated in integrating sensory information for navigation.

Purpose of the Study:

• To investigate sun-based navigation in Drosophila.
• To determine the role of E-PG neurons in the central complex as an internal compass.
• To understand how flies maintain headings relative to the sun.

Main Methods:

• Utilized a flight simulator to observe Drosophila's response to a simulated sun.
• Employed genetic tools to manipulate E-PG neuron activity in flying flies.
• Conducted imaging experiments to monitor E-PG cell activity during flight.

Main Results:

• Drosophila demonstrated menotaxis, adopting and maintaining arbitrary headings relative to a simulated sun.
• E-PG neurons were observed to track the motion of the sun stimulus.
• Silencing E-PG neurons resulted in a loss of menotaxis and a reversion to frontal phototaxis.

Conclusions:

• E-PG neurons function as an internal compass, enabling sun-based navigation (menotaxis) in Drosophila.
• The compass system is crucial for maintaining headings relative to celestial cues.
• Disruption of the compass system leads to a loss of complex navigation and a reliance on simpler behaviors.